Hostname: page-component-8448b6f56d-sxzjt Total loading time: 0 Render date: 2024-04-23T05:38:56.262Z Has data issue: false hasContentIssue false
  • English
  • Français

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: yakov.faerman@gmail.com
Amiel Sternberg
Affiliation:
Raymond and Beverly Sackler School of Physics & Astronomy, Tel Aviv University, Ramat Aviv 69978, Israel, email: amiel@astro.tau.ac.il 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: cmckee@astro.berkeley.edu
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Adams, E. A. K., Giovanelli, R., & Haynes, M. P. 2013, ApJ, 768, 7710.1088/0004-637X/768/1/77CrossRefGoogle Scholar
Adams, E. A. K., Oosterloo, T. A., Cannon, J. M., Giovanelli, R., & Haynes, M. P. 2016, A&A, 596, A117Google Scholar
Blitz, L., Spergel, D. N., Teuben, P. J., Hartmann, D., & Burton, W. B. 1999, ApJ, 514, 81810.1086/306963CrossRefGoogle Scholar
Boylan-Kolchin, M., Bullock, J. S., & Kaplinghat, M. 2011, MNRAS, 415, L4010.1111/j.1745-3933.2011.01074.xCrossRefGoogle Scholar
Braun, R., & Burton, W. B. 1999, A&A, 341, 437Google ScholarPubMed
Bullock, J. S., & Boylan-Kolchin, M. 2017, ARAA, 55, 34310.1146/annurev-astro-091916-055313CrossRefGoogle Scholar
Burkert, A. 1995, ApJ (Letters), 447, L2510.1086/309560CrossRefGoogle Scholar
de Blok, W. J. G., Walter, F., Brinks, E., et al. 2008, AJ, 136, 264810.1088/0004-6256/136/6/2648CrossRefGoogle Scholar
Faerman, Y., Sternberg, A., & McKee, C. F. 2013, ApJ, 777, 11910.1088/0004-637X/777/2/119CrossRefGoogle Scholar
Faerman, Y., Sternberg, A., & McKee, C. F. 2017, ApJ, 835, 5210.3847/1538-4357/835/1/52CrossRefGoogle Scholar
Gentile, G., Salucci, P., Klein, U., Vergani, D., & Kalberla, P. 2004, MNRAS, 351, 90310.1111/j.1365-2966.2004.07836.xCrossRefGoogle Scholar
Giovanelli, R., Haynes, M. P., Kent, B. R., et al. 2005, AJ, 130, 259810.1086/497431CrossRefGoogle Scholar
Giovanelli, R., Haynes, M. P., Kent, B. R., & Adams, E. A. K. 2010, ApJ (Letters), 708, L2210.1088/2041-8205/708/1/L22CrossRefGoogle Scholar
Giovanelli, R., Haynes, M. P., Adams, E. A. K., et al. 2013, AJ, 146, 1510.1088/0004-6256/146/1/15CrossRefGoogle Scholar
Haardt, F. & Madau, P., 2012, ApJ, 746, 12510.1088/0004-637X/746/2/125CrossRefGoogle Scholar
Haynes, M. P., Giovanelli, R., Martin, A. M., et al. 2011, AJ, 142, 17010.1088/0004-6256/142/5/170CrossRefGoogle Scholar
Irwin, M. J., Belokurov, V., Evans, N. W., et al. 2007, ApJ (Letters), 656, L1310.1086/512183CrossRefGoogle Scholar
Janesh, W., Rhode, K. L., Salzer, J. J., et al. 2017, ApJ (Letters), 837, L16Google Scholar
Klypin, A., Kravtsov, A. V., Valenzuela, O., & Prada, F. 1999, ApJ, 522, 8210.1086/307643CrossRefGoogle Scholar
McConnachie, A. W. 2012, AJ, 144, 410.1088/0004-6256/144/1/4CrossRefGoogle Scholar
McQuinn, K. B. W., Skillman, E. D., Berg, D., et al. 2013. AJ, 146, 14510.1088/0004-6256/146/6/145CrossRefGoogle Scholar
Moore, B., Ghigna, S., Governato, F., et al. 1999, ApJ (Letters), 524, L1910.1086/312287CrossRefGoogle Scholar
Navarro, J. F., Frenk, C. S., & White, S. D. M. 1997, ApJ, 490, 49310.1086/304888CrossRefGoogle Scholar
Oort, J. H. 1970, A&A, 7, 381Google Scholar
Putman, M. E., Peek, J. E. G., & Joung, M. R. 2012, ARAA, 50, 49110.1146/annurev-astro-081811-125612CrossRefGoogle Scholar
Rhode, K. L., Salzer, J. J., Haurberg, N. C., et al. 2013, AJ, 145, 14910.1088/0004-6256/145/6/149CrossRefGoogle Scholar
Rocha, M., Peter, A. H. G., Bullock, J. S., et al. 2013, MNRAS, 430, 8110.1093/mnras/sts514CrossRefGoogle Scholar
Ryan-Weber, E. V., Begum, A., Oosterloo, T., et al. 2008, MNRAS, 384, 53510.1111/j.1365-2966.2007.12734.xCrossRefGoogle Scholar
Sand, D. J., Crnojević, D., Bennet, P., et al. 2015, ApJ, 806, 9510.1088/0004-637X/806/1/95CrossRefGoogle Scholar
Saul, D. R., Peek, J. E. G., Grcevich, J., et al. 2012, ApJ, 758, 4410.1088/0004-637X/758/1/44CrossRefGoogle Scholar
Skillman, E. D., Salzer, J. J., Berg, D. A., et al. 2013, AJ, 146, 310.1088/0004-6256/146/1/3CrossRefGoogle Scholar
Springel, V., Wang, J., Vogelsberger, M., et al. 2008, MNRAS, 391, 168510.1111/j.1365-2966.2008.14066.xCrossRefGoogle Scholar
Sternberg, A., McKee, C. F., & Wolfire, M. G. 2002, ApJS, 143, 41910.1086/343032CrossRefGoogle Scholar
Strigari, L. E., Bullock, J. S., Kaplinghat, M., et al. Nature, 454, 109610.1038/nature07222CrossRefGoogle Scholar
Tollerud, E. J., Bullock, J. S., Strigari, L. E., & Willman, B. 2008, ApJ, 688, 27710.1086/592102CrossRefGoogle Scholar
Tollerud, E. J., & Peek, J. E. G. 2018, ApJ, 857, 4510.3847/1538-4357/aab3e4CrossRefGoogle Scholar
Walker, M. G., & Peñarrubia, J. 2011, ApJ, 742, 2010.1088/0004-637X/742/1/20CrossRefGoogle Scholar
Zavala, J., Vogelsberger, M., & Walker, M. G. 2013, MNRAS, 431, L2010.1093/mnrasl/sls053CrossRefGoogle Scholar
Zolotov, A., Brooks, A. M., Willman, B., et al. 2012, ApJ, 761, 7110.1088/0004-637X/761/1/71CrossRefGoogle Scholar