Hostname: page-component-cb9f654ff-mnl9s Total loading time: 0 Render date: 2025-08-30T21:02:05.192Z Has data issue: false hasContentIssue false
  • English
  • Français

The dark matter density problem in massive disk galaxies

Published online by Cambridge University Press:  26 May 2016

Benjamin J. Weiner
Benjamin J. Weiner*
Affiliation:
UCO/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064, USA

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 discuss measurements of disk mass from non-circular streaming motions of gas in the barred galaxies NGC 3095 and NGC 4123. in these galaxies with strong shocks and non-circular motions, the inner regions must be disk-dominated to reproduce the shocks. This requires dark matter halos of low central density and low concentration, compared to LCDM halo predictions. in addition, the baryonic collapse to a disk should have compressed the halo and increased the dark matter density, which sharpens the disagreement. One possible resolution is a substantial amount of angular momentum transfer from disk to halo, but this is not particularly attractive nor elegant.

Information

Type
Part 8: Bars
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 265 - 270
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Alam, S.M.K., Bullock, J.S., & Weinberg, D.H. 2002, ApJ, 572, 34.Google Scholar
Athanassoula, E., Bosma, A., & Papaioannou, S. 1987, A&A, 179, 23.Google Scholar
Bell, E.F., & de Jong, R.S. 2001, ApJ, 550, 212.Google Scholar
Blumenthal, G.R., Faber, S.M., Flores, R., & Primack, J.R. 1986, ApJ, 301, 27.CrossRefGoogle Scholar
Bullock, J.S. et al. 2001, MNRAS, 321, 559.Google Scholar
Courteau, S., & Rix, H.-W. 1999, ApJ, 513, 561.Google Scholar
Courteau, S., Andersen, D.R., Bershady, M.A., MacArthur, L.A., & Rix, H. 2003, ApJ, 594, 208.Google Scholar
Dalcanton, J.J., Spergel, D.N., & Summers, F.J. 1997, ApJ, 482, 659.Google Scholar
de Blok, W.J.G., McGaugh, S.S., & Rubin, V.C. 2001, AJ, 122, 2396.Google Scholar
Fall, S.M., & Efstathiou, G. 1980, MNRAS, 193, 189.Google Scholar
Giovanelli, R. et al. 1997, AJ, 113, 53.CrossRefGoogle Scholar
Kranz, T., Slyz, A., & Rix, H. 2003, ApJ, 586, 143.Google Scholar
Mo, H.J., Mao, S., & White, S.D.M. 1998, MNRAS, 295, 319.Google Scholar
Navarro, J.F., & Steinmetz, M. 2000, ApJ, 538, 477.Google Scholar
Swaters, R.A., Madore, B.F., van den Bosch, F.C., & Balcells, M. 2003, ApJ, 583, 732.Google Scholar
van Albada, T.S., Bahcall, J.N., Begeman, K., & Sancisi, R. 1985, ApJ, 295, 305.Google Scholar
Weiner, B.J., Sellwood, J.A. & Williams, T.B. 2001, ApJ, 546, 931.Google Scholar