Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7893u&link_type=abstract
HST Proposal ID #7893
Physics
Hst Proposal Id #7893 Agn And Quasars
Scientific paper
The two types of BL Lac objects offer a unique opportunity to explore the physical link between jet formation and galaxy- scale processes in AGN. BL Lacs are dominated by an aligned relativistic jet, and the frequency of its synchrotron peak defines their type as either ``Low-frequency peaked BL Lacs'' {LBL} or ``High-frequency peaked BL Lacs'' {HBL}. The systematically different peak frequencies imply markedly different magnetic fields and particle energies -- i.e., different jet physics. There are reasons to expect differences in large-scale properties as well, based on estimated space densities and cosmic evolution. If so, the host galaxies should be systematically different, which would establish a direct connection between energy balance within the jet and processes on scales 10 million times larger. NICMOS is the most sensitive probe of AGN host galaxies, even for the reddest BL Lacs in our sample. We therefore propose a NIC2 F160W snapshot survey of two carefully selected LBL and HBL samples, well matched in redshift and intrinsic AGN power. This builds on our WFPC2 survey of a well-defined sample of 97 BL Lac objects, for which host galaxies were detected in 90 simulations predict 100 provide essential constraints on galaxy properties -- luminosity, size, morphology, and color -- including an unprecedented ensemble of host galaxy color profiles at subarcsecond spatial resolution.
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