Our works
¡þ Astrophysics
1. Compact Objects

1.1 ¡¡Black Hole Binaries ¡ÁProblems against the standard model¡Á ¡Êdetails¡Ë
Black hole binaries are the system in which a black hole with a star mass and an ordinary star rotate around their center of gravity, forming a bynary system. The gas lost from surface of the star swirls around the black hole and gradually falls into it, emitting strong X-rays. The gas surrounding the black hole is called 'accretion disk'. We have established the existence of black holes by studying X-rays from these objects. Although the bahavior of the accretion disk has been described by a standard model (standard accretion disk). When accretion rate comes close to a limit (Eddington limit), however, another state of disk emerges (slim disk). ¡¡ ¼ÁÎ̹ßÃåΨ¤¬Ä㤤»þ¤Ïɸ½à¹ßÃå±ßÈפÎÉÁÁü¤¬À®¤êΩ¤Ä¤¬¡¢ ¹ßÃåΨ¤¬Eddington¸Â³¦¤Ë¶á¤Å¤¯¤È¤½¤ì¤¬Çˤ졢 ¥³¥ó¥×¥È¥ó»¶Íð¤Î¸ú¤¤¤¿±ßÈפ䡢¡Ö¥¹¥ê¥à±ßÈספ¬È¯¸½¤¹¤ë¤³¤È¤â¡¢ À¤³¦¤Ç½é¤á¤Æ´Ñ¬Ū¤Ë³Îǧ¤·¤¿ (±§Ã踦¤Ê¤É¤È¶¨ÎÏ)¡£ ¤Ç¤ÏEddington¸Â³¦¤òÂ礭¤¯±Û¤¨¤ë¹ßÃ夬µ¯¤­¤¿»þ¡¢ ʪ¼Á¤Ï¤¹¤Ù¤Æ¥Ö¥é¥Ã¥¯¥Û¡¼¥ë¤ËµÛ¤¤¹þ¤Þ¤ì¤ë¤Î¤«¡¢ ¤½¤ì¤È¤â¥¢¥¦¥È¥Õ¥í¡¼¤Ë¤Ê¤ë¤Î¤«¡© 2005ǯ¤ËÂǤÁ¾å¤²Í½Äê¤Î ASTRO-E2±ÒÀ±¤¬¡¢¤½¤ÎÅú¤¨¤òÍ¿¤¨¤Æ¤¯¤ì¤è¤¦¡£

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