V404 Cygni (V404 Cygni) is a binary star system of Cygni , consisting of a black hole with a mass of about 12 ± 3 solar masses [4] and a star of spectral class G or K. These two objects rotate around each other every 6.474 days [5] for enough close range. Because of their proximity, the star is deformed by the gravity of the black hole and loses mass in it.
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The letter “V” in the name indicates that it is a variable star , the brightness of which varies with time. It is also considered new , because at least three times in the 20th century it produced a bright burst of energy (1938, 1956 and 1989). Finally, it is x-ray new , as it periodically emits short bursts of x-ray radiation.
It has been suggested that the more massive component of the system may be a Q-star , rather than a black hole .
In 2009, the black hole in the X-ray new V404 Cygnus was the first black hole to have an accurate parallax measurement to determine the distance from our solar system; distance 2.39 ± 0.14 kiloparsec or 7.80 ± 0.46 thousand St. years [6] .
Content
- 1 Opening
- 2 2015 Flash
- 3 Images
- 4 notes
- 5 Links
Opening
On May 21, 1989, the Japanese satellite Ginga discovered a new X-ray source, which was cataloged as GS 2023 + 338. On May 27, he was connected due to his location with the optical star V404 Cygnus [5] .
2015 Flash
On June 15, 2015, NASA's SWIFT spacecraft recorded the first signs of a resumption of activity. On June 17, ESA Integral Gamma Observatory began monitoring outbreaks. The integral detected “repeated bright flashes of light on a time scale of less than an hour, which is rare for other systems with black holes”, and flashes of the X-ray new V404 Swan became the brightest object in the X-ray sky - up to fifty times brighter than the Crab nebula . This outbreak is the first since 1989. The event was of great importance, optical observations were carried out at several ground-based observatories, which ultimately resulted in great international cooperation led by Japanese astrophysicist Mariko Kimura from Kyoto University . On January 7, 2016, an article was published in the scientific journal Nature , which became the result of the work of this collaboration [7] .
Amateur astronomers also actively observed this outbreak [8] [9] .
Other outbreaks occurred in 1938 and 1956, and are probably caused by matter accumulating in the disk around the black hole [10] .
Images
Gal. Longitude 73.1187 °
Gal. Latitude -2.0915 °
Distance 7800 St. years
Some black holes closest to the sun
Notes
- ↑ 1 2 G. Nelemans THE FIRST ACCURATE PARALLAX DISTANCE TO A BLACK HOLE // Astrophys. J. / E. Vishniac - IOP Publishing , 2009. - Vol. 706, Iss. 2. - P. L230 – L234. - ISSN 0004-637X ; 1538-4357 - doi: 10.1088 / 0004-637X / 706/2 / L230
- ↑ Liu Q. Z., J. van Paradijs, EPJ van den Heuvel A catalog of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition) // Astron. Astrophys. - EDP Sciences , 2007. - Vol. 469, Iss. 2. - P. 807–810. - ISSN 0004-6361 ; 0365-0138 ; 1432-0746 ; 1286-4846 - doi: 10.1051 / 0004-6361: 20077303
- ↑ SIMBAD Astronomical Database
- ↑ Shahbaz, T .; Ringwald, FA; Bunn, JC; Naylor, T. et al. "The mass of the black hole in V404 Cygni" // MNRAS. - 1994. - No. 271 . - S. L1 — L14 .
- ↑ 1 2 Wagner RM , Kreidl TJ , Howel SB , Starrfield SG Periodic photometric variability of the black hole binary V404 Cygni // The Astrophysical Journal . - IOP Publishing , 1992. - T. 401 , No. 2 . - S. L97 — L100 . - DOI : 10.1086 / 186680 . - .
- ↑ Miller-Jones, JAC; Jonker Dhawan. The first accurate parallax distance to a black hole // The Astrophysical Journal : journal. - IOP Publishing 2009. - Vol. 706 , no. 2 . - P. L230 . - DOI : 10.1088 / 0004-637X / 706/2 / L230 . - . - arXiv : 0910.5253 .
- ↑ Kimura, M. et al. Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni // Nature - Letters. - 2016. - T. 529 , No. 7584 . - S. 54-58 . - DOI : 10.1038 / nature16452 .
- ↑ Black hole-monster absorbs a star whose radiance was observed by a coastal astronomer
- ↑ A young astronomer from Primorye captured a flaming star
- ↑ Kuznetsov Sergey. A black hole devours a star in V404 Swan, becoming the brightest object in space (inaccessible link) . FTimes.ru . FTimes.ru (June 26, 2015). Date of treatment June 26, 2015. Archived December 22, 2015.
Links
- MSU astrophysicists discovered an optical jet in a black hole , July 20, 2017.
- Jets also shine , July 26, 2017