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  • Murchison Widefield Array detection of steep-spectrum, diffuse, non-thermal radio emission within Abell 1127
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-09-11
    S. W. Duchesne; M. Johnston-Hollitt; Z. Zhu; R. B. Wayth; J. L. B. Line

    Diffuse, non-thermal emission in galaxy clusters is increasingly being detected in low-frequency radio surveys and images. We present a new diffuse, steep-spectrum, non-thermal radio source within the cluster Abell 1127 found in survey data from the Murchison Widefield Array (MWA). We perform follow-up observations with the ‘extended’ configuration MWA Phase II with improved resolution to better resolve

    更新日期:2020-09-11
  • A SETI survey of the Vela region using the Murchison Widefield Array: Orders of magnitude expansion in search space
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-09-07
    C. D. Tremblay; S. J. Tingay

    Following the results of our previous low-frequency searches for extraterrestrial intelligence (SETI) using the Murchison Widefield Array (MWA), directed towards the Galactic Centre and the Orion Molecular Cloud (Galactic Anticentre), we report a new large-scale survey towards the Vela region with the lowest upper limits thus far obtained with the MWA. Using the MWA in the frequency range 98–128 MHz

    更新日期:2020-09-09
  • An introduction to Bayesian inference in gravitational-wave astronomy: parameter estimation, model selection, and hierarchical models—Corrigendum
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-09-02
    Eric Thrane; Colm Talbot

    This is an introduction to Bayesian inference with a focus on hierarchical models and hyper-parameters. We write primarily for an audience of Bayesian novices, but we hope to provide useful insights for seasoned veterans as well. Examples are drawn from gravitational-wave astronomy, though we endeavour for the presentation to be understandable to a broader audience. We begin with a review of the fundamentals:

    更新日期:2020-09-02
  • MWA tied-array processing III: Microsecond time resolution via a polyphase synthesis filter
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-08-24
    S. J. McSweeney; S. M. Ord; D. Kaur; N. D. R. Bhat; B. W. Meyers; S. E. Tremblay; J. Jones; B. Crosse; K. R. Smith

    A new high time resolution observing mode for the Murchison Widefield Array (MWA) is described, enabling full polarimetric observations with up to $30.72\,$ MHz of bandwidth and a time resolution of ${\sim}$ $0.8\,\upmu$ s. This mode makes use of a polyphase synthesis filter to ‘undo’ the polyphase analysis filter stage of the standard MWA’s Voltage Capture System observing mode. Sources of potential

    更新日期:2020-08-24
  • Low(er) frequency follow-up of 28 candidate, large-scale synchrotron sources
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-08-20
    Torrance Hodgson; Melanie Johnston-Hollitt; Benjamin McKinley; Tessa Vernstrom; Valentina Vacca

    We follow up on a report by Vacca et al. (2018) of 28 candidate large-scale diffuse synchrotron sources in an 8° × 8° area of the sky (centred at RA 5h0m0s; Dec 5°48ʹ00ʹʹ). These sources were originally observed at 1.4 GHz using a combination of the single-dish Sardinia Radio Telescope and archival NRAO VLA Sky Survey data. They are in an area with nine massive galaxy clusters at $z \approx 0.1$ and

    更新日期:2020-08-20
  • Can an infinitely long object fit in an expanding universe?
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-08-20
    Aaron Glanville; Tamara M. Davis

    Does space stretch its contents as the universe expands? Usually, we say the answer is no—the stretching of space is not like the stretching of a rubber sheet that might drag things with it. In this paper, we explore a potential counterexample—namely, we show that it is impossible to make an arbitrarily long object in an expanding universe, because it is impossible to hold the distant end of the object

    更新日期:2020-08-20
  • Investigation on the mass transferring near-contact binary TT Cet
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-08-18
    Xiao-Man Tian; Lin-Feng Chang

