SUMMARY OF PROPOSAL 42160
DR. MARTIN ELVIS
SMITHSONIAN ASTROPHYSICAL OBSERVATORY
MA USA 02138
CAMBRIDGE
60 GARDEN ST

  E-mail: ELVIS@CFA.HARVARD.EDU	Tel: (617)495-7442	Fax: (617)495-7356
  Medium: 4GBDAT

Subject: COSMIC X-RAY BACKGROUND AND DEEP SURVEYS AND OTHER          
  Title: DAMPED LYMAN ALPHA ABSORBERS IN X-RAYS                                          


Abstract:
 We propose to observe two low z damped Lyman alpha absorption systems with ASCA,
 those toward 3C446 and PKS1451-375. Damped Lyman alpha systems are strong candidates
 for protogalaxies, and so the new constraints supplied by X-ray observations will be
 important for galaxy formation models. Absorption of the background quasar X-ray
 emission will measure their heavy element abundances, and limit their ionization state, and hence size.

 Co-Is:
   1  ANETA SIEMIGINOWSKA 	SAO                           USA       
      (No Co-I contact data)
   2  SMITA MATHUR        	SAO                           USA       
   3  FABRIZIO FIORE      	SAO                           USA       
   4  CHRIS CARILLI       	SAO                           USA       


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
3C446                  0  336.4467   -4.9502    40   N   N   P  0.28000   1