Astronomy:Great Annihilator

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Short description: Microquasar


Great Annihilator
Observation data
Equinox J2000.0]] (ICRS)
Constellation Ophiuchus
Right ascension  17h 43m 54.83s[1]
Declination −29° 44′ 42.6″[1]
Astrometry
Distance16,000 ly
(5,000[2] pc)
Database references
SIMBADdata

1E1740.7-2942, or the Great Annihilator,[3][4] is a Milky Way microquasar, located near the Galactic Center on the sky.[5][2] It likely consists of a black hole and a companion star. It is one of the brightest X-ray sources in the region around the Galactic Center.[6]

The object was first detected in soft X-rays by the Einstein Observatory,[7] and later detected in hard X-rays by the Soviet Granat space observatory.[2] Followup observations by the SIGMA detector on board Granat showed that the object was a variable emitter of massive amounts of photon pairs at 511 keV, which usually indicates the annihilation of an electron-positron pair.[8][9] This led to the nickname, "Great Annihilator."[10] Early observations also showed a spectrum similar to that of the Cygnus X-l, a black hole with a stellar companion, which suggested that Great Annihilator was also a stellar mass black hole.[8]

The object also has a radio source counterpart that emits jets approximately 1.5 pc (5 ly) long.[11] These jets are probably synchrotron emission from positron-electron pairs streaming out at high velocities from the source of antimatter. Modeling of the observed precession of these jets gives an object distance of approximately 5 kpc (or 16,000 ly).[2] This means that while the object is likely located along our line of sight towards the center of the Milky Way, it may be closer to us than Sagittarius A*, the black hole at the center of our galaxy.

References

  1. ↑ 1.0 1.1 "NAME Great Annihilator". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Great+Annihilator. 
  2. ↑ 2.0 2.1 2.2 2.3 Luque-Escamilla, Pedro L.; Martí, Josep; Martínez-Aroza, José (2015-12-01). "The precessing jets of 1E 1740.7−2942" (in en). Astronomy & Astrophysics 584: A122. doi:10.1051/0004-6361/201527238. ISSN 0004-6361. 
  3. ↑ Sunyaev, R. A.; Borozdin, K. N.; Aleksandrovich, N. L.; Arefev, V. A.; Kaniovskii, A. S.; Efremov, V. V.; Maisack, M.; Reppin, C. et al. (November 1994). "Observations of X-ray novae in Vela (1993), Ophiuchus (1993), and Perseus (1992) using the instruments of the Mir-Kvant module". Astronomy Letters 20 (6): 777. Bibcode: 1994AstL...20..777S. 
  4. ↑ Odenwald, Sten (1997). "What do we know about the 'Great Annihilator' in the center of the Milky Way?". http://www.astronomycafe.net/qadir/q1632.html. 
  5. ↑ Mirabel, I. F.. "The Great Annihilator in the Central Region of the Galaxy". eso.org. pp. 51–54. https://www.eso.org/sci/publications/messenger/archive/no.70-dec92/messenger-no70-51-54.pdf. 
  6. ↑ Stecchini, Paulo Eduardo; Castro, Manuel; Jablonski, Francisco; D’Amico, Flavio; Braga, João (2017-06-30). "Tandem Swift and INTEGRAL Data to Revisit the Orbital and Superorbital Periods of 1E 1740.7–2942". The Astrophysical Journal 843 (1): L10. doi:10.3847/2041-8213/aa7942. ISSN 2041-8213. Bibcode: 2017ApJ...843L..10S. 
  7. ↑ Hertz, P.; Grindlay, J. E. (1984-03-01). "The Einstein galactic plane survey : statistical analysis of the complete X-ray sample.". The Astrophysical Journal 278: 137–149. doi:10.1086/161775. ISSN 0004-637X. Bibcode: 1984ApJ...278..137H. https://ui.adsabs.harvard.edu/abs/1984ApJ...278..137H. 
  8. ↑ 8.0 8.1 Sunyaev, R.; Churazov, E.; Gilfanov, M.; Pavlinsky, M.; Grebenev, S.; Babalyan, G.; Dekhanov, I.; Khavenson, N. et al. (December 1991). "Three spectral states of 1E 1740.7-2942 – From standard Cygnus X-1 type spectrum to the evidence of electron-positron annihilation feature" (in en). The Astrophysical Journal 383: L49. doi:10.1086/186238. ISSN 0004-637X. Bibcode: 1991ApJ...383L..49S. 
  9. ↑ Bouchet, L.; Mandrou, P.; Roques, J. P.; Vedrenne, G.; Cordier, B.; Goldwurm, A.; Lebrun, F.; Paul, J. et al. (December 1991). "Sigma discovery of variable e(+)–e(−) annihilation radiation from the near Galactic center variable compact source 1E 1740.7-2942" (in en). The Astrophysical Journal 383: L45. doi:10.1086/186237. ISSN 0004-637X. 
  10. ↑ "Milky Way Monster" (in en-US). Time. 1992-07-27. ISSN 0040-781X. http://content.time.com/time/magazine/article/0,9171,976098,00.html. 
  11. ↑ Mirabel, I. F.; Rodríguez, L. F.; Cordier, B.; Paul, J.; Lebrun, F. (July 1992). "A double-sided radio jet from the compact Galactic Centre annihilator 1E1740.7–2942" (in en). Nature 358 (6383): 215–217. doi:10.1038/358215a0. ISSN 0028-0836. Bibcode: 1992Natur.358..215M. 



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