Suzaku Observations of the Merging Cluster Abell 85: Temperature Map and Impact Direction

Details Suzaku Observations of the Merging Cluster Abell 85: Temperature Map and Impact Direction Suzaku Observations of the Merging Cluster Abell 85: Temperature Map and Impact Direction

2010-06-22

arxiv.org/abs/1006.4328v1

Publications of the Astronomical Society of Japan, 2010, Vol. 62 pp. 743-754

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

21 pages, 10 figure, accepted for publication in PASJ. Paper with high resolution figures is available at http://www.adc.nao

Scientific paper

To investigate the present situation of the merging in the southern outer region of Abell 85, we carried out long (~100 ks) observations with Suzaku, and produced an X-ray hardness ratio map. We found a high hardness ratio peak in the east side of a subcluster located in the south of the cluster; an X-ray spectrum of the region including this peak indicates a high temperature of ~8.5 keV. This hot spot has not been reported so far. We consider that this hot spot is a postshock region produced by the infall of the subcluster from the southwest. By using the Rankine--Hugoniot jump conditions for shocks, the Mach number and the infall velocity of the subcluster are obtained as 1.5 +/- 0.2 and 1950^{+290}_{-280} km s^{-1}, respectively, in the case of merging with the subcluster from the southwest direction. By using the redshift difference between the A 85 and the subcluster obtained from optical observations, the angle between the line of sight and the direction of the motion of the subcluster is estimated to be 75^{+7}_{-8} degrees. We estimate the kinetic energy of the subcluster and the energy used for intracluster medium (ICM) heating to be ~10^{63} and \lesssim 8 \times 10^{60} erg, respectively. This shows that the deceleration of the subcluster by ICM heating has been negligibly small.

Affiliated with

Also associated with

No associations

Rating

Suzaku Observations of the Merging Cluster Abell 85: Temperature Map and Impact Direction 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 Suzaku Observations of the Merging Cluster Abell 85: Temperature Map and Impact Direction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Suzaku Observations of the Merging Cluster Abell 85: Temperature Map and Impact Direction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-108540