OGLE-2011-BLG-0462 explained

OGLE-2011-BLG-462
Names:MOA-2011-BLG-191
Type:black hole
Epoch:2455874.50236 (2011-11-09.00 UT)
Ra:J2000.0 (17:51:40.19)
Dec:J2000.0 (-29:53:26.3)
Mass:6.03 M☉
Dist Ly:5,610 ly (1,720 pc)

OGLE-2011-BLG-0462, also known as MOA-2011-BLG-191, is a stellar-mass black hole isolated in interstellar space. OGLE-2011-BLG-0462 lies at a distance of 1,720 parsecs (5,610 light years) in the direction of the galactic bulge in the constellation Sagittarius. The black hole has a mass of about .[1] OGLE-2011-BLG-0462 is the first truly isolated black hole which has been confirmed.[2] [3] [4]

Discovery

OGLE-2011-BLG-0462 was discovered through microlensing when it passed in front of a background star that was 20,000 light years away from Earth. The black hole's gravity bent the star's light, causing a sharp spike in brightness that was detected by the Hubble Space Telescope. It took six years to confirm the existence of OGLE-2011-BLG-0462. Its initial kick velocity has been estimated to have an upper limit of 100 km/s.[5] [6] No significant X-ray emission has been detected from gas accreting onto the black hole indicating that it is truly isolated.[7]

See also

Notes and References

  1. Lam . Casey Y. . Lu . Jessica R. . 2023-10-01 . A Reanalysis of the Isolated Black Hole Candidate OGLE-2011-BLG-0462/MOA-2011-BLG-191 . The Astrophysical Journal . 955 . 2 . 116 . 10.3847/1538-4357/aced4a . free . 2308.03302 . 2023ApJ...955..116L . 0004-637X.
  2. Lam . Casey Y. . Lu . Jessica R. . Udalski . Andrzej . etal . "An Isolated Mass-gap Black Hole or Neutron Star Detected with Astrometric Microlensing" . The Astrophysical Journal Letters. 2022 . 933 . 1 . L23 . 10.3847/2041-8213/ac7442 . 2202.01903 . 2022ApJ...933L..23L . free .
  3. Sahu . Kailash C. . Anderson . Jay . Casertano . Stefano . Bond . Howard E. . Udalski . Andrzej . Dominik . Martin . Calamida . Annalisa . Bellini . Andrea . Brown . Thomas M. . Rejkuba . Marina . Bajaj . Varun . 2022-01-01 . An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing . The Astrophysical Journal . 933 . 1 . 83 . 10.3847/1538-4357/ac739e . 2201.13296. 2022ApJ...933...83S . 246430448 . free .
  4. Web site: 2011-BLG-0462 . 2022-06-29 . ogle.astrouw.edu.pl.
  5. News: Panjkov . Sonja . 2023-01-27 . The Peculiar Nature of Black Hole Birth Kicks . 2023-01-28 . astrobites . en-US.
  6. Andrews . Jeff J. . Kalogera . Vicky . 2022-05-01 . Constraining Black Hole Natal Kicks with Astrometric Microlensing . The Astrophysical Journal . 930 . 2 . 159 . 2203.15156 . 10.3847/1538-4357/ac66d6 . 2022ApJ...930..159A . 247778998 . 0004-637X . free .
  7. Mereghetti . Sandro . Sidoli . Lara . Ponti . Gabriele . Treves . Aldo . 2022-06-01 . X-Ray Observations of the Isolated Black Hole Candidate OGLE-2011-BLG-0462 and Other Collapsed Objects Discovered through Gravitational Microlensing . The Astrophysical Journal . 934 . 1 . 62 . 10.3847/1538-4357/ac7965 . 2206.07480 . 2022ApJ...934...62M . 249674753 . free .

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