    First multi-colour complete light curves and low-resolution spectra of short-period eclipsing binary TT Cet are presented. The stellar atmospheric parameters of the primary star were derived through spectra fitting as: $T_{eff}=7\,091\pm124\,{\text{K}}$ , $\log g = 4.15\pm0.33\,{\text{cm}}/\text{s}^2$ , and $[Fe/H]=-0.23\pm0.04\,\text{dex}$ . The light curves were analysed using the Wilson–Devinney

    更新日期:2020-08-18
  • The POlarised GLEAM Survey (POGS) II: Results from an all-sky rotation measure synthesis survey at long wavelengths
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-07-17
    C. J. Riseley; T. J. Galvin; C. Sobey; T. Vernstrom; S. V. White; X. Zhang; B. M. Gaensler; G. Heald; C. S. Anderson; T. M. O. Franzen; P. J. Hancock; N. Hurley-Walker; E. Lenc; C. L. Van Eck

    The low-frequency linearly polarised radio source population is largely unexplored. However, a renaissance in low-frequency polarimetry has been enabled by pathfinder and precursor instruments for the Square Kilometre Array. In this second paper from the POlarised GaLactic and Extragalactic All-Sky MWA Survey-the POlarised GLEAM Survey, or POGS-we present the results from our all-sky MWA Phase I Faraday

    更新日期:2020-07-17
  • The GLEAMing of the first supermassive black holes
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-07-16
    Guillaume Drouart; Nick Seymour; Tim J. Galvin; Jose Afonso; Joseph R. Callingham; Carlos De Breuck; Melanie Johnston-Hollitt; Anna D. Kapińska; Matthew D. Lehnert; Joël Vernet

    We present the results of a new selection technique to identify powerful ( $L_{\rm 500\,MHz} \gt 10^{27}\,\text{WHz}^{-1}$ ) radio galaxies towards the end of the Epoch of Reionisation. Our method is based on the selection of bright radio sources showing radio spectral curvature at the lowest frequency ( ${\sim}100\,\text{MHz}$ ) combined with the traditional faintness in K-band for high-redshift galaxies

    更新日期:2020-07-16
  • Modelling and peeling extended sources with shapelets: A Fornax A case study
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-07-16
    J. L. B. Line; D. A. Mitchell; B. Pindor; J. L. Riding; B. McKinley; R. L. Webster; C. M. Trott; N. Hurley-Walker; A. R. Offringa

    To make a power spectrum (PS) detection of the 21-cm signal from the Epoch of Reionisation (EoR), one must avoid/subtract bright foreground sources. Sources such as Fornax A present a modelling challenge due to spatial structures spanning from arc seconds up to a degree. We compare modelling with multi-scale (MS) CLEAN components to ‘shapelets’, an alternative set of basis functions. We introduce a

    更新日期:2020-07-16
  • The MeerKAT telescope as a pulsar facility: System verification and early science results from MeerTime
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-07-15
    M. Bailes; A. Jameson; F. Abbate; E. D. Barr; N. D. R. Bhat; L. Bondonneau; M. Burgay; S. J. Buchner; F. Camilo; D. J. Champion; I. Cognard; P. B. Demorest; P. C. C. Freire; T. Gautam; M. Geyer; J.-M. Griessmeier; L. Guillemot; H. Hu; F. Jankowski; S. Johnston; A. Karastergiou; R. Karuppusamy; D. Kaur; M. J. Keith; M. Kramer; J. van Leeuwen; M. E. Lower; Y. Maan; M. A. McLaughlin; B. W. Meyers; S.

