JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
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titleProbe of material around the AGN central engine with Suzaku
Author(jpn)深沢, 泰司
Author(eng)Fukazawa, Yasushi
Author Affiliation(jpn)広島大学理学部物理学科
Author Affiliation(eng)Department of Physical Sciences, Hiroshima University
Issue Date2010-02-26
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構特別資料:
JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H
Start page236
End page239
Publication date2010-02-26
AbstractMaterial around the AGN central engine is important to understand the evolution of supermassive black hole. We systematically analyzed the Suzakud data of about 70 Seyfert galaxies, about half of which are Compton-thick AGNs, focusing on Fe-K emission/absorption lines, edge, and reflection component. Thanks to well-calibrated data, the center energy and width of the 6.4 keV line is strongly constrained to be 6.395 +/- 0.005 keV and app < 2500 km/s. Fe abundance of the reflector or absorber is also well constrained to be 0.5-1.2 solar, especially for Seyfert 2 galaxies. These support that the reflector is > 0.1 pc away from the nucleus. HXD-PIN enables us to determine the absorption and the direct nuclear X-ray luminosity unambiguously. We obtained a clear relation between the absorption column density and the equivalent width of 6.4 keV line, suggesting that the picture of Compton-thick torus is as a whole accepted for both Seyfert 1 and 2 galaxies. Thanks to high quality data with signal-to-noise ratio and accurate continuum determination of Suzaku, ionized Fe-Kalpha emission or absorption lines are detected from several percents of AGNs. It is found that these features seem to change above several 10(exp 44) erg/s in such a way that Fe-K features become weak. This extends the previously known X-ray Baldwin effect on the neutral Fe-Kalpha line to ionized emission or absorption lines. Luminosity-dependence of these properties, regardless of scatter of black hole mass by two orders of magnitudes, indicates that the ionized material is associated with the parent galaxy rather than the outflow and high luminosity nuclear emission would fully ionize the material. This picture matches a trend of lower cold absorption columns for high luminosity AGNs.
DescriptionMeeting Information: The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
KeywordsGalaxies: Seyfert - X-ray: Spectroscopy - X-rays: Iron line
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-09-008E

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