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15 years of galactic surveys and hard X-ray background measurements New Astron. Rev. (IF 4.2) Pub Date : 2021-01-20 Roman A. Krivonos, Antony J. Bird, Eugene M. Churazov, John A. Tomsick, Angela Bazzano, Volker Beckmann, Guillaume Bélanger, Arash Bodaghee, Sylvain Chaty, Erik Kuulkers, Alexander Lutovinov, Angela Malizia, Nicola Masetti, Ilya A. Mereminskiy, Rashid Sunyaev, Sergey S. Tsygankov, Pietro Ubertini, Christoph Winkler
The INTEGRAL hard X-ray surveys have proven to be of fundamental importance. INTEGRAL has mapped the Galactic plane with its large field of view and excellent sensitivity. Such hard X-ray snapshots of the whole Milky Way on a time scale of a year are beyond the capabilities of past and current narrow-FOV grazing incidence X-ray telescopes. By expanding the INTEGRAL X-ray survey into shorter timescales
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Numerical simulations of jets New Astron. Rev. (IF 4.2) Pub Date : 2021-01-23 Serguei Komissarov, Oliver Porth
When astrophysical jets were discovered one hundred years ago, the field of numerical simulations did not yet exit. Since the arrival of programmable computers though, numerical simulations have increasingly become an indispensable tool for dealing with “tough nut” problems which involve complex dynamic and non-linear phenomena. Astrophysical jets are an ideal example of such a tough nut, where multi-scale
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Synthesis of radioactive elements in novae and supernovae and their use as a diagnostic tool New Astron. Rev. (IF 4.2) Pub Date : 2020-12-05 J. Isern, M. Hernanz, E. Bravo, S. Grebenev, P. Jean, M. Renaud, T. Siegert, J. Vink
Novae and supernovae play a key role in many fields of Astrophysics and Cosmology. Despite their importance, an accurate description of which objects explode and why and how they explode is still lacking. One of the main characteristics of such explosions is that they are the main suppliers of newly synthesized chemical elements in the Galaxy. Since some of these isotopes are radioactive, it is possible
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Steady-state nucleosynthesis throughout the Galaxy New Astron. Rev. (IF 4.2) Pub Date : 2020-12-24 Roland Diehl, Martin G.H. Krause, Karsten Kretschmer, Michael Lang, Moritz M.M. Pleintinger, Thomas Siegert, Wei Wang, Laurent Bouchet, Pierrick Martin
The measurement and astrophysical interpretation of characteristic γ-ray lines from nucleosynthesis was one of the prominent science goals of the INTEGRAL mission and in particular its spectrometer SPI. Emission from 26Al and from 60Fe decay lines, due to their My decay times, originates from accumulated ejecta of nucleosynthesis sources, and appears diffuse in nature. 26Al and 60Fe are believed to
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Multi-messenger astronomy with INTEGRAL New Astron. Rev. (IF 4.2) Pub Date : 2020-12-07 Carlo Ferrigno, Volodymyr Savchenko, Alexis Coleiro, Francesca Panessa, Angela Bazzano, Enrico Bozzo, Jérôme Chenevez, Albert Domingo, Maeve Doyle, Andrea Goldwurm, Diego Götz, Elisabeth Jourdain, Andreas von Kienlin, Erik Kuulkers, Sandro Mereghetti, Antonio Martin-Carrillo, Lorenzo Natalucci, Francesca Onori, Pietro Ubertini
At the time of defining the science objectives of the INTernational Gamma-Ray Astrophysics Laboratory (INTEGRAL), such a rapid and spectacular development of multi-messenger astronomy could not have been predicted, with new impulsive phenomena becoming accessible through different channels. Neutrino telescopes have routinely detected energetic neutrino events coming from unknown cosmic sources since
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Critical review of chirality indicators of extraterrestrial life New Astron. Rev. (IF 4.2) Pub Date : 2020-11-26 David Avnir
The major revolution in modern astronomy recognizing the universe as teeming with exoplanets, the discovery of liquid water in solar moons, and the continuing focus on Mars exploration, all accelerate the re-evaluation of potential biomarkers for extraterrestrial life. Based on life on planet Earth which relies heavily on chiral molecules and especially on homochiral families, the detection of molecules
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INTEGRAL View on cataclysmic variables and symbiotic binaries New Astron. Rev. (IF 4.2) Pub Date : 2020-11-23 Alexander Lutovinov, Valery Suleimanov, Gerardo Juan Manuel Luna, Sergey Sazonov, Domitilla de Martino, Lorenzo Ducci, Victor Doroshenko, Maurizio Falanga
