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BL Lacertae Objects
A BL Lacertae object or BL Lac object is a type of active galactic nucleus (AGN) or a galaxy with such an AGN, named after its prototype, BL Lacertae. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and large-amplitude flux variability and significant optical polarization. Because of these properties, the prototype of the class (BL Lac) was originally thought to be a variable star. When compared to the more luminous active nuclei (quasars) with strong emission lines, BL Lac objects have spectra dominated by a relatively featureless non-thermal emission continuum over the entire electromagnetic range. This lack of spectral lines historically hindered identification of the nature and distance of such objects. In the unified scheme of radio-loud active galactic nuclei, the observed nuclear phenomenology of BL Lacs is interpreted as being due to the effects of the relativistic jet closely aligned to the line of sight of the observer. BL Lacs a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BL Lacertae Pan-STARRS DR1
BL (or similar) may refer to: Arts and entertainment * Boys' love, a Japanese term for fiction featuring romantic relationships between male characters * BL Publishing, a division of the wargames manufacturing company, Games Workshop * ''Boston Legal'', a US legal comedy-drama Businesses and organizations * Balmer Lawrie, an Indian central public sector undertaking conglomerate * Bell Labs, an audio-technology research and design enterprise * Boys' Latin School of Maryland, a US private school * Brisbane Lions, an Australian rules football team in the Australian Football League * British Library, the UK's national library * British Leyland, a former UK vehicle manufacturing company * Pacific Airlines (IATA code BL), a low-cost airline * Lytvyn Bloc, a Ukrainian political party Food and drink * Bitter lemon, a carbonated soft drink * Bud Light, an American lager beer Law * Bachelor of Laws (B.L.), an undergraduate degree in law * Barrister-at-Law, a degree and professional qual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |