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.
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PKS 0521-365 — PKS 2155 304 is one of the brightest active galaxies in the sky. The source (BL Lac) is a strong emitter from radio to gamma frequencies. The object is at z = 0.116 … Wikipedia
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BL Lac object — A BL Lacertae object or BL Lac object is a type of active galaxy with an active galactic nucleus (AGN) and is named after its prototype, BL Lacertae. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and… … Wikipedia
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Modern searches for Lorentz violation — Important motivations for modern searches for Lorentz violation are deviations from Lorentz invariance (and thus special relativity) predicted by some variations of quantum gravity, string theory, and some alternatives to general relativity.… … Wikipedia
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