Accreting white dwarfs (WDs) constitute a significant fraction of the hard X-ray sources detected by the INTEGRAL observatory. Most of them are magnetic Cataclysmic Variables (CVs) of the intermediate polar (IP) and polar types, but the contribution of the Nova-likes systems and the systems with optically thin boundary layers, Dwarf Novae (DNs) and Symbiotic Binaries (or Symbiotic Stars, SySs) in quiescence
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OB Associations and their origins New Astron. Rev. (IF 4.2) Pub Date : 2020-11-03 Nicholas J. Wright
OB associations are unbound groups of young stars made prominent by their bright OB members, and have long been thought to be the expanded remnants of dense star clusters. They have been important in astrophysics for over a century thanks to their luminous massive stars, though their low-mass members have not been well studied until the last couple of decades. This has changed thanks to data from X-ray
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INTEGRAL view of AGN New Astron. Rev. (IF 4.2) Pub Date : 2020-10-22 Angela Malizia, Sergey Sazonov, Loredana Bassani, Elena Pian, Volker Beckmann, Manuela Molina, Ilya Mereminskiy, Guillaume Belanger
AGN are among the most energetic phenomena in the Universe and in the last two decades INTEGRAL’s contribution in their study has had a significant impact. Thanks to the INTEGRAL extragalactic sky surveys, all classes of soft X-ray detected (in the 2-10 keV band) AGN have been observed at higher energies as well. Up to now, around 450 AGN have been catalogued and a conspicuous part of them are either
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INTEGRAL results on the electron-positron annihilation radiation and X-ray & Gamma-ray diffuse emission of the Milky Way New Astron. Rev. (IF 4.2) Pub Date : 2020-09-22 Eugene Churazov, Laurent Bouchet, Pierre Jean, Elisabeth Jourdain, Jürgen Knödlseder, Roman Krivonos, Jean-Pierre Roques, Sergey Sazonov, Thomas Siegert, Andrew Strong, Rashid Sunyaev
This review summarizes INTEGRAL results on two topics: the electron-positron annihilation line and X-ray & Gamma-ray diffuse emission of the Milky Way. The electron-positron annihilation line at 511 keV is the most prominent spectral feature in the gamma-ray spectrum of the Milky Way. From the observational perspective, INTEGRAL has already provided constraints on the total flux, morphology of the
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Advances in Understanding High-Mass X-ray Binaries with INTEGRALand Future Directions New Astron. Rev. (IF 4.2) Pub Date : 2020-09-09 Peter Kretschmar, Felix Fürst, Lara Sidoli, Enrico Bozzo, Julia Alfonso-Garzón, Arash Bodaghee, Sylvain Chaty, Masha Chernyakova, Carlo Ferrigno, Antonios Manousakis, Ignacio Negueruela, Konstantin Postnov, Adamantia Paizis, Pablo Reig, José Joaquín Rodes-Roca, Sergey Tsygankov, Antony J. Bird, Matthias Bissinger né Kühnel, Shu Zhang
High mass X-ray binaries are among the brightest X-ray sources in the Milky Way, as well as in nearby Galaxies. Thanks to their highly variable emissions and complex phenomenology, they have attracted the interest of the high energy astrophysical community since the dawn of X-ray Astronomy. In more recent years, they have challenged our comprehension of physical processes in many more energy bands
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The INTEGRAL view of the pulsating hard X-ray sky: from accreting and transitional millisecond pulsars to rotation-powered pulsars and magnetars New Astron. Rev. (IF 4.2) Pub Date : 2020-08-28 A. Papitto, M. Falanga, W. Hermsen, S. Mereghetti, L. Kuiper, J. Poutanen, E. Bozzo, F. Ambrosino, F. Coti Zelati, V. De Falco, D. de Martino, T. Di Salvo, P. Esposito, C. Ferrigno, M. Forot, D. Götz, C. Gouiffes, R. Iaria, D.F. Torres
In the last 25 years a new generation of X-ray satellites imparted a significant leap forward in our knowledge of X-ray pulsars. The discovery of accreting and transitional millisecond pulsars proved that disk accretion can spin up a neutron star to a very high rotation speed. The detection of MeV-GeV pulsed emission from a few hundreds of rotation-powered pulsars probed particle acceleration in the
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INTEGRAL results on gamma-ray bursts and polarization of hard X-ray sources New Astron. Rev. (IF 4.2) Pub Date : 2020-08-25 Diego Götz, Christian Gouiffès, Jérôme Rodriguez, Philippe Laurent, Elisabeth Jourdain, Jean-Pierre Roques, Sandro Mereghetti, Alexander Lutovinov, Volodymyr Savchenko, Lorraine Hanlon, Antonio Martin-Carrillo, Paul Moran
