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

doi:10.1093/pasj/51.5.677

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 journal › Article › peer-review

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 language	English
Pages (from-to)	677-681
Number of pages	5
Journal	Publications of the Astronomical Society of Japan
Volume	51
Issue number	5
DOIs	https://doi.org/10.1093/pasj/51.5.677
Publication status	Published - 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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@article{d688570bde0944858463b99aecc65975,

title = "ASCA observation of a radio-loud quasar and a new candidate for a cluster of galaxies",

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.",

author = "Fumie Akimoto and Akihiro Furuzawa and Yuzuru Tawara and Yuichi Kamata and Koujun Yamashita",

year = "1999",

doi = "10.1093/pasj/51.5.677",

language = "English",

volume = "51",

pages = "677--681",

journal = "Publications of the Astronomical Society of Japan",

issn = "0004-6264",

publisher = "Astronomical Society of Japan",

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TY - JOUR

T1 - ASCA observation of a radio-loud quasar and a new candidate for a cluster of galaxies

AU - Akimoto, Fumie

AU - Furuzawa, Akihiro

AU - Tawara, Yuzuru

AU - Kamata, Yuichi

AU - Yamashita, Koujun

PY - 1999

Y1 - 1999

N2 - 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.

AB - 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.

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DO - 10.1093/pasj/51.5.677

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JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - 5

ER -

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

Abstract

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