Spectroscopy of BL Lac Objects -- Cycle 0

Details Spectroscopy of BL Lac Objects -- Cycle 0 Spectroscopy of BL Lac Objects -- Cycle 0

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.1172b&link_type=abstract

HST Proposal ID #1172

Physics

Hst Proposal Id #1172

Scientific paper

Two of the brightest X-ray emitting BL Lac objects, PKS 2155-304 and MK 421, 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. The lines to be probed include N V, C IV, Si IV, Mg II, Mg I, C I and H I. Based on the X-ray absorption, the absorption lines occurring in the putative jet are expected to be significantly broader than the absorption lines occurring in the halo.

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