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Ultra-Compact High Velocity Clouds as Minihalos and Dwarf Galaxies
| Content Provider | Scilit |
|---|---|
| Author | Faerman, Yakov Sternberg, Amiel McKee, Christopher F. |
| Copyright Year | 2018 |
| Description | 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 $~10^{4}$ 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. |
| Related Links | http://arxiv.org/pdf/1309.0815 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/CD19CF26615F692728DB9229D76FC2F4/S1743921318006269a.pdf/div-class-title-ultra-compact-high-velocity-clouds-as-minihalos-and-dwarf-galaxies-div.pdf |
| Ending Page | 487 |
| Page Count | 5 |
| Starting Page | 483 |
| ISSN | 17439213 |
| e-ISSN | 17439221 |
| DOI | 10.1017/s1743921318006269 |
| Journal | Proceedings of the International Astronomical Union |
| Issue Number | S344 |
| Volume Number | 14 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2018-08-01 |
| Access Restriction | Open |
| Subject Keyword | Proceedings of the International Astronomical Union Astronomy and Astrophysics Evolution Formation Dwarf Halos Local Group Dark Matter Galaxies |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
