Abstract
The puzzling correlation between the spin parameter λ of galactic disks and the disk-to-halo mass fraction f disk is investigated. It is shown that such a correlation arises naturally from large uncertainties in determining the virial masses of dark matter halos. This result indicates that halo properties derived from fits to observed rotation curves are still very uncertain. An analysis of λ versus f disk as function of the adopted halo virial mass shows that for reasonable halo concentrations f disk ≈ 0.01 - 0.07 which is significantly smaller than the universal baryon fraction. Most of the available gas either never settled into the galactic disks or was ejected subsequently.
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Abadi, M.G., Navarro, J.F., Steinmetz, M. and Eke, V.R.: 2002, astro-ph/0211331.
Bullock, J.S., Dekel, A., Kolatt, T.S., Kravtsov, A.V., Klypin, A.A., Porciani, C. and Primack, J.R.:2001, ApJ 555, 240.
Hoyle, F.: 1953, ApJ 118, 513.
Maller, A.H., Dekel, A. and Somerville, R.S.: MNRAS 329, 423.
Maller, A.H. and Dekel, A.: 2002, MNRAS 335, 487.
Mo, H.J., Mao, S. and White, S.D.M.: 1998, MNRAS 295, 319.
Navarro, J.F. and Benz, W.: 1991, ApJ 380, 320.
Navarro, J.F. and Steinmetz, M.: 1997, ApJ 478, 13.
Navarro, J.F., Frenk, C.S. and White, S.D.M.: ApJ 490, 493.
Navarro, J.F. and Steinmetz, M.: 2000, ApJ 538, 477.
Peebles, P.J.E.: 1969, ApJ 155, 393.
Sommer-Larsen, J., Gelato, S. and Vedel, H.: 1999, ApJ 519, 501.
Thacker, R.J. and Couchman, H.M.P.: 2001, ApJ 555, 17.
van den Bosch, F.C., Abel, T., Croft, R.A.C., Hernquist, L. and White, S.D.M.: 2002, ApJ 576, 21.
van den Bosch, F.C., Burkert, A. and Swaters, R.A.: 2001, MNRAS 326, 1205.
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Burkert, A. The origin of the correlation between the spin parameter and the baryon fraction of galactic disks. Astrophysics and Space Science 284, 697–700 (2003). https://doi.org/10.1023/A:1024051215998
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DOI: https://doi.org/10.1023/A:1024051215998