Imaging of BL Lac Host Galaxies and Environments

Details Imaging of BL Lac Host Galaxies and Environments Imaging of BL Lac Host Galaxies and Environments

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3648i&link_type=abstract

HST Proposal ID #3648

Mathematics

Logic

Hst Proposal Id #3648

Scientific paper

We propose to take deep Planetary Camera images of 4 BL Lac objects in the I(795LP) filter. Image deconvolution techniques will be used to a) measure luminosities and basic morphological information for the nebulosity, b) determine the degree of centering of the AGN on the nebulosity, and c) study the cluster environment of the AGN. The BL Lac objects are selected from complete X-ray and radio-selected samples and lie in the redshift range 0.34 < z < 0.55. We will derive structural information unobtainable from the ground, and will be able to measure evolutionary effects by comparison with ground-based data obtained for objects at lower redshift. There is good evidence that the continuum properties of BL Lac objects are affected by two quite distinct physical mechanisms: relativistic beaming and gravitational lensing. If beaming models are generally applicable, the data will yield a test of the parent population of BL Lacs (the misdirected jets) via the distribution of host galaxy luminosities and morphologies. If (micro)lensing is common, it will manifest itself as off-centered nebulosity around the AGN, and an inferred host galaxy that is too luminous to be at the redshift of the BL Lac object. Either way, we will be able to detect cosmic evolution in the environment, or differences between X-ray and radio- selected BL Lacs.

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