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- Cygnus_X-1 abstract "Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source and black hole candidate in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 2.3×10−23 W m−2 Hz−1 (2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole candidate and it remains among the most studied astronomical objects in its class. It is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too compact to be any known kind of normal star or other likely object besides a black hole. If so, the radius of its event horizon is about 44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 6,070 light-years from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1974, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.".
- Cygnus_X-1 thumbnail Cygnus_IAU.svg?width=300.
- Cygnus_X-1 wikiPageExternalLink Chakrabarti%20and%20Titarchuk.
- Cygnus_X-1 wikiPageExternalLink ap090608.html.
- Cygnus_X-1 wikiPageExternalLink 1995ApJ...455..623C.
- Cygnus_X-1 wikiPageExternalLink 2006ApJ...642L..49C.
- Cygnus_X-1 wikiPageExternalLink index.cfm?fobjectid=32709.
- Cygnus_X-1 wikiPageExternalLink austria_cygnus_1.
- Cygnus_X-1 wikiPageExternalLink cygx1.html.
- Cygnus_X-1 wikiPageExternalLink goto.aspx?object=ViewShortcut&ra=19.9726944444444&dec=35.2016111111111&zoom=8.3819031715393.
- Cygnus_X-1 wikiPageID "86061".
- Cygnus_X-1 wikiPageRevisionID "606767580".
- Cygnus_X-1 age "5000000".
- Cygnus_X-1 appmagV "8.95".
- Cygnus_X-1 bV "+0.81".
- Cygnus_X-1 class "O9.7Iab".
- Cygnus_X-1 colwidth "30".
- Cygnus_X-1 constell Cygnus_(constellation).
- Cygnus_X-1 e "5".
- Cygnus_X-1 epoch "J2000".
- Cygnus_X-1 hasPhotoCollection Cygnus_X-1.
- Cygnus_X-1 luminosity "3".
- Cygnus_X-1 mass "14".
- Cygnus_X-1 pError "0.033".
- Cygnus_X-1 parallax "0.539".
- Cygnus_X-1 propMoDec "−7.15".
- Cygnus_X-1 propMoRa "−3.37".
- Cygnus_X-1 radialV "−13".
- Cygnus_X-1 radius "20".
- Cygnus_X-1 u "km".
- Cygnus_X-1 uB "−0.30".
- Cygnus_X-1 variable Variable_star.
- Cygnus_X-1 subject Category:Binary_stars.
- Cygnus_X-1 subject Category:Cygnus_(constellation).
- Cygnus_X-1 subject Category:Henry_Draper_Catalogue_objects.
- Cygnus_X-1 subject Category:O-type_supergiants.
- Cygnus_X-1 subject Category:Objects_named_with_variable_star_designations.
- Cygnus_X-1 subject Category:Objects_within_10_kly_of_Earth.
- Cygnus_X-1 subject Category:Stellar_black_holes.
- Cygnus_X-1 subject Category:X-ray_binaries.
- Cygnus_X-1 type CelestialBody.
- Cygnus_X-1 type Star.
- Cygnus_X-1 type PhysicalBody.
- Cygnus_X-1 comment "Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source and black hole candidate in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 2.3×10−23 W m−2 Hz−1 (2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole candidate and it remains among the most studied astronomical objects in its class.".
- Cygnus_X-1 label "Cygnus X-1".
- Cygnus_X-1 label "Cygnus X-1".
- Cygnus_X-1 label "Cygnus X-1".
- Cygnus_X-1 label "Cygnus X-1".
- Cygnus_X-1 label "Cygnus X-1".
- Cygnus_X-1 label "Cygnus X-1".
- Cygnus_X-1 label "Cygnus X-1".
- Cygnus_X-1 label "Cygnus X-1".
- Cygnus_X-1 label "Лебедь X-1".
- Cygnus_X-1 label "نجم الدجاجة إكس-1".
- Cygnus_X-1 label "はくちょう座X-1".
- Cygnus_X-1 label "天鵝座X-1".
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs はくちょう座X-1.
- Cygnus_X-1 sameAs 백조자리_X-1.
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs Cygnus_X-1.
- Cygnus_X-1 sameAs m.0lt5h.
- Cygnus_X-1 sameAs Q332674.
- Cygnus_X-1 sameAs Q332674.
- Cygnus_X-1 wasDerivedFrom Cygnus_X-1?oldid=606767580.
- Cygnus_X-1 depiction Cygnus_IAU.svg.
- Cygnus_X-1 isPrimaryTopicOf Cygnus_X-1.
- Cygnus_X-1 name "Cygnus X-1/HDE 226868".