SIMBAD references

2010ApJ...715L...1M - Astrophys. J., 715, L1-L5 (2010/May-3)

Hot gas halos in early-type field galaxies.

MULCHAEY J.S. and JELTEMA T.E.

Abstract (from CDS):

We use Chandra and XMM-Newton to study the hot gas content in a sample of field early-type galaxies. We find that the LX-LK relationship is steeper for field galaxies than for comparable galaxies in groups and clusters. The low hot gas content of field galaxies with LK{lap} L{sstarf}suggests that internal processes such as supernovae-driven winds or active galactic nucleus feedback expel hot gas from low-mass galaxies. Such mechanisms may be less effective in groups and clusters where the presence of an intragroup or intracluster medium can confine outflowing material. In addition, galaxies in groups and clusters may be able to accrete gas from the ambient medium. While there is a population of LK{lap} L{sstarf} galaxies in groups and clusters that retain hot gas halos, some galaxies in these rich environments, including brighter galaxies, are largely devoid of hot gas. In these cases, the hot gas halos have likely been removed via ram pressure stripping. This suggests a very complex interplay between the intragroup/intracluster medium and hot gas halos of galaxies in rich environments, with the ambient medium helping to confine or even enhance the halos in some cases and acting to remove gas in others. In contrast, the hot gas content of more isolated galaxies is largely a function of the mass of the galaxy, with more massive galaxies able to maintain their halos, while in lower mass systems the hot gas escapes in outflowing winds.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: groups: general - galaxies: halos - X-rays: galaxies

Simbad objects: 23

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2010ApJ...715L...1M and select 'bookmark this link' or equivalent in the popup menu


2020.10.27-13:18:03

© Université de Strasbourg/CNRS

    • Contact