GRS 1915 + 105

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Double star
GRS 1915 + 105; V1487 Aquilae
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Eagle
Right ascension 19 h 15 m 11.56 s
declination + 10 ° 56 ′ 44.9 ″
Typing
Astrometry
Physical Properties
Other names
and catalog entries
Other names Nova Aql 1992, Swift J1915.3 + 1057, Swift J1915.1 + 1056
A sequence of the Merlin system over several days

GRS 1915 + 105 , also V1487 Aquilae , is a binary X-ray star system which consists of a normal star and a black hole . It was discovered on August 15, 1992 by the Granat satellite .

description

GRS is the abbreviation for "GRANAT Source", "1915" is the right ascension (19 hours and 15 minutes) and "105" is the declination in 0.1 ° (declination is 10.5 °). The system is 11,000 parsecs from Earth in the constellation of the eagle (Aquila). GRS 1915 + 105 is the heaviest black hole discovered in the Milky Way with 10-18 times the mass of the Sun. At the same time, the system is a microquasar and it appears that the black hole rotates around itself 1150 times per second. 1994 GRS was 1915 + 105, the first galactic source, which was discovered at the seemingly material with superluminal called superluminal speed or is expelled.

Jets

Observations with high-resolution telescopes such as the VLA or the VLBi show an exit of charged particles from both poles, which emit synchrotron radiation. Studies have shown that the apparently faster than light movement occurs due to the relativistic effect , also known as aberration , when the speed is over 90% of the current speed of light.

Size regulation

Repeated observations by Chandra over a decade have shown that there is a "size regulating mechanism" in GRS 1915 + 105. The jet is irregularly interrupted by hot “wind” from the accretion disk . The wind suppresses the transport of the material. As soon as the wind dies down, the jets arise again.

Web links

Individual evidence

  1. ↑ V1487 Aql. In: VSX. AAVSO, accessed November 2, 2018 .
  2. ↑ IAU Circular No. 5590. Daniel WE Green, August 17, 1992, accessed August 26, 2019 .
  3. ^ A b R.P. Fender, ST Garrington, DJ McKay, TWB Muxlow, GG Pooley, RE Spencer, AM Stirling, EB Waltman: MNRAS, 1999, 304, 865 , bibcode : 1999MNRAS.304..865F
  4. ↑ A Very Massive Stellar Black Hole in the Milky Way Galaxy. ESO, November 28, 2001, accessed August 26, 2019 .
  5. ↑ GRS 1915 + 105 arxiv : astro-ph / 0111540
  6. ↑ Black hole spins at the limit . ( Memento of May 7, 2012 in the Internet Archive ) COSMOS magazine
  7. ^ IF Mirabel, LF Rodríguez: Nat, 1994, 371, 46
  8. ↑ An Erratic Black Hole Regulates Itself. NASA, March 25, 2009, accessed March 25, 2009 .