Wide-Band Spectroscopy of the Compton Thick Seyfert2 Galaxy Markarian 3 with Suzaku

Abstract

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$\times$10$^{24}$cm$^{-2}$, has an intrinsic 2-10keV luminosity of $\sim$1.6$\times$10$^{43}$ergs$^{-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$\pm$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 ($\sigma$$<$ 22eV). The weak, soft power-law emission is considered to be scattered light by ionized gas with a scattering fraction of 0.9$\pm$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 ergcms$^{-1}$. This high-quality spectrum obtained by Suzaku can be considered to be a template for studies of Seyfert2 galaxies.