A New Candidate of a Cluster of Galaxies, 2XMM J045637.2+522411

Details A New Candidate of a Cluster of Galaxies, 2XMM J045637.2+522411 A New Candidate of a Cluster of Galaxies, 2XMM J045637.2+522411

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pasj...62..219y&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.62, No.2, pp.219--224

Astronomy and Astrophysics

Astronomy

1

Galaxies: Intergalactic Medium, X-Rays: Galaxies: Clusters, X-Rays: Individual (2Xmm J045637.2+522411)

Scientific paper

We present XMM-Newton and Suzaku results of an X-ray source, 2XMM J045637.2+522411, found during an observation of a galactic supernova remnant (SNR), G156.2+5.7. By comparing its radial profile with the point-spread function, we found that 2XMM J045637.2+522411 is an extended source. X-ray spectra exhibited a line-like structure at 5.7-5.8 keV. Since no abundant element emits an X-ray line at 5-6 keV in the rest-frame, and the most intense emission line in the 5-7 keV energy band is a Fe-K line, the line is likely to be a redshifted Fe-K line. The overall spectra can be represented by a thin-thermal plasma model with a temperature of 3-4 keV and a redshift of 0.15-0.17. No intensity variation was found in the light curve. The observational results indicate that 2XMM J045637.2+522411 is likely to be a cluster of galaxies.

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