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The Califa and Hipass circular velocity function for all morphological galaxy types

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Marino, Raffaella Anna and otros, ... (2016) The Califa and Hipass circular velocity function for all morphological galaxy types. Astrophysical journal letters, 827 (2). ISSN 2041-8205

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Official URL: http://dx.doi.org/10.3847/2041-8205/827/2/L36


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http://iopscience.iop.org/Publisher


Abstract

The velocity function (VF) is a fundamental observable statistic of the galaxy population that is similar to the luminosity function in importance, but much more difficult to measure. In this work we present the first directly measured circular VF that is representative between 60 < v_circ < 320 km s^-1 for galaxies of all morphological types at a given rotation velocity. For the low-mass galaxy population (60 < v_circ < 170 km s^-1), we use the HI Parkes All Sky Survey VF. For the massive galaxy population (170 < v_circ < 320 km s^-1), we use stellar circular velocities from the Calar Alto Legacy Integral Field Area Survey (CALIFA). In earlier work we obtained the measurements of circular velocity at the 80% light radius for 226 galaxies and demonstrated that the CALIFA sample can produce volume-corrected galaxy distribution functions. The CALIFA VF includes homogeneous velocity measurements of both late and early-type rotation-supported galaxies and has the crucial advantage of not missing gas-poor massive ellipticals that HI surveys are blind to. We show that both VFs can be combined in a seamless manner, as their ranges of validity overlap. The resulting observed VF is compared to VFs derived from cosmological simulations of the z = 0 galaxy population. We find that dark-matter-only simulations show a strong mismatch with the observed VF. Hydrodynamic simulations fare better, but still do not fully reproduce observations.


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© 2016. The American Astronomical Society. All rights reserved. Artículo firmado por 19 autores. S.B. acknowledges support from BMBF through the Erasmus-F project (grant number 05 A12BA1) and is grateful to Leibniz-Institut fur Astrophysik Potsdam for its hospitality during her guest stay there in 2016. J.F.B. acknowledges support from grant AYA2013-48226-C3-1-P from the Spanish Ministry of Economy and Competitiveness (MINECO). C.J.W. acknowledges support through the Marie Curie Career Integration Grant 303912. S.F.S. thanks the CONACYT-125180 and DGAPA-IA100815 projects for providing support during this study. D.O. thanks the University of Western Australia for its support via a Research Collaboration Award. K.S. acknowledges funding from the Natural Sciences and Engineering Research Council of Canada.

Uncontrolled Keywords:Dark-matter halos; Field area survey; Evolution; Project; Sample
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:39954
Deposited On:10 Nov 2016 16:10
Last Modified:10 Dec 2018 15:04

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