The HI Content of Local Late-Type Galaxies

Details The HI Content of Local Late-Type Galaxies The HI Content of Local Late-Type Galaxies

2011-10-19

arxiv.org/abs/1110.4199v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 5 figures. Accepted for publication in ApJ. An innovative review on the issue of the dark and luminous distribution i

Scientific paper

10.1088/0004-637X/743/1/45

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.

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