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Relativistic Jets of Blazars New Astron. Rev. (IF 4.2) Pub Date : 2020-08-12 Talvikki Hovatta, Elina Lindfors
Relativistic jets of active galactic nuclei have been known to exist for 100 years. Blazars with their jet pointing close to our line of sight are some of the most variable and extreme objects in the universe, showing emission from radio to very-high-energy gamma rays. In this review, we cover relativistic jets of blazars from an observational perspective with the main goal of discussing how observations
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The Galactic LMXB Population and the Galactic Centre Region New Astron. Rev. (IF 4.2) Pub Date : 2020-08-12 S. Sazonov, A. Paizis, A. Bazzano, I. Chelovekov, I. Khabibullin, K. Postnov, I. Mereminskiy, M. Fiocchi, G. Bélanger, A.J. Bird, E. Bozzo, J. Chenevez, M. Del Santo, M. Falanga, R. Farinelli, C. Ferrigno, S. Grebenev, R. Krivonos, J. Wilms
Seventeen years of hard X-ray observations with the instruments of the INTEGRAL observatory, with a focus on the Milky Way and in particular on the Galactic Centre region, have provided a unique database for exploration of the Galactic population of low-mass X-ray binaries (LMXBs). Our understanding of the diverse energetic phenomena associated with accretion of matter onto neutron stars and black
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Particle acceleration in astrophysical jets New Astron. Rev. (IF 4.2) Pub Date : 2020-07-31 James H. Matthews, Anthony R. Bell, Katherine M. Blundell
In this chapter, we review some features of particle acceleration in astrophysical jets. We begin by describing four observational results relating to the topic, with particular emphasis on jets in active galactic nuclei and parallels between different sources. We then discuss the ways in which particles can be accelerated to high energies in magnetised plasmas, focusing mainly on shock acceleration
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The case for jets in cataclysmic variables New Astron. Rev. (IF 4.2) Pub Date : 2020-07-31 Deanne L. Coppejans, Christian Knigge
For decades cataclysmic variables (CVs) were thought to be one of the few classes of accreting compact objects to not launch jets, and have consequently been used to constrain jet launching models. However, recent theoretical and observational advances indicate that CVs do in fact launch jets. Specifically, it was demonstrated that their accretion-outflow cycle is analogous to that of their higher
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Radio galaxies and feedback from AGN jets New Astron. Rev. (IF 4.2) Pub Date : 2020-07-31 M.J. Hardcastle, J.H. Croston
We review current understanding of the population of radio galaxies and radio-loud quasars from an observational perspective, focusing on their large-scale structures and dynamics. We discuss the physical conditions in radio galaxies, their fuelling and accretion modes, host galaxies and large-scale environments, and the role(s) they play as engines of feedback in the process of galaxy evolution. Finally
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SS433: A massive X-ray binary in an advanced evolutionary stage New Astron. Rev. (IF 4.2) Pub Date : 2020-07-31 Anatol Cherepashchuk, Konstantin Postnov, Sergey Molkov, Eleonora Antokhina, Alexander Belinski
INTEGRAL IBIS/ISGRI 18–60 keV observations of SS433 performed in 2003–2011 enabled for the first time the hard X-ray phase-resolved orbital and precessional light curves and spectra to be constructed. The spectra can be fitted by a power-law with photon index ≃ 3.8 and remain almost constant while the X-ray flux varies by a factor of a few. This suggests that the hard X-ray emission in SS433 is produced
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Jets from Tidal Disruption Events New Astron. Rev. (IF 4.2) Pub Date : 2020-07-31 Fabio De Colle, Wenbin Lu
The discovery of jets from tidal disruption events (TDEs) rejuvenated the old field of relativistic jets powered by accretion onto supermassive black holes. In this Chapter, we first review the extensive multi-wavelength observations of jetted TDEs. Then, we show that these events provide valuable information on many aspects of jet physics from a new prospective, including the on-and-off switch of
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Supernovae Ia in 2019 (review): A rising demand for spherical explosions New Astron. Rev. (IF 4.2) Pub Date : 2020-05-25 Noam Soker
