SUMMARY OF PROPOSAL 41129
MR. HIDETOSHI KUBO
UNIVERSITY OF TOKYO
 JAPAN 113
TOKYO
7-3-1 HONGO BUNKYO-KU

  E-mail: KUBO@ASTRO.ISAS.AC.JP	Tel: 0427-51-3911(2612)	Fax: 0427-59-4253
  Medium: 2.5GB8MM

Subject: AGN                                                         
  Title: ORIGIN OF THE VERY HARD SPECTRUM OF THE HIGH REDSHIFT QUASAR Q0636+680(Z        


Abstract:
 We propose to observe the high redshift quasar Q0636+680(z=3.2). This quasar has the
 hardest xray spectrum among the high redshift quasars observed with ROSAT. This was
 interpreted as being possibly due to excess absorption. ROSAT could not constrain
 the absorber and the continuum form, but ASCA observation can do so significantly.
 It is important to understand the origin of the hard spectrum because it must impose
 constrains on the nature of the xray emission and the physical environment. It may
 also give clue to the AGN evolution and the cosmic xray background.

 Co-Is:
   1  TADAYUKI TAKAHASHI  	ISAS                          JAPAN     
      TAKAHASI@ASTRO.ISAS.AC.JP	0427-51-3911(2622)
   2  JYUN KATAOKA        	ISAS                          JAPAN     
   3  AKIKO YAMASHITA     	ISAS                          JAPAN     
   4  TUNEYOSHI KAMAE     	UNIV.OF TOKYO                 JAPAN     
   5  MAKOTO TASHIRO      	UNIV.OF TOKYO                 JAPAN     
   6  MASARU MATSUOKA     	RIKEN                         JAPAN     
   7  TAKAYA OHASHI       	TOKYO METRO. UNIV             JAPAN     
   8  NORIKO YAMAZAKI     	TOKYO METRO. UNIV             JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
Q0636+680              2  100.5179   67.9766    60   N   N   P  0.01000   1