    We describe system verification tests and early science results from the pulsar processor (PTUSE) developed for the newly commissioned 64-dish SARAO MeerKAT radio telescope in South Africa. MeerKAT is a high-gain ( ${\sim}2.8\,\mbox{K Jy}^{-1}$ ) low-system temperature ( ${\sim}18\,\mbox{K at }20\,\mbox{cm}$ ) radio array that currently operates at 580–1 670 MHz and can produce tied-array beams suitable

    更新日期:2020-07-15
  • Megahertz emission of massive early-type stars in the Cygnus region
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-07-15
    P. Benaglia; M. De Becker; C. H. Ishwara-Chandra; H. T. Intema; N. L. Isequilla

    Massive, early-type stars have been detected as radio sources for many decades. Their thermal winds radiate free–free continuum and in binary systems hosting a colliding-wind region, non-thermal emission has also been detected. To date, the most abundant data have been collected from frequencies higher than 1 GHz. We present here the results obtained from observations at 325 and 610 MHz, carried out

    更新日期:2020-07-15
  • Understanding galaxy formation and evolution through an all-sky submillimetre spectroscopic survey
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-06-29
    Mattia Negrello; Matteo Bonato; Zhen-Yi Cai; Helmut Dannerbauer; Gianfranco De Zotti; Jacques Delabrouille; Douglas Scott

    We illustrate the extraordinary discovery potential for extragalactic astrophysics of a far-infrared/submillimetre (far-IR/submm) all-sky spectroscopic survey with a 3-m-class space telescope. Spectroscopy provides a three-dimensional view of the Universe and allows us to take full advantage of the sensitivity of present-day instrumentation, close to fundamental limits, overcoming the spatial confusion

    更新日期:2020-06-29
  • The bivariate gas–stellar mass distributions and the mass functions of early- and late-type galaxies at $z\,{\sim}\,0$
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-06-19
    Aldo Rodríguez-Puebla; A. R. Calette; Vladimir Avila-Reese; Vicente Rodriguez-Gomez; Marc Huertas-Company

    We report the bivariate $\rm HI$ - and $\rm H_{2}$ -stellar mass distributions of local galaxies in addition of an inventory of galaxy mass functions, MFs, for $\rm HI$ , $\rm H_{2}$ , cold gas, and baryonic mass, separately into early- and late-type galaxies. The MFs are determined using the $\rm HI$ and $\rm H_{2}$ conditional distributions and the galaxy stellar mass function (GSMF). For the conditional

    更新日期:2020-06-19
  • Calibration database for the Murchison Widefield Array All-Sky Virtual Observatory
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-06-11
    Marcin Sokolowski; Christopher H. Jordan; Gregory Sleap; Andrew Williams; Randall Bruce Wayth; Mia Walker; David Pallot; Andre Offringa; Natasha Hurley-Walker; Thomas M. O. Franzen; Melanie Johnston-Hollitt; David L. Kaplan; David Kenney; Steven J. Tingay

    We present a calibration component for the Murchison Widefield Array All-Sky Virtual Observatory (MWA ASVO) utilising a newly developed PostgreSQL database of calibration solutions. Since its inauguration in 2013, the MWA has recorded over 34 petabytes of data archived at the Pawsey Supercomputing Centre. According to the MWA Data Access policy, data become publicly available 18 months after collection

    更新日期:2020-06-11
  • Self-similar structure of resistive ADAFs with outflow and large-scale magnetic field
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-06-11
    S. M. Ghoreyshi

    The observations and simulations have revealed that large-scale magnetic field and outflows can exist in the inner regions of an advection-dominated accretion disc where the resistive diffusion may also be important. In the present paper, the roles of large-scale magnetic field and outflows in the structure of resistive advection-dominated accretion discs are explored by assuming that the accretion

    更新日期:2020-06-11
  • Bridging the ultraviolet and optical regions: Transformation equations between GALEX and UBV photometric systems
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-06-10
    S. Bilir; N. Alan; S. Tunçel Güçtekin; M. Çelebi; T. Yontan; O. Plevne; S. Ak; T. Ak; S. Karaali

