SUMMARY OF PROPOSAL 42094
DR. JOEL N. BREGMAN
UNIVERSITY OF MICHIGAN
MI USA 48109-1090
ANN ARBOR
DENNISON BUILDING

  E-mail: JBREGMAN@ASTRO.LSA.UMICH.EDU	Tel: 313-764-3454	Fax: 313-763-6317
  Medium: 2GB8MM

Subject: SUPERNOVA REMNANTS AND GALACTIC DIFFUSE EMISSION            
  Title: SUPERNOVA REMNANTS: THE FIRST TWO DECADES                                       


Abstract:
 The soft X-ray emission seen shortly after a Type II supernova is the dominant
 radiative loss mechanism in SNR that are a few years old. The nature and evolution
 of this emission represents one of the major unexplored areas in the study of
 supernovae, but current telescopes make studies possible. To explain the emission,
 two theories have been proposed, a reverse shock model (with variations) and a cloud
 crushing model. Single X-ray spectra cannot distinguish between the two models, but
 the time evolution of the X-ray spectra should be a powerful diagnostic and here we
 propose to obtain the fundamental data that will constrain the models: high-quality
 X-ray spectra as a function of time for SN1986J, SN1978K (these will be second-epoch spectra), and SN 1993J.

 Co-Is:
   1  JOHN HOUCK          	UNIV. OF MICHIGAN             USA       
      (No Co-I contact data)
   2  ROGER CHEVALIER     	UNIV. OF VIRGINIA             USA       
   3  KOHJI TOMISAKA      	NIIGATA UNIVERSITY            JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
SN 1986J               0   35.6304   42.3326    70   N   Y   P  0.03400   1