Astronomy:GX 339-4

From HandWiki
Short description
Star in the constellation Ara
GX 339-4
Flaring Black Hole.jpg
GX 339-4 (artist's concept)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Ara
Right ascension 17 02 49.5
Declination -48 47 23
Apparent magnitude (B) 16.3
Apparent magnitude (V) 15.5
Apparent magnitude (J) 15.9
Apparent magnitude (H) 15.4
Apparent magnitude (K) 15.0
Variable type LMXB
Other designations
V821 Ara, 4U 1658-48, 3A 1659-487, 1RXS J170248.5-484719, 2MASS 17024936-4847228

GX 339-4 is a moderately strong variable galactic low-mass X-ray binary (LMXB) source[1][2] and black-hole candidate that flares from time to time. From spectroscopic measurements, the mass of the black-hole was found to be at least of 5.8 solar masses.[3]

During the outbursts GX 339-4 shows evolution of quasi-periodic oscillations (QPOs). In the rising phase the QPO frequency monotonically increase as the CENBOL propagates closer to the black hole and in the declining phase the QPO frequency monotonically decreases since the CENBOL recedes away from the black hole after viscosity is decreased. The frequency variation is thus well modeled by the propagating and oscillating shock in the sub-Keplerian flow. The entire spectrum also fits very well using two component advective flow solution.

A strong, variable relativistic jet, emitting from radio to infrared wavelengths was observed by several studies.[4][5][6]


  2. Bradt, H.V.D., and McClintock, J.E., Annu. Rev. Astron. Astrophys., 21, 13-66 (1983)
  3. Hynes, R. I.; Steeghs, D.; Casares, J.; Charles, P. A.; O'Brien, K. (February 2003). "Dynamical Evidence for a Black Hole in GX 339-4". The Astrophysical Journal 583 (2, pp. L95–L98): L95–L98. doi:10.1086/368108. Bibcode2003ApJ...583L..95H. 
  4. Corbel, S.; Nowak, M. A.; Fender, R. P.; Tzioumis, A. K.; Markoff, S. (March 2003). "Radio/X-ray correlation in the low/hard state of GX 339-4". Astronomy and Astrophysics 400 (3): 1007–1012. doi:10.1051/0004-6361:20030090. Bibcode2003A&A...400.1007C. 
  5. Casella, P.; Maccarone, T. J.; O'Brien, K.; Fender, R. P.; Russell, D. M.; van der Klis, M.; Pe'Er, A.; Maitra, D. et al. (May 2010). "Fast infrared variability from a relativistic jet in GX 339-4". Monthly Notices of the Royal Astronomical Society: Letters 404 (1, pp. L21–L25): L21–L25. doi:10.1111/j.1745-3933.2010.00826.x. Bibcode2010MNRAS.404L..21C. 
  6. Gandhi, P.; Blain, A. W.; Russell, D. M.; Casella, P.; Malzac, J.; Corbel, S.; D'Avanzo, P.; Lewis, F. W. et al. (October 2011). "A Variable Mid-infrared Synchrotron Break Associated with the Compact Jet in GX 339-4". The Astrophysical Journal Letters 740 (1, article id. L13, 7 pp): L13. doi:10.1088/2041-8205/740/1/l13. Bibcode2011ApJ...740L..13G. 

External links