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Annual Review of Astronomy and Astrophysics

Volume 56, 2018

Atomic and Ionized Microstructures in the Diffuse Interstellar Medium

Abstract

It has been known for half a century that the interstellar medium (ISM) of our Galaxy is structured on scales as small as a few hundred kilometers, more than 10 orders of magnitude smaller than typical ISM structures and energy input scales. In this review we focus on neutral and ionized structures on spatial scales of a few to ∼104 AU, which appear to be highly overpressured, as these have the most important role in the dynamics and energy balance of interstellar gas: the tiny scale atomic structures (TSASs) and extreme scattering events (ESEs) as the most overpressured example of the tiny scale ionized structures (TSISs). We review observational results and highlight key physical processes at AU scales. We present evidence for and against microstructures as part of a universal turbulent cascade and as discrete structures, and we review their association with supernova remnants, the Local Bubble, and bright stars. We suggest a number of observational and theoretical programs that could clarify the nature of AU structures. TSAS and TSIS probe spatial scales in the range of what is expected for turbulent dissipation scales and are therefore of key importance for constraining exotic and not-well-understood physical processes that have implications for many areas of astrophysics. The emerging picture is one in which a magnetized, turbulent cascade, driven hard by a local energy source and acting jointly with phenomena such as thermal instability, is the source of these microstructures.

Keyword(s): extreme scattering events, interstellar medium structure, interstellar turbulence, tiny scale atomic structure, tiny scale ionized structure
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2018-09-14
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Atomic and Ionized Microstructures in the Diffuse Interstellar Medium
Annual Review of Astronomy and Astrophysics 56, 489 (2018); https://doi.org/10.1146/annurev-astro-081817-051810
/content/journals/10.1146/annurev-astro-081817-051810
/content/journals/10.1146/annurev-astro-081817-051810
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