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Ultra-Compact High Velocity Clouds as Minihalos and Dwarf Galaxies

Published online by Cambridge University Press:  30 October 2019

Yakov Faerman Open the ORCID record for Yakov Faerman [Opens in a new window] ,
Amiel Sternberg  and
Christopher F. McKee
Yakov Faerman
Affiliation:
The Racah Institute of Physics, The Hebrew University of Jerusalem, 91904, Israel, email: [email protected]
Amiel Sternberg
Affiliation:
Raymond and Beverly Sackler School of Physics & Astronomy, Tel Aviv University, Ramat Aviv 69978, Israel, email: [email protected] Center for Computational Astrophysics, Flatiron Institute, New York, NY 10010, USA
Christopher F. McKee
Affiliation:
Department of Physics and Department of Astronomy, University of California at Berkeley, Berkeley CA 94720, USA, email: [email protected]
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Abstract

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We present dark-matter minihalo models for the Ultra-Compact High Velocity HI Clouds (UCHVCs) recently discovered in the 21 cm ALFALFA survey. We assume gravitational confinement of ~104 K HI gas by flat-cored dark-matter subhalos within the Local Group. For the UCHVCs we calculate the photoionization-limited hydrostatic gas profiles for any distance-dependent total observed HI mass and predict the associated (projected) HI half-mass radii. The observed 21 cm fluxes and half-mass angular radii then constrain the source distances or DM halo parameters. As a consistency check we model the gas-rich dwarf galaxy Leo T, for which the distance is known (420 kpc) and there is a well-resolved HI column density profile. We derive an upper limit for the pressure of any enveloping hot IGM gas at the distance of Leo T. Our analysis supports the scenario that some of the UCHVCs may constitute a population of 21-cm-selected but optically-faint dwarf galaxies in the Local Volume.

Keywords

galaxies: evolutiongalaxies: formationgalaxies: dwarfgalaxies: halosLocal Groupdark matterradio lines: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 483 - 487
Copyright
© International Astronomical Union 2019 

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