I review new studies of type Ia supernovae (SNe Ia) from 2019, and use these to improve the comparison between the five binary SN Ia scenarios. New low polarisation measurements solidify the claim that most SN Ia explosions are globally spherically symmetric (clumps are possible). Explosions by dynamical processes, like explosions that take place during a merger process of two white dwarfs (WDs) in
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Energy-sensitive detectors for astronomy: Past, present and future New Astron. Rev. (IF 4.2) Pub Date : 2020-02-27 E.G.P. O’Connor, A. Shearer, K. O’Brien
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A review of quasi-periodic oscillations from black hole X-ray binaries: Observation and theory New Astron. Rev. (IF 4.2) Pub Date : 2020-02-14 Adam R. Ingram, Sara E. Motta
Black hole and neutron star X-ray binary systems routinely show quasi-periodic oscillations (QPOs) in their X-ray flux. Despite being strong, easily measurable signals, their physical origin has long remained elusive. However, recent observational and theoretical work has greatly improved our understanding. Here, we briefly review the basic phenomenology of the different varieties of QPO in both black
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The quest for dual and binary supermassive black holes: A multi-messenger view New Astron. Rev. (IF 4.2) Pub Date : 2020-02-11 Alessandra De Rosa, Cristian Vignali, Tamara Bogdanović, Pedro R. Capelo, Maria Charisi, Massimo Dotti, Bernd Husemann, Elisabeta Lusso, Lucio Mayer, Zsolt Paragi, Jessie Runnoe, Alberto Sesana, Lisa Steinborn, Stefano Bianchi, Monica Colpi, Luciano del Valle, Sándor Frey, Krisztina É. Gabányi, Marta Volonteri
The quest for binary and dual supermassive black holes (SMBHs) at the dawn of the multi-messenger era is compelling. Detecting dual active galactic nuclei (AGN) – active SMBHs at projected separations larger than several parsecs – and binary AGN – probing the scale where SMBHs are bound in a Keplerian binary – is an observational challenge. The study of AGN pairs (either dual or binary) also represents
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Surviving companions of Type Ia supernovae: theory and observations New Astron. Rev. (IF 4.2) Pub Date : 2019-12-17 Pilar Ruiz–Lapuente
We review the theoretical background and the observational searches made for surviving companions of Type Ia supernovae (SNe Ia). Theory comprises the characteristics of the stellar binary companions of the exploding white dwarfs at the time of the supernova outburst and the expected effects on them of the explosion, as well as their subsequent evolution. That includes space velocities, rotation, luminosities
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How to find a planet from transit variations New Astron. Rev. (IF 4.2) Pub Date : 2019-07-01 David Nesvorný
Here we describe the story behind the discovery of Kepler-46, which was the first exoplanetary system detected and characterized from a method known as the transit timing variations (TTVs). The TTV method relies on the gravitational interaction between planets orbiting the same star. If transits of at least one of the planets are detected, precise measurements of its transit times can be used, at least
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Kepler-9: The first multi-transiting system and the first transit timing variations New Astron. Rev. (IF 4.2) Pub Date : 2019-05-13 Darin Ragozzine, Matthew J. Holman
Kepler-9, discovered by Holman et al. (2010), was the first system with multiple confirmed transiting planets and the first system to clearly show long-anticipated transit timing variations (TTVs). It was the first major novel exoplanet discovery of the Kepler Space Telescope mission. The Kepler pipeline identified two Saturn-radius candidates (called Kepler Objects of Interest or KOIs): KOI-377.01
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Discovery of the first Earth-sized planets orbiting a star other than our Sun in the Kepler-20 system New Astron. Rev. (IF 4.2) Pub Date : 2019-05-13 Guillermo Torres, François Fressin
Discovering other worlds the size of our own has been a long-held dream of astronomers. The transiting planets Kepler-20 e and Kepler-20 f, which belong to a multi-planet system, hold a very special place among the many groundbreaking discoveries of the Kepler mission because they finally realized that dream. The radius of Kepler-20 f is essentially identical to that of the Earth, while Kepler-20 e
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Discovery and characterization of Kepler-36b New Astron. Rev. (IF 4.2) Pub Date : 2019-05-13 Eric Agol, Joshua A. Carter