    We derive transformation equations between GALEX and UBV colours by using the reliable data of 556 stars. We present two sets of equations: as a function of (only) luminosity class and as a function of both luminosity class and metallicity. The metallicities are provided from the literature, while the luminosity classes are determined by using the PARSEC mass tracks in this study. Small colour residuals

    更新日期:2020-06-10
  • The Parkes Pulsar Timing Array project: second data release
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-06-05
    Matthew Kerr; Daniel J. Reardon; George Hobbs; Ryan M. Shannon; Richard N. Manchester; Shi Dai; Christopher J. Russell; Songbo Zhang; Willem van Straten; Stefan Osłowski; Aditya Parthasarathy; Renee Spiewak; Matthew Bailes; N. D. Ramesh Bhat; Andrew D. Cameron; William A. Coles; James Dempsey; Xinping Deng; Boris Goncharov; Jane F. Kaczmarek; Michael J. Keith; Paul D. Lasky; Marcus E. Lower; Brett

    We describe 14 yr of public data from the Parkes Pulsar Timing Array (PPTA), an ongoing project that is producing precise measurements of pulse times of arrival from 26 millisecond pulsars using the 64-m Parkes radio telescope with a cadence of approximately 3 weeks in three observing bands. A comprehensive description of the pulsar observing systems employed at the telescope since 2004 is provided

    更新日期:2020-06-05
  • The GLEAM 4-Jy (G4Jy) Sample: II. Host galaxy identification for individual sources
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-06-01
    Sarah V. White; Thomas M. O. Franzen; Chris J. Riseley; O. Ivy Wong; Anna D. Kapińska; Natasha Hurley-Walker; Joseph R. Callingham; Kshitij Thorat; Chen Wu; Paul Hancock; Richard W. Hunstead; Nick Seymour; Jesse Swan; Randall Wayth; John Morgan; Rajan Chhetri; Carole Jackson; Stuart Weston; Martin Bell; B. M. Gaensler; Melanie Johnston–Hollitt; André Offringa; Lister Staveley–Smith

    The entire southern sky (Declination, $\delta< 30^{\circ}$ ) has been observed using the Murchison Widefield Array (MWA), which provides radio imaging of $\sim$ 2 arcmin resolution at low frequencies (72–231 MHz). This is the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey, and we have previously used a combination of visual inspection, cross-checks against the literature, and internal matching

    更新日期:2020-06-01
  • The GLEAM 4-Jy (G4Jy) Sample: I. Definition and the catalogue
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-06-01
    Sarah V. White; Thomas M. O Franzen; Chris J. Riseley; O. Ivy Wong; Anna D. Kapińska; Natasha Hurley-Walker; Joseph R. Callingham; Kshitij Thorat; Chen Wu; Paul Hancock; Richard W. Hunstead; Nick Seymour; Jesse Swan; Randall Wayth; John Morgan; Rajan Chhetri; Carole Jackson; Stuart Weston; Martin Bell; Bi-Qing For; B. M. Gaensler; Melanie Johnston-Hollitt; André Offringa; Lister Staveley-Smith

    The Murchison Widefield Array (MWA) has observed the entire southern sky (Declination, $\delta< 30^{\circ}$ ) at low radio frequencies, over the range 72–231MHz. These observations constitute the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey, and we use the extragalactic catalogue (EGC) (Galactic latitude, $|b| >10^{\circ}$ ) to define the GLEAM 4-Jy (G4Jy) Sample. This is a complete sample

    更新日期:2020-06-01
  • A linear formation-flying astronomical interferometer in low Earth orbit
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-05-29
    Jonah T. Hansen; Michael J. Ireland

    Space interferometry is the inevitable end point of high angular resolution astrophysics, and a key technology that can be leveraged to analyse exoplanet formation and atmospheres with exceptional detail. However, the anticipated cost of large missions, such as Darwin and TPF-I, and inadequate technology readiness levels have resulted in limited developments since the late 2000s. Here, we present a

