SUMMARY OF PROPOSAL 41174
DR. CHIKO OTANI
THE INSTITUTE OF THE PHYSICAL AND CHEMICAL RESEARCH (RIKEN)
SAITAMA JAPAN 351-01
WAKO
2-1 HIROSAWA

  E-mail: OTANI@POSTMAN.RIKEN.GO.JP	Tel: 048-462-1111(EX.3227)	Fax: 048-462-4640
  Medium: 4GBDAT

Subject: AGN                                                         
  Title: SEARCH FOR THE TRANSITION FROM THE WARM ABSORBER TO THE COLD ABSORBER IN QUASAR MR 2251-178


Abstract:
 We propose 4 pointing observations of a nearby radio-quiet quasar MR2251-178 in
 order to search for the transition from the warm absorber to the cold absorber along
 with the decrease of the X-ray continuum intensity. These observations will clarify
 the behavior of the warm absorber and the relation between the warm absorber and the
 BLR clouds. These observations have also the potential to determine the iron line
 structure from the relativistic accretion disk in a quasar.

 Co-Is:
   1  TSUNEO KII          	ISAS                          JAPAN     
      KII@ASTRO.ISAS.AC.JP	0427-51-3911
   2  KAYOKO MIYA         	ISAS                          JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
MR 2251-178            2  343.5242  -17.5819    80   Y   Y   P  1.00000   4 

REMARKS:  EACH EXPOSURE SHOULD BE 20 KSEC.\\ EACH INTERVAL BETWEEN NEIGHBORING TWO
          OBSERVATIONS\\ SHOULD BE LONGER THAN 20 DAYS IN ORDER TO CATCH\\ THE EPOCH
          OF THE DIFFERENT CONTINUUM INTENSITIES.
Monitored Oservation:
          Min. Int: 1700.000  Max. Int: 30000.000