We describe the circumstances that led to the discovery of Kepler-36b, and the subsequent characterization of its host planetary system. The Kepler-36 system is remarkable for its physical properties: the close separation of the planets, the contrasting densities of the planets despite their proximity, and the short chaotic timescale. Its discovery and characterization was also remarkable for the novelty
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Kepler-62f: Kepler's first small planet in the habitable zone, but is it real? New Astron. Rev. (IF 4.2) Pub Date : 2019-05-13 William Borucki, Susan E. Thompson, Eric Agol, Christina Hedges
Kepler-62f is the first exoplanet small enough to plausibly have a rocky composition orbiting within the habitable zone (HZ) discovered by the Kepler Mission. The planet is 1.4 times the size of the Earth and has an orbital period of 267 days. At the time of its discovery, it had the longest period of any small planet in the habitable zone of a multi-planet system. Because of its long period, only
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Kepler-78 and the Ultra-Short-Period planets New Astron. Rev. (IF 4.2) Pub Date : 2019-05-13 Joshua N. Winn, Roberto Sanchis-Ojeda, Saul Rappaport
Compared to the Earth, the exoplanet Kepler-78b has a similar size (1.2 R⊕) and an orbital period a thousand times shorter (8.5 h). It is currently the smallest planet for which the mass, radius, and dayside brightness have all been measured. Kepler-78b is an exemplar of the ultra-short-period (USP) planets, a category defined by the simple criterion Porb < 1 day. We describe our Fourier-based search
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The discovery and legacy of Kepler’s multi-transiting planetary systems New Astron. Rev. (IF 4.2) Pub Date : 2019-05-10 Jason H. Steffen, Jack J. Lissauer
We revisit the discovery and implications of the first candidate systems to contain multiple transiting exoplanets. These systems were discovered using data from the Kepler space telescope. The initial paper, presenting five systems (Steffen et al., 2010a), was posted online at the time the project released the first catalog of Kepler planet candidates. The first extensive analysis of the observed
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The discovery of “Tatooine”: Kepler-16b New Astron. Rev. (IF 4.2) Pub Date : 2019-05-08 Laurance R. Doyle
We describe the discovery of Kepler-16b, the first widely accepted detection of a circumbinary planet.
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Synthetic observations of star formation and the interstellar medium New Astron. Rev. (IF 4.2) Pub Date : 2018-06-30 Thomas J. Haworth, Simon C.O. Glover, Christine M. Koepferl, Thomas G. Bisbas, James E. Dale
Synthetic observations are playing an increasingly important role across astrophysics, both for interpreting real observations and also for making meaningful predictions from models. In this review, we provide an overview of methods and tools used for generating, manipulating and analysing synthetic observations and their application to problems involving star formation and the interstellar medium
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The terrestrial record of Late Heavy Bombardment New Astron. Rev. (IF 4.2) Pub Date : 2018-03-26 Donald R. Lowe, Gary R. Byerly
Until recently, the known impact record of the early Solar System lay exclusively on the surfaces of the Moon, Mars, and other bodies where it has not been erased by later weathering, erosion, impact gardening, and/or tectonism. Study of the cratered surfaces of these bodies led to the concept of the Late Heavy Bombardment (LHB), an interval from about 4.1 to 3.8 billion years ago (Ga) during which
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Star clusters in evolving galaxies New Astron. Rev. (IF 4.2) Pub Date : 2018-03-22 Florent Renaud
Their ubiquity and extreme densities make star clusters probes of prime importance of galaxy evolution. Old globular clusters keep imprints of the physical conditions of their assembly in the early Universe, and younger stellar objects, observationally resolved, tell us about the mechanisms at stake in their formation. Yet, we still do not understand the diversity involved: why is star cluster formation
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The State-of-Play of Anomalous Microwave Emission (AME) research New Astron. Rev. (IF 4.2) Pub Date : 2018-02-23 Clive Dickinson, Y. Ali-Haïmoud, A. Barr, E.S. Battistelli, A. Bell, L. Bernstein, S. Casassus, K. Cleary, B.T. Draine, R. Génova-Santos, S.E. Harper, B. Hensley, J. Hill-Valler, Thiem Hoang, F.P. Israel, L. Jew, A. Lazarian, J.P. Leahy, Matias Vidal
