Detection of Intracluster Gas Bulk Velocities in the Perseus and Centaurus Clusters

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dc.creatorDupke, Renato A.
dc.creatorBregman, Joel N.
dc.date2000-11-04
dc.date.accessioned2026-07-07T01:56:25Z
dc.date.available2026-07-07T01:56:25Z
dc.descriptionWe 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.
dc.description12 pages, includes 4 postscript figures, to appear in the proceedings of the IAP2000 meeting "Constructing the Universe with Clusters of Galaxies", July 2000, Paris (France), eds. F. Durret, D. Gerbal
dc.identifierhttps://arxiv.org/abs/astro-ph/0011100
dc.identifierhttp://arxiv.org/abs/astro-ph/0011100
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1991
dc.subjectAstrophysics
dc.titleDetection of Intracluster Gas Bulk Velocities in the Perseus and Centaurus Clusters
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