Fe K emission from the hidden quasar IRAS P09104+4109

A. C. Fabian; Y. Shioya; K. Iwasawa; K. Nandra; C. Crawford; R. Johnstone; H. Kunieda; R. Mcmahon; K. Makishima; T. Murayama; T. Ohashi; Y. Tanaka; Y. Taniguch̀i; Y. Terashima

doi:10.1086/187630

Fe K emission from the hidden quasar IRAS P09104+4109

A. C. Fabian, Y. Shioya, K. Iwasawa, K. Nandra, C. Crawford, R. Johnstone, H. Kunieda, R. Mcmahon, K. Makishima, T. Murayama, T. Ohashi, Y. Tanaka, Y. Taniguch̀i, Y. Terashima

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

We report the discovery of a strong Fe K line in the ASCA spectrum of the infrared-luminous galaxy IRAS P09104+4109 at a redshift z = 0.442. It is the most distant Fe K emission line detected so far. The large equivalent width (EW ∼ 450 eV) and X-ray continuum spectrum, which has Γ ≈ 2.0 with little absorption, favors a model in which the observed X-rays are scattered into our line of sight from a hidden quasar. Previous work has shown that the source has strong narrow emission lines and a highly polarized continuum in the optical and a strong infrared excess, similar to Seyfert 2 galaxies. The observed X-ray luminosity is L_X ≈ 2 x 10⁴⁵ ergs s^-1 in the rest frame 2-10 keV band; the large obscuration suggested by the optical and infrared studies implies that the hidden quasar has an intrinsic luminosity of L_Bol = 5 x 10⁴⁷ ergs s^-1. Our results indicate that IRAS P09104+4109 is the prototype of a new class of Seyfert 2 nuclei, which emit at quasar luminosities.

Original language	English
Pages (from-to)	L51-L54
Journal	Astrophysical Journal
Volume	436
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/187630
Publication status	Published - 1994 Nov 20

Keywords

Galaxies: active
X-rays: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Fe K emission from the hidden quasar IRAS P09104+4109. / Fabian, A. C.; Shioya, Y.; Iwasawa, K.; Nandra, K.; Crawford, C.; Johnstone, R.; Kunieda, H.; Mcmahon, R.; Makishima, K.; Murayama, T.; Ohashi, T.; Tanaka, Y.; Taniguch̀i, Y.; Terashima, Y.

In: Astrophysical Journal, Vol. 436, No. 1 PART 2, 20.11.1994, p. L51-L54.

Research output: Contribution to journal › Article › peer-review

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title = "Fe K emission from the hidden quasar IRAS P09104+4109",

abstract = "We report the discovery of a strong Fe K line in the ASCA spectrum of the infrared-luminous galaxy IRAS P09104+4109 at a redshift z = 0.442. It is the most distant Fe K emission line detected so far. The large equivalent width (EW ∼ 450 eV) and X-ray continuum spectrum, which has Γ ≈ 2.0 with little absorption, favors a model in which the observed X-rays are scattered into our line of sight from a hidden quasar. Previous work has shown that the source has strong narrow emission lines and a highly polarized continuum in the optical and a strong infrared excess, similar to Seyfert 2 galaxies. The observed X-ray luminosity is LX ≈ 2 x 1045 ergs s-1 in the rest frame 2-10 keV band; the large obscuration suggested by the optical and infrared studies implies that the hidden quasar has an intrinsic luminosity of LBol = 5 x 1047 ergs s-1. Our results indicate that IRAS P09104+4109 is the prototype of a new class of Seyfert 2 nuclei, which emit at quasar luminosities.",

keywords = "Galaxies: active, X-rays: galaxies",

author = "Fabian, {A. C.} and Y. Shioya and K. Iwasawa and K. Nandra and C. Crawford and R. Johnstone and H. Kunieda and R. Mcmahon and K. Makishima and T. Murayama and T. Ohashi and Y. Tanaka and Y. Taniguc{\`h}i and Y. Terashima",

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T1 - Fe K emission from the hidden quasar IRAS P09104+4109

AU - Fabian, A. C.

AU - Shioya, Y.

AU - Iwasawa, K.

AU - Nandra, K.

AU - Crawford, C.

AU - Johnstone, R.

AU - Kunieda, H.

AU - Mcmahon, R.

AU - Makishima, K.

AU - Murayama, T.

AU - Ohashi, T.

AU - Tanaka, Y.

AU - Taniguch̀i, Y.

AU - Terashima, Y.

PY - 1994/11/20

Y1 - 1994/11/20

N2 - We report the discovery of a strong Fe K line in the ASCA spectrum of the infrared-luminous galaxy IRAS P09104+4109 at a redshift z = 0.442. It is the most distant Fe K emission line detected so far. The large equivalent width (EW ∼ 450 eV) and X-ray continuum spectrum, which has Γ ≈ 2.0 with little absorption, favors a model in which the observed X-rays are scattered into our line of sight from a hidden quasar. Previous work has shown that the source has strong narrow emission lines and a highly polarized continuum in the optical and a strong infrared excess, similar to Seyfert 2 galaxies. The observed X-ray luminosity is LX ≈ 2 x 1045 ergs s-1 in the rest frame 2-10 keV band; the large obscuration suggested by the optical and infrared studies implies that the hidden quasar has an intrinsic luminosity of LBol = 5 x 1047 ergs s-1. Our results indicate that IRAS P09104+4109 is the prototype of a new class of Seyfert 2 nuclei, which emit at quasar luminosities.

AB - We report the discovery of a strong Fe K line in the ASCA spectrum of the infrared-luminous galaxy IRAS P09104+4109 at a redshift z = 0.442. It is the most distant Fe K emission line detected so far. The large equivalent width (EW ∼ 450 eV) and X-ray continuum spectrum, which has Γ ≈ 2.0 with little absorption, favors a model in which the observed X-rays are scattered into our line of sight from a hidden quasar. Previous work has shown that the source has strong narrow emission lines and a highly polarized continuum in the optical and a strong infrared excess, similar to Seyfert 2 galaxies. The observed X-ray luminosity is LX ≈ 2 x 1045 ergs s-1 in the rest frame 2-10 keV band; the large obscuration suggested by the optical and infrared studies implies that the hidden quasar has an intrinsic luminosity of LBol = 5 x 1047 ergs s-1. Our results indicate that IRAS P09104+4109 is the prototype of a new class of Seyfert 2 nuclei, which emit at quasar luminosities.

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KW - X-rays: galaxies

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