New H i scaling relations to probe the H i content of galaxies via global H i-deficiency maps

Abstract:

We present new multiwavelength scaling relations between the neutral hydrogen content (H i) and the stellar properties of nearby galaxies selected from the H i Parkes All-Sky Survey (HIPASS). We use these new scaling relations to investigate the environmental dependence of the H i content of galaxies. We find that galaxies in high-density environments tend to have on average less H i than galaxies with the same stellar mass in low-density environments. Our new H i scaling relations allow us to identify individual galaxies, as well as group/cluster environments, that have an ‘anomalous’ H i content. We map the global distribution of H i-deficient and H i-excess galaxies on the sky and compare it to the large-scale structure of galaxies. We find galaxy clusters to be H i deficient, and we identify that the regions surrounding clusters tend to be H i excess. Finally, we demonstrate the potential of using H …

Año de publicación:

2014

Keywords:

Fuente:

google