Open AccessH i imaging of galaxies in X‐ray bright groups
Author(s) -
Sengupta Chandreyee,
Balasubramanyam Ramesh,
Dwarakanath K. S.
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2007.11748.x
Subject(s) - physics , astrophysics , galaxy group , intracluster medium , galaxy cluster , velocity dispersion , elliptical galaxy , galaxy , x ray , astronomy , radio galaxy , ram pressure , galaxy groups and clusters , cluster (spacecraft) , star formation , optics , computer science , programming language
Environment plays an important role in the evolution of the gas contents of galaxies. Gas deficiency of cluster spirals and the role of the hot intracluster medium in stripping gas from these galaxies is a well‐studied subject. Loose groups with diffuse X‐ray emission from the intragroup medium (IGM) offer an intermediate environment between clusters and groups without a hot IGM. These X‐ray bright groups have smaller velocity dispersion and lower temperature than clusters, but higher IGM density than loose groups without diffuse X‐ray emission. A single‐dish comparative study of loose groups with and without diffuse X‐ray emission from the IGM, showed that the galaxies in X‐ray bright groups have lost more gas on average than the galaxies in non X‐ray bright groups. In this paper we present GMRT H i observations of 13 galaxies from four X‐ray bright groups: NGC 5044, 720, 1550 and IC1459. The aim of this work is to study the morphology of H i in these galaxies and to see if the hot IGM has in any way affected their H i content or distribution. In addition to disturbed H i morphology, we find that most galaxies have shrunken H i discs compared to the field spirals. This indicates that IGM‐assisted stripping processes like ram pressure may have stripped gas from the outer edges of the galaxies.