Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5939u&link_type=abstract
HST Proposal ID #5939
Computer Science
Hst Proposal Id #5939 Agn
Scientific paper
Although high quality imaging of a few local BL Lac objects shows they are in giant elliptical galaxies, nothing is known about host galaxies at higher redshifts. Similarly, nearby BL Lac objects appear to be in rich clusters of galaxies but little is known about the evolution of these environments. Some nearby BL Lacs have close companions {r <2''}, possibly indicating that interactions are important the BL Lac phenomenon. There is disagreement about whether local z<0.3 and distant {z>0.5} BL Lac objects are the same thing or the latter are more closely related to quasars. The host galaxies and environments of local objects support the idea that BL Lacs are aligned versions of low-luminosity {FRI} radio galaxies, the so-called ``unified scheme,'' but as FRIs are only observed locally the extension of this scheme to higher redshift is unclear. We propose to study the host galaxies and environments of four radio-selected BL Lac objects from a well-defined, complete sample at high redshift {0.5 < z < 1}, to measure evolution in the isotropic properties of BL Lac objects and to determine whether the low- and high-redshift BL Lacs are similar or are distinct classes. No comparable HST data exist or are planned for any BL Lac objects.
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