    更新日期:2020-05-29
  • SimSpin—Constructing mock IFS kinematic data cubes
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-05-11
    Katherine E. Harborne; Chris Power; Aaron S. G. Robotham

    We present SimSpin, a new, public, software framework for generating integral field spectroscopy (IFS) data cubes from N-body/hydrodynamical simulations of galaxies, which can be compared directly with observational datasets. SimSpin provides a consistent method for studying a galaxy’s stellar component. It can be used to explore how observationally inferred measurements of kinematics, such as the

    更新日期:2020-05-11
  • An ultra-wide bandwidth (704 to 4 032 MHz) receiver for the Parkes radio telescope
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-04-08
    George Hobbs; Richard N. Manchester; Alex Dunning; Andrew Jameson; Paul Roberts; Daniel George; J. A. Green; John Tuthill; Lawrence Toomey; Jane F. Kaczmarek; Stacy Mader; Malte Marquarding; Azeem Ahmed; Shaun W. Amy; Matthew Bailes; Ron Beresford; N. D. R. Bhat; Douglas C.-J. Bock; Michael Bourne; Mark Bowen; Michael Brothers; Andrew D. Cameron; Ettore Carretti; Nick Carter; Santy Castillo; Raji Chekkala;

    We describe an ultra-wide-bandwidth, low-frequency receiver recently installed on the Parkes radio telescope. The receiver system provides continuous frequency coverage from 704 to 4032 MHz. For much of the band ( ${\sim}60\%$ ), the system temperature is approximately 22 K and the receiver system remains in a linear regime even in the presence of strong mobile phone transmissions. We discuss the scientific

    更新日期:2020-04-08
  • High-cadence optical transient searches using drift scan imaging I: Proof of concept with a pre-prototype system
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-04-08
    Steven Tingay

    An imaging technique with sensitivity to short duration optical transients is described. The technique is based on the use of wide-field cameras operating in a drift scanning mode, whereby persistent objects produce trails on the sensor and short duration transients occupy localised groups of pixels. A benefit of the technique is that sensitivity to short duration signals is not accompanied by massive

    更新日期:2020-04-08
  • The core-cusp problem revisited: ULDM vs. CDM
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-03-25
    Emily Kendall; Richard Easther

    The core-cusp problem is a widely cited motivation for the exploration of dark matter models beyond standard cold dark matter. One such alternative is ultralight dark matter (ULDM), extremely light scalar particles exhibiting wavelike properties on kiloparsec scales. Astrophysically realistic ULDM halos are expected to consist of inner solitonic cores embedded in NFW-like outer halos. The presence

    更新日期:2020-03-25
  • PKS 2250–351: A giant radio galaxy in Abell 3936
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-03-25
    N. Seymour; M. Huynh; S. S. Shabala; J. Rogers; L. J. M. Davies; R. J. Turner; A. O’Brien; C. H. Ishwara-Chandra; J. E. Thorne; T. J. Galvin; T. Jarrett; H. Andernach; C. Anderson; J. Bunton; K. Chow; J. D. Collier; S. Driver; M. D. Filipovic; G. Gürkan; A. M. Hopkins; A. D. Kapińska; D. A. Leahy; J. Marvil; P. Manojlovic; R. P. Norris; C. Phillips; A. Robotham; L. Rudnick; V. Singh; S. V. White

    We present a detailed analysis of the radio galaxy PKS $2250{-}351$ , a giant of 1.2 Mpc projected size, its host galaxy, and its environment. We use radio data from the Murchison Widefield Array, the upgraded Giant Metre-wavelength Radio Telescope, the Australian Square Kilometre Array Pathfinder, and the Australia Telescope Compact Array to model the jet power and age. Optical and IR data come from

    更新日期:2020-03-25
  • The development of non-coherent passive radar techniques for space situational awareness with the Murchison Widefield Array
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-03-23
    Steve Prabu; Paul J. Hancock; Xiang Zhang; Steven J. Tingay