Anomalous Microwave Emission (AME) is a component of diffuse Galactic radiation observed at frequencies in the range ≈ 10–60 GHz. AME was first detected in 1996 and recognised as an additional component of emission in 1997. Since then, AME has been observed by a range of experiments and in a variety of environments. AME is spatially correlated with far-IR thermal dust emission but cannot be explained
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The science case for simultaneous mm-wavelength receivers in radio astronomy New Astron. Rev. (IF 4.2) Pub Date : 2017-09-19 Richard Dodson, María J. Rioja, Taehyun Jung, José L. Goméz, Valentin Bujarrabal, Luca Moscadelli, James C.A. Miller-Jones, Alexandra J. Tetarenko, Gregory R. Sivakoff
This review arose from the European Radio Astronomy Technical Forum (ERATec) meeting held in Firenze, October 2015, and aims to highlight the breadth and depth of the high-impact science that will be aided and assisted by the use of simultaneous mm-wavelength receivers. Recent results and opportunities are presented and discussed from the fields of: continuum VLBI (observations of weak sources, astrometry
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The Chandra deep fields: Lifting the veil on distant active galactic nuclei and X-ray emitting galaxies New Astron. Rev. (IF 4.2) Pub Date : 2017-09-18 Y.Q. Xue
The Chandra Deep Fields (CDFs), being a major thrust among extragalactic X-ray surveys and complemented effectively by multiwavelength observations, have critically contributed to our dramatically improved characterization of the 0.5–8 keV cosmic X-ray background sources, the vast majority of which are distant active galactic nuclei (AGNs) and starburst and normal galaxies. In this review, I highlight
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Constraining the pitch angle of the galactic spiral arms in the Milky Way New Astron. Rev. (IF 4.2) Pub Date : 2017-09-07 Jacques P. Vallée
We carry out analyses of some parameters of the galactic spiral arms, in the currently available samples. We present a catalog of the observed pitch angle for each spiral arm in the Milky Way disk. For each long spiral arm in the Milky Way, we investigate for each individual arm its pitch angle, as measured through different methods (parallaxes, twin-tangent arm, kinematical, etc), and assess their
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Neutrino-dominated accretion flows as the central engine of gamma-ray bursts New Astron. Rev. (IF 4.2) Pub Date : 2017-07-20 Tong Liu, Wei-Min Gu, Bing Zhang
Neutrino-dominated accretion flows (NDAFs) around rotating stellar-mass black holes (BHs) are plausible candidates for the central engines of gamma-ray bursts (GRBs). NDAFs are hyperaccretion disks with accretion rates in the range of around 0.001–10 M⊙s−1, which have high density and temperature and therefore are extremely optically thick and geometrically slim or even thick. We review the theoretical
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Active galactic nuclei horizons from the gamma-ray perspective New Astron. Rev. (IF 4.2) Pub Date : 2017-06-15 Andrew M. Taylor
Recent results in the field of high energy active galactic nuclei (AGN) astrophysics, benefiting from improvements to gamma-ray instruments and observational strategies, have revealed a surprising wealth of unexpected phenomena. These developments have been brought about both through observational efforts to discover new very high energy gamma-ray emitters, as well as from further in-depth observations
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The formation of stellar black holes New Astron. Rev. (IF 4.2) Pub Date : 2017-04-20 Félix Mirabel
It is believed that stellar black holes (BHs) can be formed in two different ways: Either a massive star collapses directly into a BH without a supernova (SN) explosion, or an explosion occurs in a proto-neutron star, but the energy is too low to completely unbind the stellar envelope, and a large fraction of it falls back onto the short-lived neutron star (NS), leading to the delayed formation of
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Gamma Ray Burst afterglow and prompt-afterglow relations: An overview New Astron. Rev. (IF 4.2) Pub Date : 2017-04-08 M.G. Dainotti, R. Del Vecchio
