Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..677a&link_type=abstract
Publications of the Astronomical Society of Japan, v.51, p.677.
Astronomy and Astrophysics
Astronomy
Galaxies: Clusters: Individual (Cl 0107+31), Galaxies: Individual (Nrao 58), X-Rays: Galaxies
Scientific paper
During an X-ray observation of the distant galaxy cluster CL 0107+31 (z = 0.69) with ASCA, an extended X-ray source was detected in the field of view. Based on an image analysis in two different energy bands of 1-3 keV and 3-10 keV, we found that this source consists of a hard point-like component and an additional soft diffuse X-ray source extended over >= 3' in radius. However, due to poor photon statistics, we could not distinguish whether their X-ray spectra are thermal or non-thermal. The peak position of the central X-ray source coincides with a radio-loud quasar, NRAO 58. NRAO 58 is found to have a power-law spectrum with a photon index 1.6+0.3-0.2 and a (2-10 keV) luminosity of ~ 4*E46 erg s-1 (in the quasar rest frame). The extended component is likely to be a candidate for a nearby galaxy group which accidentally coincides with the quasar.
Akimoto Fumie
Furuzawa Akihiro
Kamata Yuichi
Tawara Yuzuru
Yamashita Koujun
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