Astronomy:IGR J17091-3624

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Coordinates: Sky map 17h 09m 07.92s, −36° 24′ 25.20″

IGR J17091-3624
Igr j17091.jpg
Artist's impression of the binary system of IGR J17091-3624
Observation data
Equinox J2000.0]] (ICRS)
Constellation Scorpius
Right ascension  17h 09m 08.0s[1]
Declination −36° 24′ 24″[1]
Other designations
SWIFT J1709.8-3627B, INTEGRAL1 44, CXOU J170907.6-362425
Database references
SIMBADdata

IGR J17091-3624 (also IGR J17091) is a stellar mass black hole 28,000 light-years away. It lies in the constellation Scorpius in the Milky Way galaxy.[2]

Discovery

IGR J17091 was discovered by ESA's INTEGRAL satellite in April 2003.[3]

Description

IGR J17091 is a stellar mass black hole with a mass between 3 and 10 M. It is a binary system in which a star orbits the black hole.[4] Its small size may make it a candidate for the smallest black hole discovered.[5] However, as of 2017 its mass was described as "unknown".[6]

Observations by the Chandra X-ray Observatory in 2011 discovered that it produces the fastest winds ever coming from an accretion disk at 20 million mph (3% of the speed of light). This is 10 times faster than the next-highest-measured wind speed. According to Ashley King from the University of Michigan "Contrary to the popular perception of black holes pulling in all of the material that gets close, we estimate up to 95 percent of the matter in the disk around IGR J17091 is expelled by the wind."[7]

IGR J17091 also exhibits peculiar X-ray variability patterns or "heartbeats" which are small, quasi-periodic, outbursts repeated over a 5- to 70-second timescale.[8] Similar variability has only been observed in the black hole GRS 1915+105; however, IGR J17091's outbursts are 20 times fainter.[9]

See also

References

  1. 1.0 1.1 "IGR J17091-3624". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=IGR+J17091-3624. 
  2. Ashley King (February 21, 2012). "IGR J17091: Chandra Finds Fastest Winds". NASA/Harvard. http://chandra.harvard.edu/photo/2012/igr/. 
  3. Erik Kuulkers (April 19, 2003). "IGR J17091-3624". http://www.astronomerstelegram.org/?read=149. 
  4. Ashley King (February 21, 2012). "Chandra Finds Fastest Winds from Stellar Black Hole". NASA. http://chandra.harvard.edu/press/12_releases/press_022112.html. 
  5. Charles Q. Choi (August 24, 2012). "Strangest Black Holes in the Universe, pg 9". "Space.com". http://www.space.com/15941-strangest-black-holes-universe-countdown.html. 
  6. Xu, Y.; García, J.A.; Fürst, F.; Harrison, F.A.; Walton, D.J.; Tomsick, J.A.; Bachetti, M.; King, A.L. et al. (2017). "Spectral and Timing Properties of IGR J17091–3624 in the Rising Hard State During Its 2016 Outburst". The Astrophysical Journal 851 (2): 103. doi:10.3847/1538-4357/aa9ab4. 
  7. Ashley King (February 21, 2012). "Chandra Finds Fastest Winds from Stellar Black Hole". NASA. http://chandra.harvard.edu/press/12_releases/press_022112.html. 
  8. Rao, Anjali; Vadawale, S. V. (12 September 2012). Why is IGR J17091–3624 so faint?. p. 1. doi:10.1088/2041-8205/757/1/L12. Bibcode2012ApJ...757L..12R. 
  9. Rao, Anjali; Vadawale, S. V. (12 September 2012). Why is IGR J17091–3624 so faint?. p. 2. doi:10.1088/2041-8205/757/1/L12. Bibcode2012ApJ...757L..12R. 

External links