Detailed Hard X-Ray Measurements of Nuclear Emission from the Seyfert2 Galaxy NGC4388 with Suzaku

Details Detailed Hard X-Ray Measurements of Nuclear Emission from the Seyfert2 Galaxy NGC4388 with Suzaku Detailed Hard X-Ray Measurements of Nuclear Emission from the Seyfert2 Galaxy NGC4388 with Suzaku

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60s.263s&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.60, No.SP1, pp.S263--S276

Astronomy and Astrophysics

Astronomy

7

Galaxies: Active, Galaxies: Individual (Ngc4388), Galaxies: Seyfert, X-Rays: Galaxies

Scientific paper

We report on a Suzaku observation of the nearby Seyfert2 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 10keV. The center energy and the Kβ/Kα ratio of the narrow Fe-K line, together with less time variability, indicate that the fluorescent material is far from the black hole. A spectral hump around the 30-40keV 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-Kα absorption line was also detected, indicating the existence of highly ionized plasma.

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