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The fluorescence-dominated X-ray spectrum of the spiral galaxy NGC 6552A hard X-ray source with a 2-10 keV flux of approximately 6 x 10(exp -13) ergs/sec/sq cm was detected with ASCA in the north ecliptic pole region. It is identified with the spiral galaxy NGC 6552 at a redshift of z = 0.026, which is optically classified as a Seyfert 2 galaxy. The X-ray spectrum consists of a series of atomic K-emission lines from (nearly-) neutral species of at least seven abundant elements, and a heavily absorbed (N(sub H) approx. = 6 x 10(exp 23)/sq cm) hard continuum. The iron line has an equivalent width as large as approximately 0.9 keV. Our results show that NGC 6552 is an extreme type 2 Seyfert galaxy, in which the fluorescent lines are produced when hard X-rays from a hidden active nucleus are reflected off thick cool matter into our line of sight. The intrinsic 2-10 keV luminosity of the nucleus is estimated to be at least 6 x 10(exp 42) ergs/s.
Document ID
19950036816
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fukazawa, Yasushi
(Univ. of Tokyo Bunkyo, Tokyo, Japan)
Makishima, Kazuo
(Univ. of Tokyo Bunkyo, Tokyo, Japan)
Ebisawa, Ken
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fabian, Andrew C.
(Univ. of Cambridge Cambridge, United Kingdom)
Gendreau, Keith C.
(Massachusetts Inst. of Technology, Cambridge, MA United States)
Ikebe, Yasushi
(Univ. of Tokyo Bunkyo, Tokyo, Japan)
Iwasawa, Kazushi
(Nagoya Univ. Chikusa, Nagoya, Japan)
Kii, Tsuneo
(Inst. of Space and Astronautical Science Kanagawa, Japan)
Mushotzky, Richard F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ohashi, Takaya
(Tokyo Metropolitan Univ. Tokyo, Japan)
Date Acquired
August 16, 2013
Publication Date
January 1, 1994
Publication Information
Publication: PASJ: Publications of the Astronomical Society of Japan
Volume: 46
Issue: 4
ISSN: 0004-6264
Subject Category
Astronomy
Accession Number
95A68415
Distribution Limits
Public
Copyright
Other

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