SUMMARY OF PROPOSAL 42115
DR IAN MICHAEL GEORGE
GODDARD SPACE FLIGHT CENTER
MD USA 20771
GREENBELT
GREENBELT ROAD

  E-mail: LHEAVX::GEORGE	Tel: 301-286-6094	Fax: 301-286-1684
  Medium: 4GBDAT

Subject: AGN                                                         
  Title: THE LOCATION OF THE WARM ABSORBER IN NGC 3783                                   


Abstract:
 We propose 4x40 ksec observations of NGC 3783 to determine the location of, and
 constrain the physical conditions within the strong ``warm absorber'' surrounding
 this source. This object is ideal for such a study since it has exhibited a clear
 correlation of ionization parameter with continuum flux level, and there is an OVII
 emission line at 0.57 keV in the AO1 spectrum with an intensity consistent with
 plausible physical models. The proposed observations will allow us to place
 stringent constraints on the correlations between the X-ray continuum and both the
 ionized absorber and emitter. Thus we be able to determine the location of the warm
 absorber along with the density, ionization state and volume of the ionized gas.

 Co-Is:
   1  JANE TURNER         	NASA/GSFC/USRA                USA       
      LHEAVX::TURNER	301-286-5190
   2  HAGAI NETZER        	TEL AVIV UNIVERSITY           ISRAEL    
   3  DANIEL M CRENSHAW   	NASA/GSFC                     USA       
   4  RICHARD MUSHOTZKY   	NASA/GSFC                     USA       


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
NGC 3783               0  174.7542  -37.7383    80   Y   Y   P  1.50000   4 

REMARKS:  SHOULD BE SIMULTANEOUS WITH XTE (ASSUMING LAUNCH PRIOR TO 1996 SUMMER) AND
          HST (ASSUMING TIME AWARDED)
Co-Ordinated Ob:
                Start: Jun 1, 1996 at 00 UT
                 Stop: Aug 6, 1996 at 00 UT
Monitored Oservation:
          Min. Int: 70.000  Max. Int: 140.000