    The number of active and non active satellites in Earth orbit has dramatically increased in recent decades, requiring the development of novel surveillance techniques to monitor and track them. In this paper, we build upon previous non-coherent passive radar space surveillance demonstrations undertaken using the Murchison Widefield Array (MWA). We develop the concept of the Dynamic Signal to Noise

    更新日期:2020-03-23
  • A survey of extended matter around chromospherically active binary systems
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-03-23
    Osman Karakuş; Fehmi Ekmekçi

    We present an analysis of colour excess (CE) observations for 13 chromospherically active binary systems, together with 27 inactive reference stars of similar spectral types and luminosity classes of the components of these 13 binaries. We used the observations which were made by Johnson-Cousins ${BVR}_{c}\mathrm{I}_{c}$ , 2MASS, and WISE photometric systems. Our new photometric ${BVR}_{c}\mathrm{I}_{c}$

    更新日期:2020-03-23
  • Science with the Murchison Widefield Array: Phase I results and Phase II opportunities – Corrigendum
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-03-23
    A. P. Beardsley; M. Johnston-Hollitt; C. M. Trott; J. C. Pober; J. Morgan; D. Oberoi; D. L. Kaplan; C. R. Lynch; G. E. Anderson; P. I. McCauley; S. Croft; C. W. James; O. I. Wong; C. D. Tremblay; R. P. Norris; I. H. Cairns; C. J. Lonsdale; P. J. Hancock; B. M. Gaensler; N. D. R. Bhat; W. Li; N. Hurley-Walker; J. R. Callingham; N. Seymour; S. Yoshiura; R. C. Joseph; K. Takahashi; M. Sokolowski; J. C

    The Murchison Widefield Array (MWA) is an open access telescope dedicated to studying the low-frequency (80–300 MHz) southern sky. Since beginning operations in mid-2013, the MWA has opened a new observational window in the southern hemisphere enabling many science areas. The driving science objectives of the original design were to observe 21 cm radiation from the Epoch of Reionisation (EoR), explore

    更新日期:2020-03-23
  • Cosmology with Phase 1 of the Square Kilometre Array Red Book 2018: Technical specifications and performance forecasts
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-03-06
    Square Kilometre Array Cosmology Science Working Group:; David J. Bacon; Richard A. Battye; Philip Bull; Stefano Camera; Pedro G. Ferreira; Ian Harrison; David Parkinson; Alkistis Pourtsidou; Mário G. Santos; Laura Wolz; Filipe Abdalla; Yashar Akrami; David Alonso; Sambatra Andrianomena; Mario Ballardini; José Luis Bernal; Daniele Bertacca; Carlos A. P. Bengaly; Anna Bonaldi; Camille Bonvin; Michael

    We present a detailed overview of the cosmological surveys that we aim to carry out with Phase 1 of the Square Kilometre Array (SKA1) and the science that they will enable. We highlight three main surveys: a medium-deep continuum weak lensing and low-redshift spectroscopic HI galaxy survey over 5 000 deg2; a wide and deep continuum galaxy and HI intensity mapping (IM) survey over 20 000 deg2 from $z

    更新日期:2020-03-06
  • Evolution of mobile phases in cometary interiors
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-02-24
    Christopher M. Fellows; Trevor C. Brown; Andrew Cooper; Marco Parigi

    Beginning with loose aggregations of dust particles coated with heterogeneous ices under vacuum at Kuiper Belt temperatures, moving to Jupiter/Saturn distances and eventually to low-perihelion orbit, we consider the likely development of the gaseous phase within a cometary nucleus over the course of its lifetime. From the perspective of physical chemistry, we consider limits on the spatial and temporal

