Velocity Gradients in the Intracluster Gas of the Perseus Cluster

Details Velocity Gradients in the Intracluster Gas of the Perseus Cluster Velocity Gradients in the Intracluster Gas of the Perseus Cluster

2000-09-26

arxiv.org/abs/astro-ph/0009429v1

Astronomy and Astrophysics

Astrophysics

19 pages, 6 figures, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/318393

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 at a position angle of \~135 deg, which is ~ 45 deg discrepant with the major axis of the X-ray elongation. The radial velocity difference is found to be greater than 1000 km/s/Mpc at the 90% confidence level. Simultaneous fittings of GIS 2 & 3 indicate that the velocity gradient is significant at the 95% confidence level and the F-test rules out constant velocities at the 99% level. Intrinsic short and long term variations of gain are unlikely (P < 0.03) to explain the velocity discrepancies.

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