NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T23:51:06 PDT
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For refcode 2008PASJ...60S.263S:
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NED Abstract

Copyright by Astronomical Society of Japan. 2008PASJ...60S.263S Detailed Hard X-Ray Measurements of Nuclear Emission from the Seyfert2 Galaxy NGC4388 with Suzaku Shirai, H.; Fukazawa, Y.; Sasada, M.; Ohno, M.; Yonetoku, D.; Yokota, S.; Fujimoto, R.; Murakami, T.; Terashima, Y.; Awaki, H.; Ikeda, S.; Ozawa, M.; Tsuru, T. G. Abstract. We report on a Suzaku observation of the nearby Seyfert 2 galaxy NGC4388. The overall spectrum is well described by the combination of strongly absorbed power-law plus thin thermal plasma emission, as well as previous observations. Thanks to well-calibrated instruments and a low background level, Suzaku measured the broad-band X-ray spectra more precisely than ever, and enabled us to probe the physical structure of the nuclear region. In addition, a time variability having a factor of 1.5 with a half-day time scale was found up to above 10 keV. The center energy and the K{beta}/K{alpha} ratio of the narrow Fe-K line, together with less time variability, indicate that the fluorescentmaterial is far from the black hole. A spectral hump around the 30-40 keV band, together with a Compton shoulder of the Fe-K line, requires a significant contribution of the reflection component. This is also consistent with a smaller amplitude of time variability in a higher energy band. A large contribution of the reflection component was not observed by the CGRO/OSSE and BeppoSAX, suggesting that NGC4388 had been in a higher flux state, and that Suzaku observed its light echo. A He-like Fe-K{alpha} absorption line was also detected, indicating the existence of highly ionized plasma. Key words: galaxies: active-galaxies: individual (NGC4388)- galaxies: Seyfert - X-rays: galaxies
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