The FR-I radio galaxies NGC 315 and NGC 4261 observed with ASCA

Yukari Matsumoto, Yasushi Fukazawa, Kazuhiro Nakazawa, Naoko Iyomoto, Kazuo Makishima

研究成果: ジャーナルへの寄稿記事

10 引用 (Scopus)

抄録

FR-I radio galaxies NGC 315 and NGC 4261 were observed in X-rays with ASCA for ∼ 37 ks and ∼ 54 ks, respectively. Hard X-ray emission from a point-like source at the nucleus was detected at a 2-10 keV luminosity of 3.1 × 1041 and 9.2 × 1040 erg s-1, respectively, for assumed distances of 66 Mpc and 29 Mpc (for H0 = 75 km s-1 Mpc-1). The 2-10 keV spectra of NGC 315 and NGC 4261 were both fitted successfully with a power-law of photon index 2.02 ± 0.34 and 1.45 ± 0.11, respectively, plus emission from hot gas. The NGC 315 nucleus is mildly absorbed. No X-ray variability was detected from either object, with typical upper limits of several tens per cent. These results imply the presence of a low-luminosity active galactic nucleus in both galaxies, and reconfirm the previous recognition that the FR-I nuclei are significantly less X-ray luminous than the FR-II ones.

元の言語英語
ページ(範囲)475-481
ページ数7
ジャーナルPublication of the Astronomical Society of Japan
53
発行部数3
出版物ステータス出版済み - 6 25 2001
外部発表Yes

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radio galaxies
radio
nuclei
x rays
luminosity
high temperature gases
active galactic nuclei
erg
point sources
power law
galaxies
photons
gas

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

これを引用

Matsumoto, Y., Fukazawa, Y., Nakazawa, K., Iyomoto, N., & Makishima, K. (2001). The FR-I radio galaxies NGC 315 and NGC 4261 observed with ASCA. Publication of the Astronomical Society of Japan, 53(3), 475-481.

The FR-I radio galaxies NGC 315 and NGC 4261 observed with ASCA. / Matsumoto, Yukari; Fukazawa, Yasushi; Nakazawa, Kazuhiro; Iyomoto, Naoko; Makishima, Kazuo.

:: Publication of the Astronomical Society of Japan, 巻 53, 番号 3, 25.06.2001, p. 475-481.

研究成果: ジャーナルへの寄稿記事

Matsumoto, Y, Fukazawa, Y, Nakazawa, K, Iyomoto, N & Makishima, K 2001, 'The FR-I radio galaxies NGC 315 and NGC 4261 observed with ASCA', Publication of the Astronomical Society of Japan, 巻. 53, 番号 3, pp. 475-481.
Matsumoto, Yukari ; Fukazawa, Yasushi ; Nakazawa, Kazuhiro ; Iyomoto, Naoko ; Makishima, Kazuo. / The FR-I radio galaxies NGC 315 and NGC 4261 observed with ASCA. :: Publication of the Astronomical Society of Japan. 2001 ; 巻 53, 番号 3. pp. 475-481.
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title = "The FR-I radio galaxies NGC 315 and NGC 4261 observed with ASCA",
abstract = "FR-I radio galaxies NGC 315 and NGC 4261 were observed in X-rays with ASCA for ∼ 37 ks and ∼ 54 ks, respectively. Hard X-ray emission from a point-like source at the nucleus was detected at a 2-10 keV luminosity of 3.1 × 1041 and 9.2 × 1040 erg s-1, respectively, for assumed distances of 66 Mpc and 29 Mpc (for H0 = 75 km s-1 Mpc-1). The 2-10 keV spectra of NGC 315 and NGC 4261 were both fitted successfully with a power-law of photon index 2.02 ± 0.34 and 1.45 ± 0.11, respectively, plus emission from hot gas. The NGC 315 nucleus is mildly absorbed. No X-ray variability was detected from either object, with typical upper limits of several tens per cent. These results imply the presence of a low-luminosity active galactic nucleus in both galaxies, and reconfirm the previous recognition that the FR-I nuclei are significantly less X-ray luminous than the FR-II ones.",
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T1 - The FR-I radio galaxies NGC 315 and NGC 4261 observed with ASCA

AU - Matsumoto, Yukari

AU - Fukazawa, Yasushi

AU - Nakazawa, Kazuhiro

AU - Iyomoto, Naoko

AU - Makishima, Kazuo

PY - 2001/6/25

Y1 - 2001/6/25

N2 - FR-I radio galaxies NGC 315 and NGC 4261 were observed in X-rays with ASCA for ∼ 37 ks and ∼ 54 ks, respectively. Hard X-ray emission from a point-like source at the nucleus was detected at a 2-10 keV luminosity of 3.1 × 1041 and 9.2 × 1040 erg s-1, respectively, for assumed distances of 66 Mpc and 29 Mpc (for H0 = 75 km s-1 Mpc-1). The 2-10 keV spectra of NGC 315 and NGC 4261 were both fitted successfully with a power-law of photon index 2.02 ± 0.34 and 1.45 ± 0.11, respectively, plus emission from hot gas. The NGC 315 nucleus is mildly absorbed. No X-ray variability was detected from either object, with typical upper limits of several tens per cent. These results imply the presence of a low-luminosity active galactic nucleus in both galaxies, and reconfirm the previous recognition that the FR-I nuclei are significantly less X-ray luminous than the FR-II ones.

AB - FR-I radio galaxies NGC 315 and NGC 4261 were observed in X-rays with ASCA for ∼ 37 ks and ∼ 54 ks, respectively. Hard X-ray emission from a point-like source at the nucleus was detected at a 2-10 keV luminosity of 3.1 × 1041 and 9.2 × 1040 erg s-1, respectively, for assumed distances of 66 Mpc and 29 Mpc (for H0 = 75 km s-1 Mpc-1). The 2-10 keV spectra of NGC 315 and NGC 4261 were both fitted successfully with a power-law of photon index 2.02 ± 0.34 and 1.45 ± 0.11, respectively, plus emission from hot gas. The NGC 315 nucleus is mildly absorbed. No X-ray variability was detected from either object, with typical upper limits of several tens per cent. These results imply the presence of a low-luminosity active galactic nucleus in both galaxies, and reconfirm the previous recognition that the FR-I nuclei are significantly less X-ray luminous than the FR-II ones.

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