Galaxy luminosity function and Tully-Fisher relation: reconciled through rotation-curve studies

Journal Article · Mon Mar 10 00:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/783/2/66· OSTI ID:22351333

Cattaneo, Andrea ^[1]; Salucci, Paolo ^[2]; Papastergis, Emmanouil ^[3]

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1. Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Universite d'Aix-Marseille, 38 Rue F. Joliot-Curie, F-13388 Marseille Cedex 13 (France)
2. Department of Astrophysics, SISSA, Via Beirut, 2-4, I-34014 Trieste (Italy)
3. Center for Radiophysics and Space Research, Space Sciences Building, Cornell University, Ithaca, NY 14853 (United States)

The relation between galaxy luminosity L and halo virial velocity v {sub vir} required to fit the galaxy luminosity function differs from the observed Tully-Fisher relation between L and disk speed v {sub rot}. Because of this, the problem of reproducing the galaxy luminosity function and the Tully-Fisher relation simultaneously has plagued semianalytic models since their inception. Here we study the relation between v {sub rot} and v {sub vir} by fitting observational average rotation curves of disk galaxies binned in luminosity. We show that the v {sub rot}-v {sub vir} relation that we obtain in this way can fully account for this seeming inconsistency. Therefore, the reconciliation of the luminosity function with the Tully-Fisher relation rests on the complex dependence of v {sub rot} on v {sub vir}, which arises because the ratio of stellar mass to dark matter mass is a strong function of halo mass.

• OSTI ID: 22351333
• Journal Information: Astrophysical Journal, Vol. 783, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COMPUTERIZED SIMULATION
GALAXIES
LUMINOSITY
MASS
NONLUMINOUS MATTER
ROTATION