Great Annihilator

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Great Annihilator
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ophiuchus
Right ascension 17h 43m 54.83s[1]
Declination −29° 44′ 42.6″[1]
Spectral type Red giant + Black hole[2]
Database references

1E1740.7-2942, or the Great Annihilator,[3][4] is a large black hole thought to be located in the core region of the Milky Way, near the supermassive black hole Sgr A* at the Galactic Center.[5] It is one of the brightest gamma ray sources found in the Milky Way, producing massive amounts of photon pairs at 511 keV, which usually indicates the annihilation of an electron-positron pair. The Great Annihilator also has a radio source counterpart that emits jets approximately three light-years long. These jets are probably synchrotron emissions from positron-electron pairs streaming out at high velocities from the source of antimatter.


  • Ghez, A. M.; Duchene, G.; Matthews, K.; Hornstein, S. D.; Tanner, A.; Larkin, J.; Morris, M.; Becklin, E. E.; Salim, S.; Kremenek, T.; Thompson, D.; Soifer, B. T.; Neugebauer, G.; McLean, I. (2003). "The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth". Astrophysical Journal. 586 (2): L127–L131. Bibcode:2003ApJ...586L.127G. arXiv:astro-ph/0302299Freely accessible. doi:10.1086/374804. 
  • "Milky Way Monster". Time Inc. 27 July 1992. Retrieved 4 August 2014. 


  1. ^ a b "NAME Great Annihilator". SIMBAD. Centre de données astronomiques de Strasbourg. 
  2. ^ Smith, D. M. (2002). "Orbital and Superorbital Periods of 1E 1740.7-2942 and GRS 1758-258". The Astrophysical Journal. 578 (2). Bibcode:2002ApJ...578L.129S. arXiv:astro-ph/0209255Freely accessible. doi:10.1086/344701. 
  3. ^ Sunyaev, R. A.; Borozdin, K. N.; Aleksandrovich, N. L.; Arefev, V. A.; Kaniovskii, A. S.; Efremov, V. V.; Maisack, M.; Reppin, C.; Skinner, J. K. (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?". Astronomy Cafe. Archived from the original on 16 January 2013. Retrieved 4 August 2014. 
  5. ^ Mirabel, I. F. "The Great Annihilator in the Central Region of the Galaxy" (PDF). pp. 51–54.