English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the bivariate neutral atomic hydrogen (HI)---stellar mass function(HISMF) (phi(M_HI, M_*)) for massive (log M_*/M_sun > 10) galaxies derived froma sample of 480 local (0.025 < z < 0.050) galaxies observed in HI at Arecibo aspart of the GALEX Arecibo SDSS Survey (GASS). We fit six different models tothe HISMF and find that a Schechter function that extends down to a 1% HI gasfraction, with an additional fractional contribution below that limit, is thebest parametrization of the HISMF. We calculate Omega_{HI, M_* >10^10} and findthat massive galaxies contribute 41% of the HI density in the local universe.In addition to the binned HISMF we derive a continuous bivariate fit, whichreveals that the Schechter parameters only vary weakly with stellar mass:M_HI^*, the characteristic HI mass, scales as M_*^0.39, alpha, the slope of theHISMF at moderate HI masses, scales as M_*^0.07, and f, the fraction ofgalaxies with HI gas fraction greater than 1%, scales as M_*^-0.24. Thevariation of f with stellar mass should be a strong constraint for numericalsimulations. To understand the physical mechanisms that produce the shape ofthe HISMF we redefine the parameters of the Schechter function as explicitfunctions of stellar mass and star formation rate to produce a trivariate fit.This analysis reveals strong trends with SFR. While M_HI^* varies weakly withstellar mass and SFR, alpha is a stronger function of both stellar mass andespecially star formation rate. The HISMF is a crucial tool that can be used toconstrain cosmological galaxy simulations, test observational predictions ofthe HI content of populations of galaxies, and identify galaxies whoseproperties deviate from average trends.

The GALEX Arecibo SDSS Survey VII: The Bivariate Neutral Hydrogen-Stellar Mass Function for Massive Galaxies