SDSS J120136.02+300305.5

SDSS J120136.02+300305.5 is an optically inactive, quiescent galaxy that possibly contains a milliparsec supermassive black hole binary.[1][2]

Discovery

X-ray fluxes in the galaxy were first detected in June 2010 with a flux 56 times higher than an upper limit from ROSAT, corresponding to LX ~ 3 × 1044 erg s−1.[3] It had the rough optical spectrum of quiescent galaxy. All in all, the flux evolved in fair consistency with the normal t−5/3 model, something that would be normal for returning stellar debris, before fading by a factor of roughly 300 after 300 days.[3] However, the source was incredibly volatile, becoming invisible between 27–48 days after discovery. It may have matched a Bremsstrahlung or double-power-law model and usually softens as time passes.

References

  1. ^ Liu, F. K.; Li, Shuo; Komossa, S. (2014-05-01), A milliparsec supermassive black hole binary candidate in the galaxy SDSS J120136.02+300305.5, arXiv, doi:10.48550/arXiv.1404.4933, arXiv:1404.4933, retrieved 2025-11-08
  2. ^ Liu, F. K.; Li, Shuo; Komossa, S. (2014-04-22). "A MILLIPARSEC SUPERMASSIVE BLACK HOLE BINARY CANDIDATE IN THE GALAXY SDSS J120136.02+300305.5". The Astrophysical Journal. 786 (2): 103. doi:10.1088/0004-637X/786/2/103. ISSN 0004-637X.
  3. ^ a b Saxton, R. D.; Read, A. M.; Esquej, P.; Komossa, S.; Dougherty, S.; Rodriguez-Pascual, P.; Barrado, D. (2012-05-01). "A tidal disruption-like X-ray flare from the quiescent galaxy SDSS J120136.02+300305.5". Astronomy & Astrophysics. 541: A106. doi:10.1051/0004-6361/201118367. ISSN 0004-6361.
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