The mechanism responsible for the afterglow emission of Gamma Ray Bursts (GRBs) and its connection to the prompt γ-ray emission is still a debated issue. Relations between intrinsic properties of the prompt or afterglow emission can help to discriminate between plausible theoretical models of GRB production. Here we present an overview of the afterglow and prompt-afterglow two parameter relations,
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The carriers of the unidentified infrared emission features: Clues from polycyclic aromatic hydrocarbons with aliphatic sidegroups New Astron. Rev. (IF 4.2) Pub Date : 2017-01-14 X.J. Yang, R. Glaser, Aigen Li, J.X. Zhong
The unidentified infrared emission (UIE) features at 3.3, 6.2, 7.7, 8.6, 11.3 and 12.7 µ m are ubiquitously seen in a wide variety of astrophysical regions in the Milky Way and nearby galaxies as well as distant galaxies at redshifts z ≳ 4. The UIE features are characteristic of the stretching and bending vibrations of aromatic hydrocarbon materials. The 3.3 µ m feature which results from the C–H stretching
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High energy polarimetry of prompt GRB emission New Astron. Rev. (IF 4.2) Pub Date : 2016-11-29 Mark L. McConnell
[Evidence] of polarized γ-ray emission (> 50 keV) from Gamma-Ray Bursts (GRBs) has been accumulated in recent years. Measurements have been reported with levels in the range of 30–80%, typically with limited statistical significance. No clear picture has yet emerged with regards to the polarization properties of GRBs. Taken at face value, the data suggest that most GRBs have a relatively large level
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The jet feedback mechanism (JFM) in stars, galaxies and clusters New Astron. Rev. (IF 4.2) Pub Date : 2016-08-24 Noam Soker
I review the influence jets and the bubbles they inflate might have on their ambient gas as they operate through a negative jet feedback mechanism (JFM). I discuss astrophysical systems where jets are observed to influence the ambient gas, in many cases by inflating large, hot, and low-density bubbles, and systems where the operation of the JFM is still a theoretical suggestion. The first group includes
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The white dwarf luminosity function New Astron. Rev. (IF 4.2) Pub Date : 2016-08-05 Enrique García–Berro, Terry D. Oswalt
White dwarfs are the final remnants of low- and intermediate-mass stars. Their evolution is essentially a cooling process that lasts for ∼ 10 Gyr. Their observed properties provide information about the history of the Galaxy, its dark matter content and a host of other interesting astrophysical problems. Examples of these include an independent determination of the past history of the local star formation
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The secondary supernova machine: Gravitational compression, stored Coulomb energy, and SNII displays New Astron. Rev. (IF 4.2) Pub Date : 2016-03-18 Donald D. Clayton, Bradley S. Meyer
Radioactive power for several delayed optical displays of core-collapse supernovae is commonly described as having been provided by decays of 56Ni nuclei. This review analyses the provenance of that energy more deeply: the form in which that energy is stored; what mechanical work causes its storage; what conservation laws demand that it be stored; and why its release is fortuitously delayed for about
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Circumstellar debris and pollution at white dwarf stars New Astron. Rev. (IF 4.2) Pub Date : 2016-03-12 J. Farihi
Circumstellar disks of planetary debris are now known or suspected to closely orbit hundreds of white dwarf stars. To date, both data and theory support disks that are entirely contained within the preceding giant stellar radii, and hence must have been produced during the white dwarf phase. This picture is strengthened by the signature of material falling onto the pristine stellar surfaces; disks
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A critical review of period analyses and implications for mass exchange in W UMa eclipsing binaries: Paper 3 New Astron. Rev. (IF 4.2) Pub Date : 2016-02-20 R.H. Nelson, D. Terrell, E.F. Milone
This is the third of a series of four papers, the goal of which is to identify the overcontact eclipsing binary star systems for which a solid case can be made for mass exchange. To reach this goal, it is necessary first to identify those systems for which there is a strong case for period change. We have identified 60 candidate systems; in the first two papers (Nelson et al., 2014, Nelson et al.,
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