AAS 201st Meeting, January, 2003
Session 14. Galaxy - Contents
Poster, Monday, January 6, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[14.04] XMM-Newton Observations of NGC 507: \\ Over-Density of Peripheral Sources and Metal Abundances

G. Fabbiano, D-W. Kim, N. Brickhouse (Harvard-Smithsonian CfA)

We report the results of XMM-Newton X-ray observations of NGC 507. We have confirmed the existence of over-density of X-ray sources at the periphery of the X-ray halo in NGC 507, which was first suggested by the ROSAT PSPC data (Kim and Fabbiano 1995). Some of them appear to be extended, although this needs to be confirmed. Among the bright sources, some are extremely hard while others are very soft, possibly indicating that they consist of mixed populations. The possibly nature of these sources will be discussed. We have also confirmed the off-center 2nd peak, possibly interacting with the radio lobe and discovered a sharp discontinuity at ~2' southeast from the center. We note that most of the Chandra sources are within the X-ray bright, extended halo and therefore are not individually detected in the XMM-Newton data. Also we discuss metal abundances (Fe and alpha-element separately) in the X-ray halo obtained by applying various emission models (taking into account those Chandra sources within the X-ray halo) and their implications in terms of type I/II SN rates.

We acknowledge the financial support of NASA Grant NAG5-9965.

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