SUMMARY OF PROPOSAL 52151
MD USA 20771
Tel: (301) 286-8099 Fax:
ASCA AND HST OBSERVATIONS OF BL LAC 0235+164 AND THE INTERVENING SYSTEM
ABSTRACTAO 0235+164 (z = 0.9) is a unique BL Lac object as it is located behind an intervening galaxy half way between us and the BL Lac, yet is is sufficiently bright in X--rays to provide a "white light source" to study the elemental composition in that galaxy. Our previous ROSAT and Asca observations of this highly variable source yielded excess absorption in the intervening system implying abundances of about 0.5 Solar, but the limited statistics precluded any measurement of edges due to individual elements. We propose to reobserve it for 20 ks simultaneously with STIS, to measure the elemental abundances as well as the dust content of the intervening system.
|TARGET NAME||PRI||RA||DEC||TIME||TC||OFF||GIS||SIS CNT||OBS|
|1)AO 0235+164|| 2|| 39.6583|| 16.6167|| 20 ks||N||Y||P||0.50000||1|
TARGET 1THIS OBSERVATION WILL BE CONDUCTED SIMULTANEOUSLY WITH STIS