PKS 2155-304 is a BL Lac object, a galaxy hosting a type of blazar. It is a strong emitter from radio to high-energy frequencies.
PKS 2155-304 is at redshift z = 0.116 (Falomo, Pesce & Treves 1993)[full citation needed]. It is one of the brightest and most studied BL Lacs, one of the first identified through X-ray observations.[1]
References
- ^ Aharonian, F.; et al. (2007). "An Exceptional Very High Energy Gamma-Ray Flare of PKS 2155-304". The Astrophysical Journal. 664 (2): L71 – L78. arXiv:0706.0797. Bibcode:2007ApJ...664L..71A. doi:10.1086/520635. S2CID 119319369.
