H i-deficient galaxies in intermediate-density environments

Abstract:

Observations show that spiral galaxies in galaxy clusters tend to have on average less neutral hydrogen (H i) than galaxies of the same type and size in the field. There is accumulating evidence that such H i-deficient galaxies are also relatively frequent in galaxy groups. An important question is that which mechanisms are responsible for the gas deficiency in galaxy groups. To gain a better understanding of how environment affects the gas content of galaxies, we identified a sample of six H i-deficient galaxies from the H i Parkes All Sky Survey (HIPASS) using H i-optical scaling relations. One of the galaxies is located in the outskirts of the Fornax cluster, four are in loose galaxy groups and one is in a galaxy triplet. We present new high-resolution H i observations with the Australia Telescope Compact Array (ATCA) of these galaxies. We discuss the possible cause of H i-deficiency in the sample based …

Año de publicación:

2016

Keywords:

Fuente:

google