SUMMARY OF PROPOSAL 42083
DR. PATRICK OLSON SLANE
SMITHSONIAN ASTROPHYSICAL OBSERVATORY
MA USA 02138
CAMBRIDGE
60 GARDEN STREET

  E-mail: SLANE@CFA.HARVARD.EDU	Tel: (617) 495-7256	Fax: (617) 495-7356
  Medium: 4GBDAT

Subject: SUPERNOVA REMNANTS AND GALACTIC DIFFUSE EMISSION            
  Title: A STUDY OF THE X-RAY SPECTRUM AND MORPHOLOGY OF CTA1                            


Abstract:
 ROSAT observations of CTA1 reveal a center-filled SNR whose morphology and spectrum
 suggests the presence of a central pulsar. The spectral characteristics appear
 consistent with a dominant synchrotron nebula in the central regions accompanied by
 a thermal perimeter which extends to the radio shell. We propose an ASCA observation
 consisting of two pointings, one centered on the bright central region and the other
 along the bright radio shell. The observations will confirm or refute the
 interpretation of a central plerion, provide a determination of the thermal
 characteristics of the blast wave region, and allow a comparison of the central
 engine energetics with the dynamical properties of the blast wave to provide a broad picture of the SNR development.

 Co-Is:
   1  DR. FREDERICK SEWARD	SAO                           USA       
      (No Co-I contact data)


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
CTA1_CENTER            0    2.0000   73.0667    40   N   N   P  0.20000   1 

REMARKS:  SEE PROPOSAL FOR CHIP SELECTION. CONTACT PI FOR DETAILED POINTING
          POSITION. BRIGHT 2-CCD MODE IS ACCEPTABLE DURING MEDIUM BIT RATE.