    更新日期:2020-02-24
  • Fundamental physics with the Square Kilometre Array
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-01-27
    A. Weltman; P. Bull; S. Camera; K. Kelley; H. Padmanabhan; J. Pritchard; A. Raccanelli; S. Riemer-Sørensen; L. Shao; S. Andrianomena; E. Athanassoula; D. Bacon; R. Barkana; G. Bertone; C. Bœhm; C. Bonvin; A. Bosma; M. Brüggen; C. Burigana; F. Calore; J. A. R. Cembranos; C. Clarkson; R. M. T. Connors; Á. de la Cruz-Dombriz; P. K. S. Dunsby; J. Fonseca; N. Fornengo; D. Gaggero; I. Harrison; J. Larena;

    The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over a wide range of frequencies, and with an order of magnitude greater sensitivity and survey speed than any current radio telescope. The SKA will address many important topics in astronomy, ranging from planet formation to distant galaxies. However, in this work, we consider the perspective of the SKA as

    更新日期:2020-01-27
  • Investigation of the coronal heating through phase relation of solar activity indexes
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-01-24
    K. J. Li; J. C. Xu; Z. Q. Yin; J. L. Xie; W. Feng

    The coronal heating problem is a long-standing perplexing issue. In this study, 13 solar activity indexes are used to investigate their phase relation with the sunspot number (SSN). Only three of them are found to statistically significantly lag the SSN (large-scale magnetic activity) by about one solar rotation period; the three indexes are total solar irradiance (TSI), the modified coronal index

    更新日期:2020-01-24
  • Outbursts of the black hole X-ray transient KV UMa (XTE J1118+480) in the optical band
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-01-22
    Vojtěch Šimon

    KV UMa (XTE J1118+480) is an X-ray binary that is known to undergo outbursts in 2000 and 2005. This paper presents the discovery of a large outburst starting in 1927 on the archival photographic plates and an analysis of the long-term optical activity of this system. We used the photographic data from DASCH (Digital Access to a Sky Century @ Harvard). We placed the 1927 outburst in the context of the

    更新日期:2020-01-22
  • HIPPI-2: A versatile high-precision polarimeter
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-01-01
    Jeremy Bailey; Daniel V. Cotton; Lucyna Kedziora-Chudczer; Ain De Horta; Darren Maybour

    We describe the High-Precision Polarimetric Instrument-2 (HIPPI-2) a highly versatile stellar polarimeter developed at the University of New South Wales. Two copies of HIPPI-2 have been built and used on the 60-cm telescope at Western Sydney University’s (WSU) Penrith Observatory, the 8.1-m Gemini North Telescope at Mauna Kea and extensively on the 3.9-m Anglo-Australian Telescope (AAT). The precision

    更新日期:2020-01-01
  • Resistive accretion flows around a Kerr black hole
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-01-01
    M. Shaghaghian

    In this paper, we present the stationary axisymmetric configuration of a resistive magnetised thick accretion disc in the vicinity of external gravity and intrinsic dipolar magnetic field of a slowly rotating black hole. The plasma is described by the equations of fully general relativistic magnetohydrodynamics (MHD) along with the Ohm’s law and in the absence of the effects of radiation fields. We

    更新日期:2020-01-01
  • Fireball streak detection with minimal CPU processing requirements for the Desert Fireball Network data processing pipeline
    Publ. Astron. Soc. Aust. (IF 5.067) Pub Date : 2020-01-01
    Martin C. Towner; Martin Cupak; Jean Deshayes; Robert M. Howie; Ben A. D. Hartig; Jonathan Paxman; Eleanor K. Sansom; Hadrien A. R. Devillepoix; Trent Jansen-Sturgeon; Philip A. Bland

    The detection of fireballs streaks in astronomical imagery can be carried out by a variety of methods. The Desert Fireball Network uses a network of cameras to track and triangulate incoming fireballs to recover meteorites with orbits and to build a fireball orbital dataset. Fireball detection is done on-board camera, but due to the design constraints imposed by remote deployment, the cameras are limited

    更新日期:2020-01-01
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