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- Crab_(unit) abstract "A Crab is a standard astrophotometrical unit for measurement of the intensity of Astrophysical X-ray sources. One Crab is defined as the intensity of the Crab Nebula at the corresponding X-ray photon energy.The Crab Nebula, and the Crab Pulsar within it, is an intense space X-ray source. It is used as a standard candle in the calibration procedure of X-ray instruments in space. However, because of the Crab Nebula's variable intensity at different X-ray energies, conversion of the Crab to another units depends on the X-ray energy range of interest.In the photon energy range from 2 to 10 keV, 1 Crab equals 2.4 · 10−8 erg cm−2 s−1 = 15 keV cm−2 s−1 = 2.4 · 10−11 W m−2. For energies greater than ~30 keV, the Crab Nebula becomes unsuitable for calibration purposes, as its flux can no longer be characterized by a single coherent model.The unit mCrab, or milliCrab, is sometimes used instead of the Crab.".
- Crab_(unit) wikiPageID "30549271".
- Crab_(unit) wikiPageLength "2910".
- Crab_(unit) wikiPageOutDegree "23".
- Crab_(unit) wikiPageRevisionID "677887055".
- Crab_(unit) wikiPageWikiLink Astrophysical_X-ray_source.
- Crab_(unit) wikiPageWikiLink Calibration.
- Crab_(unit) wikiPageWikiLink Category:Crab_Nebula.
- Crab_(unit) wikiPageWikiLink Category:Nebulae.
- Crab_(unit) wikiPageWikiLink Category:Units_of_measurement_in_astronomy.
- Crab_(unit) wikiPageWikiLink Centimetre.
- Crab_(unit) wikiPageWikiLink Cosmic_distance_ladder.
- Crab_(unit) wikiPageWikiLink Crab_Nebula.
- Crab_(unit) wikiPageWikiLink Crab_Pulsar.
- Crab_(unit) wikiPageWikiLink Electronvolt.
- Crab_(unit) wikiPageWikiLink Energy.
- Crab_(unit) wikiPageWikiLink Erg.
- Crab_(unit) wikiPageWikiLink Flux.
- Crab_(unit) wikiPageWikiLink Intensity_(physics).
- Crab_(unit) wikiPageWikiLink Metre.
- Crab_(unit) wikiPageWikiLink Milli-.
- Crab_(unit) wikiPageWikiLink Photometry_(astronomy).
- Crab_(unit) wikiPageWikiLink Photon.
- Crab_(unit) wikiPageWikiLink Second.
- Crab_(unit) wikiPageWikiLink Space.
- Crab_(unit) wikiPageWikiLink Units_of_measurement.
- Crab_(unit) wikiPageWikiLink Watt.
- Crab_(unit) wikiPageWikiLink X-ray_astronomy_detector.
- Crab_(unit) wikiPageWikiLinkText "Crab (unit)".
- Crab_(unit) wikiPageWikiLinkText "Crab".
- Crab_(unit) wikiPageWikiLinkText "mCrab".
- Crab_(unit) wikiPageUsesTemplate Template:Reflist.
- Crab_(unit) subject Category:Crab_Nebula.
- Crab_(unit) subject Category:Nebulae.
- Crab_(unit) subject Category:Units_of_measurement_in_astronomy.
- Crab_(unit) hypernym Unit.
- Crab_(unit) type Organisation.
- Crab_(unit) type Object.
- Crab_(unit) type Plasma.
- Crab_(unit) type Unit.
- Crab_(unit) comment "A Crab is a standard astrophotometrical unit for measurement of the intensity of Astrophysical X-ray sources. One Crab is defined as the intensity of the Crab Nebula at the corresponding X-ray photon energy.The Crab Nebula, and the Crab Pulsar within it, is an intense space X-ray source. It is used as a standard candle in the calibration procedure of X-ray instruments in space.".
- Crab_(unit) label "Crab (unit)".
- Crab_(unit) sameAs Q5180211.
- Crab_(unit) sameAs Crab_(jednotka).
- Crab_(unit) sameAs Crabe_(unité).
- Crab_(unit) sameAs m.0g9wt1s.
- Crab_(unit) sameAs Поток_Крабовидной_туманности.
- Crab_(unit) sameAs Q5180211.
- Crab_(unit) wasDerivedFrom Crab_(unit)?oldid=677887055.
- Crab_(unit) isPrimaryTopicOf Crab_(unit).