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

作者：Yamauchi Shigeo^*; Ueno Masaru; Bamba Aya; Koyama Katsuji

来源：Publications of the Astronomical Society of Japan, 2010, 62(2): 219-224.

DOI：10.1093/pasj/62.2.219

• galaxies: intergalactic medium
• X-rays: galaxies: clusters
• X-rays: individual (2XMM J045637.2+522411)

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.

• 出版日期2010