Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-04
Astronomy and Astrophysics
Astrophysics
12 pages, includes 4 postscript figures, to appear in the proceedings of the IAP2000 meeting "Constructing the Universe with C
Scientific paper
We report the results of spatially resolved X-ray spectroscopy of 8 different ASCA pointings distributed symmetrically around the center of the Perseus cluster. The outer region of the intracluster gas is roughly isothermal, with temperature ~6-7 keV, and metal abundance ~ 0.3 Solar. Spectral analysis of the central pointing is consistent with the presence of a cooling flow and a central metal abundance gradient. A significant velocity gradient is found along an axis highly discrepant with the major axis of the X-ray elongation. The radial velocity difference is found to be greater than 1000 km/sMpc at the 90% confidence level. Simultaneous fittings of GIS 2 & 3 indicate that two symmetrically opposed regions have different radial velocities at the 95% confidence level and the F-test rules out constant velocities for these regions at the 99% level. Intrinsic short and long term variations of gain are unlikely (P < 0.03) to explain the velocity discrepancies. We also report the preliminary results of a similar analysis carried out for the Centaurus cluster, where long-exposure SIS data is available. We also find a significant velocity gradient near the central regions (3'-8') of Centaurus. If attributed to bulk rotation the correspondent circular velocity is ~1500+-150km/s (at 90% confidence). The line of maximum velocity gradient in Centaurus is near-perpendicular to the infalling galaxy group associated with NGC 4709.
Bregman Joel N.
Dupke Renato A.
No associations
LandOfFree
Detection of Intracluster Gas Bulk Velocities in the Perseus and Centaurus Clusters 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 Detection of Intracluster Gas Bulk Velocities in the Perseus and Centaurus Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of Intracluster Gas Bulk Velocities in the Perseus and Centaurus Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-600934