XMM-Newton Observation of the Merging Galaxy Cluster A1644

Details XMM-Newton Observation of the Merging Galaxy Cluster A1644 XMM-Newton Observation of the Merging Galaxy Cluster A1644

2003-08-16

arxiv.org/abs/astro-ph/0308282v2

Astrophys.J.608:179-188,2004

Astronomy and Astrophysics

Astrophysics

17 pages; ApJ, 608, 179; replaced to match accepted ApJ version; I recommend getting the version with uncompromised figures (a

Scientific paper

10.1086/386318

An XMM-Newton imaging spectroscopy analysis of the galaxy cluster A1644 is presented. A1644 is a complex merging system consisting of a main and a sub cluster. A trail of cool, metal-rich gas has been discovered close to the sub cluster. The combination of results from X-ray, optical, and radio data, and a comparison to a hydrodynamical simulation suggest that the sub cluster has passed by the main cluster off-axis and a fraction of its gas has been stripped off during this process. Furthermore, for this merging system, simple effects are illustrated which can affect the use of clusters as cosmological probes. Specifically, double clusters may affect estimates of the cluster number density when treated as a single system. Mergers, as well as cool cores, can alter the X-ray luminosity and temperature measured for clusters, causing these values to differ from those expected in equilibrium.

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