Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..237i&link_type=abstract
Publications of the Astronomical Society of Japan, v.48, p.237-248.
Astronomy and Astrophysics
Astronomy
92
Galaxies: Active, Galaxies: Individual (M81), Galaxies: X-Rays
Scientific paper
Due to the appearance of SN 1993J, the region of M81 (NGC 3031) was observed with ASCA ten times between 1993 April and 1995 April. Data from eight of these observations have been used to study the 0.5--10 keV spectral and temporal properties of the source designated X-5, coincident with the M81 nucleus. The 2--10 keV luminosity of X-5 varied by a factor of 1.7 over a period of two years, around a mean of ~ 2times 10(40) erg s(-1) . Variations by ~ 20% on a time scale of one day were also detected. The average spectrum of X-5 can be represented in the 2--10 keV range by a power-law continuum of the photon index, Gamma = 1.85+/- 0.04, and a relatively low intrinsic absorption column of N_H ~ 1times 10(21) cm(-2) . In the soft (< 2 keV) energy range, an additional thermal component with a temperature of 0.6--0.8 keV has been detected. An apparently broad or complex Fe-K emission line centered at 6.6--6.7 keV was also detected at an equivalent width of 170 +/- 60 eV\@. These results indicate that the M81 nucleus is a low-luminosity active galactic nucleus, and suggest that similar objects are relatively numerous. A comparison is made between the nucleus of M81 and those of Seyfert galaxies.
Hayashida Kiyoshi
Inoue Hajime
Ishisaki Yoshitaka
Iyomoto Naoko
Kohmura Yoshiki
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