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In 2006 June, the obscured low luminosity active galactic nucleus in thenearby Seyfert 1.9 galaxy NGC 4258 was observed with Suzaku for ~ 100 ks.Utilizing the XIS and the HXD, the nucleus emission was detected over 2 to 40keV range, with an unabsorbed 2--10 keV luminosity of 8 x 10 40 erg / s, andvaried by a factor of ~ 2 during the observation. Its 2--40 keV spectrum isreproduced by a single power law with photon index of ~ 2.0, absorbed by anequivalent hydrogen column of ~ 1.0 x 10 23 cm2. The spectrum within 4' of thenucleus required also a softer thin-thermal emission, as well as anintermediate hardness component attributable to integrated point sources. Aweak neutral Fe-Kalpha florescence line was detected at an equivalent width of~ 40 eV. The cold reflection component was not required by the data, with thereflector solid angle Omega seen from the nucleus constrained as Omega / 2 pi <0.3 assuming a general case of 60 deg inclination. The results suggest that thecold reflecting material around the nucleus is localized along our line ofsight, rather than forming a thick torus.

Suzaku Results on the Obscured Low-Luminosity Active Galactic Nucleus in NGC 4258