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publication
ASCA Observation of the Low-Luminosity Seyfert 1.5 Galaxy NGC 5033

Y. Terashima, H. Kunieda, and K. Misaki
Abstract

We present the results of an ASCA observation of the low-luminosity Seyfert 1.5 galaxy NGC 5033. A point-like X-ray source with a luminosity of 2.3x1041 erg s-1 in the 2-10 keV band (at 18.7 Mpc; Tully 1988, AAA 045.002.054) was detected at the nucleus. The X-ray light curve shows variability on a timescale of ~ 104 s with an amplitude of ~ 20%. The X-ray continuum is represented by a weakly absorbed (NH ~9x1020 cm-2) power-law with a photon index of 1.72+/-0.04, which is quite similar to Seyfert 1 galaxies with higher luminosities. An Fe Kƒ¿ emission line is detected at 6.40+0.08-0.06 keV (redshift corrected) and the equivalent width is 290+/-100 eV. The line width is unresolved. The narrower line width and larger equivalent width compared to Seyfert 1s imply that fluorescent Fe Kƒ¿ emission from matter further out from the center than the accretion disk significantly contributes to the observed Fe Kƒ¿ line. We suggest that fluorescent Fe Kƒ¿ emission from the putative torus contributes to the observed Fe Kƒ¿ line.

 
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