SIMBAD references

2020A&A...642A.175B - Astronomy and Astrophysics, volume 642A, 175-175 (2020/10-1)

The NIBLES bivariate luminosity-H I mass distribution function revised using Arecibo follow-up observations.


Abstract (from CDS):

We present a modified optical luminosity-HI mass bivariate luminosity function based on HI line observations from the NancayInterstellar Baryons Legacy Extragalactic Survey (NIBLES), including data from our new, four times more sensitive follow-up HI line observations obtained with the Arecibo radio telescope. The follow-up observations were designed to probe the underlying HI mass distribution of the NIBLES galaxies that were undetected or marginally detected in HI at the Nancay Radio Telescope. Our total follow-up sample consists of 234 galaxies, and it spans the entire luminosity and color range of the parent NIBLES sample of 2600 nearby (900<cz<12000km/s) SDSS galaxies. We incorporated the follow-up data into the bivariate analysis by scaling the NIBLES undetected fraction by an Arecibo-only distribution. We find the resulting increase in low HI mass-to-light ratio densities to be about 10% for the bins -1.0≥log(MHI/M/Lr/L)≥-0.5, which produces an increased HI mass function (HIMF) low mass slope of α=-1.14±0.07, being slightly shallower than the values of -1.35±0.05 obtained by recent blind HI surveys. Applying the same correction to the optically corrected bivariate luminosity function from our previous paper produces a larger density increase of about 0.5 to 1 dex in the lowest HI mass-to-light ratio bins for a given luminosity while having a minimal effect on the resulting HIMF low mass slope, which still agrees with blind survey HIMFs. This indicates that while low HI-mass-to-light ratio galaxies do not contribute much to the one-dimensional HIMF, their inclusion has a significant impact on the densities in the two-dimensional distribution.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: statistics - galaxies: general - galaxies: formation - galaxies: dwarf - radio lines: galaxies

VizieR on-line data: <Available at CDS (J/A+A/642/A175): tablea1.dat tablea2.dat fits/*>

Simbad objects: 133

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