Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium

Details Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium

2006-09-20

arxiv.org/abs/astro-ph/0609560v1

Astronomy and Astrophysics

Astrophysics

9 pages, 4 figures. Accepted for publication in PASJ. Version with high-quality color figures at http://cosmic.riken.jp/ota/

Scientific paper

The Centaurus cluster (z=0.0104) was observed with the X-ray Imaging Spectrometer (XIS) onboard the Suzaku X-ray satellite in three pointings, one centered on the cluster core and the other two offset by +-8' in declination. To search for possible bulk motions of the intracluster medium, the central energy of He-like Fe-K line (at a rest-frame energy of 6.7 keV) was examined to look for a positional dependence. Over spatial scales of 50 kpc to 140 kpc around the cluster core, the central line energy was found to be constant within the calibration error of 15 eV. The 90% upper limit on the line-of-sight velocity difference is |Delta_v|< 1400 km/s, giving a tighter constraint than previous measurements. The significant velocity gradients inferred from a previous Chandra study were not detected between two pairs of rectangular regions near the cluster core. These results suggest that the bulk velocity does not largely exceed the thermal velocity of the gas in the central region of the Centaurus cluster. The mean redshift of the intracluster medium was determined to be 0.0097, in agreement with the optical redshift of the cluster within the calibration uncertainty. Implications of the present results for the estimation of the cluster mass are briefly discussed.

Affiliated with

Also associated with

No associations

Rating

Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium 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 Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-350267