Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-28
Astrophys.J.646:143-160,2006
Astronomy and Astrophysics
Astrophysics
18 pages, ApJ, 646, 143, 2006
Scientific paper
10.1086/504697
We present the results of the 2-dimensional XMM-Newton Group Survey (2dXGS), an archival study of nearby galaxy groups. In this paper we consider eleven nearby systems (z<0.012) in Mulchaey et al. (2003), which span a broad range in X-ray luminosity from 10^40 to 10^43 ergs/s. We measure the iron abundance and temperature distribution in these systems and derive pressure and entropy maps. We find statistically significant evidence for structure in the entropy and pressure of the gas component of seven groups on the 10-20% level. The XMM-Newton data for the three groups with best statistics also suggest patchy metalicity distributions within the central 20--50 kpc of the brightest group galaxy, probed with 2-10 kpc resolution. This provides insights into the processes associated with thermalization of the stellar mass loss. Analysis of the global properties of the groups reveals a subclass of X-ray faint groups, which are characterized by both higher entropy and lower pressure. We suggest that the merger history of the central elliptical is responsible for both the source and the observed thermodynamical properties of the hot gas of the X-ray faint groups.
Davis David S.
Finoguenov Alexis
Mulchaey John S.
Zimer Marc
No associations
LandOfFree
The Two-dimensional XMM-Newton Group Survey: z<0.012 groups does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Two-dimensional XMM-Newton Group Survey: z<0.012 groups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Two-dimensional XMM-Newton Group Survey: z<0.012 groups will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-350249