The environment of the BL Lacertae object PKS 2155-304

Details The environment of the BL Lacertae object PKS 2155-304 The environment of the BL Lacertae object PKS 2155-304

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411l..63f&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 411, no. 2, p. L63-L66.

Astronomy and Astrophysics

Astrophysics

55

Active Galactic Nuclei, Astronomical Spectroscopy, Bl Lacertae Objects, Galactic Clusters, Density Distribution, Spectrum Analysis

Scientific paper

We report on direct imaging and spectroscopy of the field around the BL Lac object PKS 2155-304. An analysis of the richness of galaxies in the field shows that the source is located in a poor cluster of galaxies. Spectra of three galaxies indicate that they are at redshift z about 0.116, and the spectrum of the nebulosity surrounding the BL Lac object, yielding z = 0.116, shows that the BL Lac object belongs to the cluster. The galaxy environment of BL Lac objects, together with those of F-R I radio sources, the proposed parent objects in the beaming hypothesis, is briefly discussed.

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