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Similar Markarian 501, Markarian 421, BL Lacertae, 3C 279, 3C 66A | ||
A qpo in the optical polarization of pks 2155 304 by n pekeur
PKS 2155-304 is one of the brightest active galaxies in the sky.
It is a strong emitter from radio to high energy frequencies. PKS 2155-305 is at redshift z = 0.116 (Falomo, Pesce & Treves 1993) and it is one of the brightest and most studied BL Lacs and is often considered the prototype of X-ray selected BL Lacs.
References
PKS 2155-304 Wikipedia(Text) CC BY-SA