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GRS 1915+105
GRS 1915+105 or V1487 Aquilae is an X-ray binary star system which features a regular star and a black hole. It was discovered on August 15, 1992 by the WATCH all-sky monitor aboard Granat.〔(Castro-Tirado, A. J., Brandt, S. and Lund, N. 1992, IAUC 5590, GRS 1915 )〕 "GRS" stands for "GRANAT source", "1915" is the right ascension (19 hours and 15 minutes) and "105" is declination in units of 0.1 degree (i.e. its declination is 10.5 degrees). The near-infrared counterpart was confirmed by spectroscopic observations.〔(Castro-Tirado, A. J. et al. 1996, ApJ 461, L99 Infrared Spectroscopy of the Superluminal Galactic Source GRS 1915+105 during the 1994 September Outburst )〕 The binary system lies 11,000 parsecs away〔(Fender R. P., Garrington S. T., McKay D. J., Muxlow T. W. B., Pooley G. G., Spencer R. E., Stirling A. M., Waltman E. B., 1999, MNRAS, 304, 865 )〕 in Aquila. GRS 1915+105 is the heaviest of the stellar black holes so far known in the Milky Way Galaxy,〔(A Very Massive Stellar Black Hole in the Milky Way Galaxy ) November 28, 2001 (ESO)〕 with 10 to 18 times the mass of the Sun.〔(GRS 1915+105 )〕 It is also a microquasar, and it appears that the black hole may rotate at 1,150 times per second.〔(Black hole spins at the limit | COSMOS magazine )〕
== Galactic superluminal source ==
In 1994, GRS 1915+105 became the first known galactic source that ejects material with apparent faster-than-light or superluminal velocities.〔(Mirabel I. F., Rodríguez L. F., 1994, Nat, 371, 46 )〕
Observations with high resolution radio telescopes such as VLA, MERLIN, and VLBI show a bi-polar outflow of charged particles, which emit synchrotron radiation at radio frequencies. These studies have shown that the apparent superluminal motion is due to a relativistic effect known as relativistic aberration, where the intrinsic velocity of ejecta is actually about 90% the speed of light.〔
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