Mathematics – Logic
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5992j&link_type=abstract
HST Proposal ID #5992
Mathematics
Logic
Hst Proposal Id #5992 Agn
Scientific paper
We proposed to obtain short {unsaturated} and deep PC images of 16 BL Lac objects selected from complete X-ray and radio- selected samples. We were given enough time to observe 4 objects. These high spatial resolution images will allow measurement of the luminosities of the host galaxies and provide basic morphological information about the hosts. They will allow the study of the inner regions {<4 Kpc} of BL Lacs in unprecedented detail and the determination of the degree of centering of the AGN with respect to the host. The longer exposures will allow the study of faint companion galaxies or other signs of interactions between the AGN and companions. All of this information is valuable for testing the current paradigms for the mechanism{s} responsible for the observed properties of BL Lacs and for identifying the parent population of these objects. The continuum properties might be affected by two distinct physical mechanisms: relativistic beaming and gravitational lensing. If beaming models are applicable, the data will yield a diagnostic for the parent population via the distribution of host galaxy luminosities and morphologies. In addition we will be able to test, again by comparison of the host galaxy properties, whether X-ray {less variable, greater fraction of their integrated light from stars} and radio-selected BL Lacs are drawn from the same population. If {micro}lensing is common, it will manifest itself as off-centered nebulosity around the AGN.
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