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.
|Titolo:||The HI Content of Local Late-Type Galaxies|
|Autori:||EVOLI C; SALUCCI P; LAPI A; AND DANESE L|
|Rivista:||THE ASTROPHYSICAL JOURNAL|
|Data di pubblicazione:||2011|
|Digital Object Identifier (DOI):||10.1088/0004-637X/743/1/45|
|Appare nelle tipologie:||1.1 Journal article|