Host galaxy and environment of the BL Lacertae object PKS 0548-322: Observations with subarcsecond resolution

Details Host galaxy and environment of the BL Lacertae object PKS 0548-322: Observations with subarcsecond resolution Host galaxy and environment of the BL Lacertae object PKS 0548-322: Observations with subarcsecond resolution

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438l...9f&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 438, no. 1, p. L9-L12

Astronomy and Astrophysics

Astrophysics

33

Bl Lacertae Objects, Brightness Distribution, Galactic Clusters, Galactic Evolution, High Resolution, Interacting Galaxies, Astronomical Photometry, Astronomical Spectroscopy, Galactic Bulge, Imaging Techniques, Red Shift

Scientific paper

We report on direct, subarcsecond resolution imaging of the nebulosity and spectroscopy of galaxies in the field of the BL Lacertae object PKS 0548-322. Surface photometry of the nebulosity is used to derive the properties of the host galaxy (MV = -23.4), which exhibits signs of interaction with a close companion galaxy at approximately 25 kpc. The radial brightness profile of the nebulosity is well fitted by the contribution of a bulge (r1/4) plus a point source and a small internal disk. An analysis of the galaxies in the field shows that the source is located in a rich cluster of galaxies. Spectra of five galaxies in the field indicate that they are at the same redshift as the BL Lac object, thus supporting the imaging result of a surrounding cluster associated with the BL Lac. This cluster is most likely Abell S0549.

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