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(189) #$L)" &T( . ®¯¬°0±. ῎῍ῑῌ. History and Problems of Broad Iron-Line Studies in AGNs Hitoshi NEGORO Department of Physics, CST, Nihon University, 1ῌ8 Kanda-Surugadai, Chiyoda-ku, Tokyo 101ῌ8308, Japan Abstract : Various relativistic e#ects around the black hole can be investigated through broad iron line profiles obtained from X-ray observations of AGNs. Andy Fabian in UK and his colleagues have shown that observed X-ray properties around the iron-line energy can be understood with such e#ects. The solution, however, is not unique. Here are presented history and remaining problems in the broad iron line interpretation.. ¼"½#. 2010 $ 6 ½.
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