SUMMARY OF PROPOSAL 42102
DR. CRAIG L. SARAZIN
UNIVERSITY OF VIRGINIA
VIRGINIA USA 22903-0818
CHARLOTTESVILLE
P.O. BOX 3818

  E-mail: CLS7I@VIRGINIA.EDU	Tel: 804-924-4903	Fax: 804-924-3104
  Medium: 5GB8MM

Subject: NORMAL GALAXIES                                             
  Title: X-RAY SPECTRA OF ELLIPTICAL GALAXIES: GAS DYNAMICS, CHEMICAL EVOLUTION, AND MISSING MASS


Abstract:
 We propose ASCA observations of three bright early-type galaxies: NGC1395, NGC1553,
 and NGC4756. The relative contributions of hot gas and X-ray binaries to the
 emission will be determined from the overall spectral shape. The fluxes of iron
 lines give a direct measure of the Type Ia SN rate, while lines from lighter
 elements will be used to study the chemical evolution and dynamics of the gas.
 NGC1395 and NGC1553 have very deep ROSAT PSPC and HRI images, which will be combined
 with our ASCA pointings to determine surface brightness distributions, temperatures,
 heavy element abundances, and virial masses. The surface brightnesses, temperatures,
 and abundances will tell us whether the gas in ellipticals is in steady-state or is expanding (subsonically or in a wind).

 Co-Is:
   1  CAROLINE COX        	UNIV. OF VIRGINIA             USA       
      (No Co-I contact data)
   2  JIMMY IRWIN         	UNIV. OF VIRGINIA             USA       
   3  JEFFREY BREEN       	UNIV. OF VIRGINIA             USA       


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
NGC1395                0   54.6275  -23.0250    40   N   N   P  0.05300   1