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ASCA observations of the warm absorber in MCG-6-30-15: The discovery of a change in column densityWe report the first X-ray observations of the Seyfert 1 galaxy MCG-6-30-15 obtained at medium spectral resolution. The partially-ionized, 'warm' absorber is resolved and shown to be due to O VII and O VIII. The main absorption edge agrees with that of O VII at the redshift of the galaxy to within 1%. The column density of the absorbing material is greater by a factor of 2 in the first of our two obsevations, which were 3 weeks apart, while the mean flux is slightly lower and the ionization parameter slightly higher. We also discuss the flourescent iron emssion line seen in the source, which is at 6.40 keV. The line is significantly broadened, with a Full Width at Half Maximum (FWHM) of about 0.4 keV.
Document ID
19950033363
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fabian, Andrew C.
(Institute of Space and Astronautical Science Sgamihara, Japan)
Kunieda, Hideyo
(Nagoya Univ. Nagoya, Japan)
Inoue, Shigeru
(Nagoya Univ. Nagoya, Japan)
Matsuoka, Masaru
(Institute of Physical and Chemical Research (RIKEN) Hirosawa, Wako, Japan)
Mihara, Tatehiro
(Institute of Physical and Chemical Research (RIKEN) Hirosawa, Wako, Japan)
Miyamoto, Sigenori
(Osaka Univ. Osaka, Japan)
Otani, Chiko
(Institute of Space and Astronautical Science Sgamihara, Japan)
Ricker, George
(MIT, Cambridge, MA United States)
Tanaka, Yasuo
(Institute of Space and Astronautical Science Sgamihara, Japan)
Yamauchi, Makoto
(Institute of Physical and Chemical Research (RIKEN) Hirosawa, Wako, 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: 3
ISSN: 0004-6264
Subject Category
Astrophysics
Accession Number
95A64962
Distribution Limits
Public
Copyright
Other

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