HST Observations of Host Galaxies in Three Radio-selected BL Lacertae Objects

Details HST Observations of Host Galaxies in Three Radio-selected BL Lacertae Objects HST Observations of Host Galaxies in Three Radio-selected BL Lacertae Objects

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...476..113f&link_type=abstract

Astrophysical Journal v.476, p.113

Astronomy and Astrophysics

Astronomy

33

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Bl Lacertae Objects: Individual Alphanumeric: 0814+425, Galaxies: Bl Lacertae Objects: Individual Alphanumeric: 1823+568, Galaxies: Bl Lacertae Objects: Individual Alphanumeric: 2254+074, Galaxies: Structure

Scientific paper

We present high-resolution images of three BL Lac objects (0814+425, 1823+568, 2254+074) taken with the WFPC-2 camera on Hubble Space Telescope (HST) as part of a study of BL Lacs from a complete radio-selected sample. In two cases we clearly detect the host galaxies while the third BL Lac (0814+425) is unresolved. The host galaxy of 2254+074 is a moderately bright elliptical, while the inferred luminosity of the host galaxy for 1823+568 is at the high end of the range for previously known BL Lac hosts. The lack of detection of a host galaxy for 0814+425 calls into question the validity of its low reported redshift. Comparison of the HST data with subarcsecond ground-based R-band images shows excellent agreement on the largest scales, while on smaller scales only HST detects the galaxy significantly above the nuclear light. In the case of 2254+074, the high resolution of HST allows us to establish that the host galaxy is an elliptical.

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