SUMMARY OF PROPOSAL 42109
DR. RICHARD MUSHOTZKY
NASA/GSFC
MD USA 20771
GREENBELT
CODE 666

  E-mail: MUSHOTZKY@LHEAVX.GSFC.NASA.GOV	Tel: 301-286-7579	Fax: 301-286-1684
  Medium: 2GBDAT

Subject: AGN                                                         
  Title: ASCA OBSERVATIONS OF HST UNDETECTED LINERS                                      


Abstract:
 Recent HST observations show that only ~20% of LINERs have a point-like nuclear UV
 continuum source indicative of a AGN as the origin of the line excitation source in
 these objects. The remaining 80% may be highly obscured UV sources, extended
 starburst regions or "fossil" nebulae. We propose to observe with ASCA 3 of the
 "undetected" LINERs whose H(a) flux is similar to that of the detected objects to
 determine whether they have a hard x-ray spectrum indicative of the presence of an
 AGN. ASCA has already shown (e.g. M106) that it is capable of detecting AGN with
 high column densities which make them essentially invisible in the UV, optical or
 soft x-ray bands. This unique way of probing beyond the suggested obscuring material will help reveal the true nature of LINERs.

 Co-Is:
   1  PETER SERLEMITSOS   	NASA/GSFC                     USA       
      SERLEMITSOS@LHEAVX.GSFC.NASA.GOV	301-286-5255
   2  ANDREW PTAK         	NASA/GSFC/UMCP                USA       
   3  HAGAI NETZER        	TEL AVIV UNIVERSITY           ISRAEL    
   4  DAN MAOZ            	TEL AVIV UNIVERSITY           ISRAEL    


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
NGC 4438               0  186.9417   13.0089    40   N   Y   P  0.94000   2