Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21332806d&link_type=abstract
American Astronomical Society, AAS Meeting #213, #328.06; Bulletin of the American Astronomical Society, Vol. 41, p.385
Astronomy and Astrophysics
Astronomy
Scientific paper
SDSS J092712.65+294344.0 is quasar with a very peculiar optical spectrum, exhibiting two distinct sets of lines, at two different redshifts, with an off-set of 2650 km/s. Recently, it has been proposed as first candidate of a recoiling massive black hole. We discuss the alternative hypothesis that SDSSJ092712.65+294344.0 is hosting a massive black hole binary embedded in a circum-binary disc. The lightest, secondary black hole is active and gas swirling around it is responsible for the broad emission lines, blue-shifted 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 of being emitted from the low-density gas in the hollow region. We then estimate the likely-hood of observing SDSSJ092712.65+294344.0 as recoiling black hole or as a binary. We find that the binary hypothesis is preferred being at least one hundred times more probable than the ejection hypothesis. If SDSSJ092712.65+294344.0 hosts a binary, it would be one of the closest massive black hole binaries ever discovered.
Dotti Massimo
Volonteri Marta
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