The STACEE detector in New Mexico observes Cherenkov radiation from one of these objects, specifically Markarian 421.
The STACEE detector in New Mexico observes Cherenkov radiation from one of these objects, specifically Markarian 421. The EGRET catalog, which documents gamma ray sources, lists (*) 66 of them in total, and several other possible candidates will be observed by the GLAST mission. Their relativistic jets often omit radiation that is blue-shifted. They belong to the radio-loud group of active galactic nuclei, and are powered by energy being pulled into a supermassive black hole. FTP name these objects which can be divided into optically violent variables and BL Lac objects, which can also be quasars and thus have a similar-sounding name.
The STACEE detector in New Mexico observes Cherenkov radiation from one of these objects, specifically Markarian 421.
blazars (prompt on "quasars" before the asterisk)