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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

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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.

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