PKS 2155-304

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Image of PKS 2155-304 obtained in R band at ESO-NTT.

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.[1]


  1. ^ "An Exceptional VHE Gamma-Ray Flare of PKS 2155-304". The Astrophysical Journal. 664 (2): L71–L78. 2007. arXiv:0706.0797Freely accessible. doi:10.1086/520635.  |first1= missing |last1= in Authors list (help)