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Home > Art, Film & Photography > Bl Lac Objects: Oj 287, Bl Lacertae, Bl Lac Object, Markarian 421, Pks 0521-365, Pks 2155-304
Bl Lac Objects: Oj 287, Bl Lacertae, Bl Lac Object, Markarian 421, Pks 0521-365, Pks 2155-304

Bl Lac Objects: Oj 287, Bl Lacertae, Bl Lac Object, Markarian 421, Pks 0521-365, Pks 2155-304


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About the Book

Chapters: Oj 287, Bl Lacertae, Bl Lac Object, Markarian 421, Pks 0521-365, Pks 2155-304. Source: Wikipedia. Pages: 22. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: OJ 287 is a BL Lac object that has produced quasi-periodic optical outbursts going back approximately 100 years, as first apparent on photographic plates from 1891. It was first detected at radio wavelengths during the course of the Ohio Sky Survey. Its central supermassive black hole is claimed to be the largest known, with a mass of 18 billion solar masses, more than six times the value calculated for the previous largest object. The optical light curve shows that OJ 287 has a periodic variation of 11-12 years with a narrow double peak at maximum brightness. This kind of variation suggests that an engine is a binary supermassive black hole where a smaller black hole with a mass of only 100 million MSun orbits the larger one with an observed 11-12 year orbital period. The maximum brightness is obtained when the minor component moves through the accretion disk of the supermassive component at perinigricon. The mass was calculated by a team led by Mauri Valtonen of Tuorla Observatory in Finland, and the group's results were presented to the public at the 211th meeting of the American Astronomical Society (AAS). The timing of these outbursts allows the precession of the companion's elliptical orbit to be measured (39 per orbit), which allows the mass of the central black hole to be calculated using Albert Einstein's principles of General relativity (see Kepler problem in general relativity). The accuracy of this measurement has been called into question due to the limited number and precision of observed companion orbits, but the calculated value will be further refined using future measurements. The companion's orbit is deca...More: http: //booksllc.net/?id=5024642


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Product Details
  • ISBN-13: 9781158653997
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Oj 287, Bl Lacertae, Bl Lac Object, Markarian 421, Pks 0521-365, Pks 2155-304
  • Width: 229 mm
  • ISBN-10: 1158653999
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 1 mm
  • Weight: 50 gr


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