Home List of Titles The clustering of galaxies as a function of their photometrically estimated atomic gas content
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/229484
- The clustering of galaxies as a function of their photometrically estimated atomic gas content
- Li, Cheng; Kauffmann, Guinevere; Fu, Jian; Wang, Jing; Catinella, Barbara; Fabello, Silvia; Schiminovich, David; Zhang, Wei
- We introduce a new photometric estimator of the HI mass fraction (M_HI/M_*) in local galaxies, which is a linear combination of four parameters: stellar mass, stellar surface mass density, NUV-r colour, and g-i colour gradient. It is calibrated using samples of nearby galaxies (0.025<z<0.05) with HI line detections from the GASS and ALFALFA surveys, and it is demonstrated to provide unbiased M_HI/M_* estimates even for HI-rich galaxies. We apply this estimator to a sample of ~24,000 galaxies from the SDSS/DR7 in the same redshift range. We then bin these galaxies by stellar mass and HI mass fraction and compute projected two point cross-correlation functions with respect to a reference galaxy sample. Results are compared with predictions from current semi-analytic models of galaxy formation. The agreement is good for galaxies with stellar masses larger than 10^10 M_sun, but not for lower mass systems. We then extend the analysis by studying the bias in the clustering of HI-poor or HI-rich galaxies with respect to galaxies with normal HI content on scales between 100 kpc and ~5 Mpc. For the HI-deficient population, the strongest bias effects arise when the HI-deficiency is defined in comparison to galaxies of the same stellar mass and size. This is not reproduced by the semi-analytic models, where the quenching of star formation in satellites occurs by 'starvation' and does not depend on their internal structure. HI-rich galaxies with masses greater than 10^10 M_sun are found to be anti-biased compared to galaxies with 'normal' HI content. Interestingly, no such effect is found for lower mass galaxies.
- Publication type
- Journal article
- Monthly Notices of the Royal Astronomical Society, Vol. 424, no. 2 (Aug 2012), pp. 1471-1482
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Clusters; Cosmology observations; Distances; Dark matter; Galaxies; GALEX Arecibo SDSS Survey; GASS; Large-scale structure of Universe; Red shift; Sloan Digital Sky Survey
- Publisher URL
- Copyright © 2012 The Authors. Journal copyright © 2012 Royal Astronomical Society.
- Peer reviewed