Astronomy:PSR J0540-6919

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Coordinates: Sky map 05h 40m 10.84s, −69° 19′ 54.2″

PSR J0540-6919
PSR B0540-69
Observation data
Equinox J2000.0]] (ICRS)
Constellation Dorado
Right ascension  05h 40m 10.84s[1]
Declination −69° 19′ 54.2″[1]
Spectral type Pulsar
Variable type Pulsar
Distance163,000[2] ly
(50,000[2] pc)
Other designations
PSR J0540-6919,[1] PSR B0540-69,[1] PKS 0540-693[1]
Database references

PSR J0540-6919[1] (PSR B0540-69)[1] is a pulsar in the Tarantula Nebula of the Large Magellanic Cloud.[3] It is the first extragalactic gamma-ray pulsar discovered.[4]


This Crab-like pulsar was first discovered in X-rays in 1984[5] and subsequently detected at radio wavelengths.[6] Astronomers initially attributed the glow to collisions of subatomic particles accelerated in the shock waves produced by supernova explosions, and it took more than six years of observations by Fermi's Large Area Telescope to detect gamma-ray pulsations from J0540-6919.[7]

In 2015, it was determined that J0540-6919 is responsible for about half of the gamma-ray flux from the Tarantula Nebula in the Large Magellanic Cloud.[7] It was identified as a bright source of gamma radiation early in the Fermi mission.

See also


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "PSR J0540-6919". SIMBAD. Centre de données astronomiques de Strasbourg. 
  2. 2.0 2.1 Richard Gray (12 November 2015). "The 'lighthouse' from another galaxy: Brightest ever gamma-ray pulsar is the first to be spotted OUTSIDE the Milky Way". Daily Mail (London). 
  3. Crawford, Fronefield et al. (May 20, 2001). "Radio Pulsars in the Magellanic Clouds". The Astrophysical Journal 553: 367–374. doi:10.1086/320635. Bibcode2001ApJ...553..367C. Retrieved 2015-11-14. 
  4. NASA/Goddard Space Flight Center (13 November 2015). "First gamma-ray pulsar detected in another galaxy". Science Daily. 
  5. Seward, F. D.; Harnden, F. R. Jr.; Helfand, D. J. (January 20, 1984). "Discovery of a 50 millisecond pulsar in the Large Magellanic Cloud". The Astrophysical Journal Letters 287: L19-L22. doi:10.1086/184388. Bibcode1984ApJ...287L..19S. 
  6. Manchester, R. N. et al. (January 20, 1993). "Radio detection of PSR B0540-69". The Astrophysical Journal Letters 403: L29-L32. doi:10.1086/186714. Bibcode1993ApJ...403L..29M. Retrieved 2016-01-11. 
  7. 7.0 7.1 "Fermi Satellite Detects First Gamma-Ray Pulsar in Another Galaxy". NASA (SpaceRef). 12 November 2015. Retrieved 2015-11-14.