Wide-Band Spectroscopy of the Compton Thick Seyfert2 Galaxy Markarian 3 with Suzaku
Isobe, Naoki; Kunieda, Hideyo; Okajima, Takashi; Yaqoob, Tahir; Fukazawa, Yasushi; Makishima, Kazuo; Takahashi, Tadayuki; Awaki, Hisamitsu; Terashima, Yuichi; Gallo, Luigi C.; Reeves, James N.; Anabuki, Naohisa; Itoh, Takeshi; Miniutti, Giovanni; Mizuno, Tsunefumi; Markowitz, Alex; Ptak, Andrew; Ikeda, Shinya
Japan, United Kingdom, United States
Abstract
We obtained a wide-band spectrum of the Compton-thick Seyfert2 galaxy Mkn3 with Suzaku. The observed spectrum was clearly resolved into weak, soft power-law emission, a heavily absorbed power-law component, cold reflection, and many emission lines. The heavily absorbed component, absorbed by gas with a column density of 1.1 × 1024 cm-2, has an intrinsic 2-10keV luminosity of ∼1.6×1043 ergs-1, and is considered to be direct emission from the Mkn3 nucleus. The reflection component was interpreted as being the reflection of direct light off a cold, thick material; the reflection fraction, R, was 1.36±0.20. The cold material is inferred to be located > 1 pc from the central black hole of Mkn3, due to the low ionization parameter of iron (xi < 1ergcms-1) and the narrow iron line width (σ < 22eV). The weak, soft power-law emission is considered to be scattered light by ionized gas with a scattering fraction of 0.9±0.2%. The existence of many highly ionized lines in the observed spectrum indicates that the ionized gas has a broad ionized structure, with xi = 10--1000 erg cm s-1. This high-quality spectrum obtained by Suzaku can be considered to be a template for studies of Seyfert2 galaxies.