Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-06
Astrophys.J. 503 (1998) 212
Astronomy and Astrophysics
Astrophysics
15 pages, 5 figures, to appear in The Astrophysical Journal
Scientific paper
10.1086/305979
We present the results of an ASCA observation of the LINER NGC 4579. A point-like X-ray source is detected at the nucleus with a 2-10 keV luminosity of 1.5x10^41 ergs/s assuming a distance of 16.8 Mpc. The X-ray spectrum is represented by a combination of a power-law with a photon index of ~1.7 and soft thermal component with kT~0.9 keV. An iron K emission line is detected at 6.73+/-0.13 keV (rest frame) with an equivalent width of 490 +180/-190 eV and is statistically significant at more than 99.9 % confidence. The line center energy is consistent with Helium-like iron and is significantly higher than 6.4 keV which is expected from fluorescence by "cold" (or a lower ionization state of) iron. The iron line profile shows no significant red tail in contrast to Seyfert 1 galaxies although the statistics are limited. The line center energy, equivalent width, and profile are consistent with an origin in an ionized accretion disk. However the large mass accretion rate necessary to ionize the accretion disk is not consistent with the observed luminosity and normal accretion models.
Kunieda Hideyo
Misaki Kazutami
Mushotzky Richard F.
Ptak Andrew F.
Reichert Gail A.
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