Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46l.141f&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 4, p. L141-L146
Astronomy and Astrophysics
Astronomy
33
Abundance, Active Galactic Nuclei, Iron, K Lines, Seyfert Galaxies, X Ray Astronomy, X Ray Fluorescence, X Ray Spectra, Imaging Spectrometers, Rosat Mission, Satellite-Borne Instruments, X Ray Telescopes
Scientific paper
A hard X-ray source with a 2-10 keV flux of approximately 6 x 10-13 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 (NH approx. = 6 x 1023/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 1042 ergs/s.
Ebisawa Ken
Fabian Andrew C.
Fukazawa Yasushi
Gendreau Keith Charles
Ikebe Yasushi
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