Spectroscopy of BL Lac Objects Cycle 2

Details Spectroscopy of BL Lac Objects Cycle 2 Spectroscopy of BL Lac Objects Cycle 2

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3965b&link_type=abstract

HST Proposal ID #3965

Physics

Hst Proposal Id #3965

Scientific paper

One of the brightest X-ray emitting BL Lac objects, PKS 2155-304,will be observed for dual scientific purposes. The first objective is to look for the possible shortward shifted absorption in strong UV lines (e.g. C IV, Si IV and N V) to follow up on the report of shortward-shifted absorption in the X-ray by Canizares and Kruper (Ap.J., 278, l99 - 1984). A detection of such absorption would provide additional support to the relativistic jet model, in which a gas jet from BL Lac nucleus is moving toward us. The second objective is to probe the galactic halo gas using those bright BL Lac objects as continuum background source. A search will also be made for absorption arising in the the intergalactic medium and halos of intervening galaxies.

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