Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405..179b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 1, p. 179-185.
Astronomy and Astrophysics
Astronomy
13
Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Accretion Disks, Astronomical Models, Line Spectra
Scientific paper
Observations of the Seyfert 2 galaxy NGC 5506 obtained by Ginga in 1991 July 6-10, are presented. In addition to an iron emission line around 6.4 keV, soft excess emission below 3 keV and a hard tail-like feature are detected. On one episode on July 9, the spectrum softened, over a 5 hr time scale, to a maximum level after which it returned to the level seen on the other observation days. On July 6 and 10, the covering fraction was about 80 percent but on July 9 this value declined to a minimum value of about 60 percent. While we do not rule out the presence of ionized matter, the lack of correlation of the spectral softness with the continuum flux rules out models based on photoionization as the softness variability mechanism. It is suggested that this mechanism resides in the inner accretion disk where the dip in the apparent covering fraction is due to instabilities in the accretion flow.
Bond Ian A.
Matsuoka Masaru
Yamauchi Makoto
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