Carmelo Evoli, Paolo Salucci, Andrea Lapi, Luigi Danese
We present a solid relationship between the neutral hydrogen (HI) disk mass
and the stellar disk mass of late-type galaxies in the local Universe. This
relationship is derived by comparing the stellar disk mass function from the
SDSS survey and the HI mass function from the HIPASS survey. We find that the
HI mass in late type galaxies tightly correlates with the stellar mass over
three order of magnitude in stellar disk mass. We crosscheck our result with
that obtained from a sample of HIPASS objects for which the stellar mass has
been obtained by inner kinematics. In addition, we derive the HI vs. halo mass
relationship and the dependence of all the baryonic components in Spirals on
the host halo mass. These relationships bear the imprint of the processes
ruling galaxy formation, and highlight the inefficiency of galaxies both in
forming stars and in retaining their pristine HI gas.
View original:
http://arxiv.org/abs/1110.4199
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