ASCA observation of a radio-loud quasar and a new candidate for a cluster of galaxies

Fumie Akimoto, Akihiro Furuzawa, Yuzuru Tawara, Yuichi Kamata, Koujun Yamashita

Research output: Contribution to journalArticle

Abstract

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 ∼ 4×1046 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.

Original languageEnglish
Pages (from-to)677-681
Number of pages5
JournalPublications of the Astronomical Society of Japan
Volume51
Issue number5
DOIs
Publication statusPublished - 01-01-1999

Fingerprint

quasars
radio
galaxies
x rays
galactic clusters
photons
field of view
image analysis
erg
energy bands
power law
luminosity
statistics
radii
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Akimoto, Fumie ; Furuzawa, Akihiro ; Tawara, Yuzuru ; Kamata, Yuichi ; Yamashita, Koujun. / ASCA observation of a radio-loud quasar and a new candidate for a cluster of galaxies. In: Publications of the Astronomical Society of Japan. 1999 ; Vol. 51, No. 5. pp. 677-681.
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ASCA observation of a radio-loud quasar and a new candidate for a cluster of galaxies. / Akimoto, Fumie; Furuzawa, Akihiro; Tawara, Yuzuru; Kamata, Yuichi; Yamashita, Koujun.

In: Publications of the Astronomical Society of Japan, Vol. 51, No. 5, 01.01.1999, p. 677-681.

Research output: Contribution to journalArticle

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