Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-25T02:58:42.146Z Has data issue: false hasContentIssue false
  • English
  • Français

New evidence for halo gas accretion onto disk galaxies

Published online by Cambridge University Press:  01 June 2008

Filippo Fraternali
Filippo Fraternali*
Affiliation:
Astronomy Department, University of Bologna, via Ranzani 1, I-40127, Bologna, Italy email: [email protected]
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.

Studies of the halo gas in the Milky Way and in nearby spiral galaxies show the presence of gas complexes that cannot be reconciled with an internal (galactic fountain) origin and are direct evidence of gas accretion. Estimating gas accretion rates from these features consistently gives values, which are one order of magnitude lower than what is needed to feed the star formation. I show that this problem can be overcome if most of the accretion is in fact “hidden” as it mixes with the galactic fountain material coming from the disk. This model not only provides an explanation for the missing gas accretion but also reproduces the peculiar kinematics of the halo gas in particular the vertical rotation gradient. In this view this gradient becomes indirect evidence for gas accretion.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 255 - 262
Copyright
Copyright © International Astronomical Union 2009

References

Barbieri, C. V., Fraternali, F., Oosterloo, T., Bertin, G., Boomsma, R., & Sancisi, R. 2005, A&A, 439, 947Google Scholar
Blitz, L., Spergel, D. N., Teuben, P. J., Hartmann, D., & Burton, W. B. 1999, ApJ, 514, 818Google Scholar
Boomsma, R., Oosterloo, T. A., Fraternali, F., van der Hulst, J. M., & Sancisi, R. 2005, A&A, 431, 65Google Scholar
Boomsma, R., Oosterloo, T. A., Fraternali, F., van der Hulst, J. M., & Sancisi, R. 2008, A&A, in pressGoogle Scholar
Bregman, J. N. 1980, ApJ, 236, 577Google Scholar
Chaves, T. A. & Irwin, J. A. 2001, ApJ, 557, 646CrossRefGoogle Scholar
Fraternali, F., Oosterloo, T., Sancisi, R., & van Moorsel, G. 2001, ApJ, 562, L47Google Scholar
Fraternali, F., van Moorsel, G., Sancisi, R., & Oosterloo, T. 2002, AJ, 123, 3124Google Scholar
Fraternali, F., Oosterloo, T., Sancisi, R., & Swaters, R. 2005, in: ed. Braun, R., Extra-planar Gas, Dwingeloo, ASP Conf. Series, Vol. 331, p. 239Google Scholar
Fraternali, F. & Binney, J. J. 2006, MNRAS, 366, 449CrossRefGoogle Scholar
Fraternali, F. & Binney, J. J. 2008, MNRAS, 386, 935CrossRefGoogle Scholar
Kalberla, P. M. W., Dedes, L. 2008, A&A, in press (arXiv0804.4831)Google Scholar
Kewley, L. J., Geller, M. J., Jansen, R. A., & Dopita, M. A. 2002, AJ, 124, 3135CrossRefGoogle Scholar
Grossi, M., Giovanardi, C., Corbelli, E., Giovanelli, R., Haynes, M. P., Martin, A. M., Saintonge, A., & Dowell, J. D. 2008, A&A, in press (arXiv0806.0412)Google Scholar
Heald, G. H., Rand, R. J., Benjamin, R. A., Collins, J. A., & Bland-Hawthorn, J. 2006a, ApJ, 636, 181CrossRefGoogle Scholar
Heald, G. H., Rand, R. J., Benjamin, R. A., & Bershady, M. A. 2006b, ApJ, 647, 1018CrossRefGoogle Scholar
Hopkins, A. M., McClure-Griffiths, N. M., & Gaensler, B. M. 2008, ApJ, 682, L13Google Scholar
Hulsbosch, A. N. M. 1968, BAN, 20, 33Google Scholar
Irwin, J. A. 1994, ApJ, 429, 618CrossRefGoogle Scholar
Levine, E. S., Heiles, C., & Blitz, L. 2008, ApJ, 679, 1288Google Scholar
Lee, S.-W. & Irwin, J. A. 1997, ApJ, 490, 247Google Scholar
Lockman, F. J. 1984, ApJ, 283, 90CrossRefGoogle Scholar
Matthews, L. D. & Wood, K. 2003, ApJ, 593, 721Google Scholar
Oosterloo, T., Fraternali, F., & Sancisi, R. 2007, AJ, 134, 1019CrossRefGoogle Scholar
Oort, J. H. 1970, A&A, 7, 381Google Scholar
Pedersen, K., Rasmussen, J., Sommer-Larsen, J., Toft, S., Benson, A. J., & Bower, R. G. 2006, NewA, 11, 465Google Scholar
Rand, R. J., & Benjamin, R. A. 2008, ApJ, 676, 991Google Scholar
Reakes, M. L., & Newton, K. 1978, MNRAS, 185, 277Google Scholar
Rossa, J., & Dettmar, R.-J. 2003, A&A, 406, 505Google Scholar
Sancisi, R., Fraternali, F., Oosterloo, T., & van der Hulst, T. 2008, A&ARv, 15, 189Google Scholar
Thilker, D. A., Braun, R., Walterbos, R. A. M., Corbelli, E., Lockman, F. J., Murphy, E., & Maddalena, R. 2004, ApJ, 601, L39CrossRefGoogle Scholar
Twarog, B. A. 1980, ApJ, 242, 242CrossRefGoogle Scholar
Wakker, B. P & van Woerden, H. 1997, ARA&A, 35, 217Google Scholar
Wakker, B. P. 2001, ApJS, 136, 463Google Scholar
Wakker, B. P., York, D. G., Howk, C., Barentine, J. C., Wilhelm, R., Peletier, R. F., van Woerden, H., Beers, T. C., Ivezic, Z., Richter, P., & Schwarz, U. J. 2007, ApJ, 670, L113Google Scholar
Wakker, B. P., York, D. G., Wilhelm, R., Barentine, J. C., Richter, P., Beers, T. C., Ivezić, Z., & Howk, J. C. 2008, ApJ, 672, 298Google Scholar
Walterbos, R. A. M., Braun, R. 1994, ApJ, 431, 156CrossRefGoogle Scholar