SDSSJ092712.65+294344.0: a candidate massive black hole binary

SDSSJ092712.65+294344.0: a candidate massive black hole binary

In this Letter, we explore the hypothesis that the quasar SDSSJ092712.65+294344.0 is hosting a massive black hole binary embedded in a circumbinary disc. The lightest, secondary black hole is active, and gas orbiting around it is responsible for the blue-shifted broad emission lines with velocity of...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society. Letters 2009-09, Vol.398 (1), p.L73-L77
Hauptverfasser: Dotti, M., Montuori, C., Decarli, R., Volonteri, M., Colpi, M., Haardt, F.
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black hole physics
galaxies: kinematics and dynamics
galaxies: nuclei
quasars: individual: SDSSJ092712.65+294344.0
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container_issue 1
container_start_page L73
container_title Monthly notices of the Royal Astronomical Society. Letters
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creator Dotti, M.
Montuori, C.
Decarli, R.
Volonteri, M.
Colpi, M.
Haardt, F.
description In this Letter, we explore the hypothesis that the quasar SDSSJ092712.65+294344.0 is hosting a massive black hole binary embedded in a circumbinary disc. The lightest, secondary black hole is active, and gas orbiting around it is responsible for the blue-shifted broad emission lines with velocity off-set of 2650 km s−1, relative to the galaxy rest frame. As the tidal interaction of the binary with the outer disc is expected to excavate a gap, the blue-shifted narrow emission lines are consistent with being emitted from the low-density inhomogeneous gas of the hollow region. From the observations, we infer a binary mass ratio q≈ 0.3, a mass for the primary of M1≈ 2 × 109 M⊙, and a semimajor axis of 0.34 pc, corresponding to an orbital period of 370 years. We use the results of cosmological merger trees to estimate the likelihood of observing SDSSJ092712.65+294344.0 as recoiling black hole or as a binary. We find that the binary hypothesis is preferred being 100 times more probable than the ejection hypothesis. If SDSSJ092712.65+294344.0 hosts a binary, it would be the one closest massive black hole binary system ever discovered.
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source Wiley Online Library Journals Frontfile Complete; Oxford Journals Open Access Collection; Alma/SFX Local Collection
subjects black hole physics
galaxies: kinematics and dynamics
galaxies: nuclei
quasars: individual: SDSSJ092712.65+294344.0
title SDSSJ092712.65+294344.0: a candidate massive black hole binary
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