SCATTERED X-RAYS IN OBSCURED ACTIVE GALACTIC NUCLEI AND THEIR IMPLICATIONS FOR GEOMETRICAL STRUCTURE AND EVOLUTION
SCATTERED X-RAYS IN OBSCURED ACTIVE GALACTIC NUCLEI AND THEIR IMPLICATIONS FOR GEOMETRICAL STRUCTURE AND EVOLUTION
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DOI：
10.1088/0004-637x/711/1/144
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发表时间：
2010-02
期刊：
影响因子：
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通讯作者：
K. Noguchi;Y. Terashima;Y. Ishino;Y. Hashimoto;M. Koss;Y. Ueda;H. Awaki
中科院分区：
文献类型：
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作者：
K. Noguchi;Y. Terashima;Y. Ishino;Y. Hashimoto;M. Koss;Y. Ueda;H. Awaki
We construct a new sample of 32 obscured active galactic nuclei (AGNs) selected from the Second XMM-Newton Serendipitous Source Catalogue to investigate their multiwavelength properties in relation to the “scattering fraction,” the ratio of the soft X-ray flux to the absorption-corrected direct emission. The sample covers a broad range of the scattering fraction (∼0.1%–10%). A quarter of the 32 AGNs have a very low scattering fraction (⩽ 0.5%), which suggests that they are buried in a geometrically thick torus with a very small opening angle. We investigate correlations between the scattering fraction and multiwavelength properties. We find that AGNs with a small scattering fraction tend to have low [O iii]λ5007/X-ray luminosity ratios. This result agrees with the expectation that the extent of the narrow-line region is small because of the small opening angle of the torus. There is no significant correlation between scattering fraction and far-infrared luminosity. This implies that a scale height of the torus is not primarily determined by starburst activity. We also compare scattering fraction with black hole mass or Eddington ratio and find a weak anti-correlation between the Eddington ratio and scattering fraction. This implies that more rapidly growing supermassive black holes tend to have thicker tori.
