Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710606c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #106.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The newly discovered broad Halpha emission line in the nuclear spectrum of M94, which is unambiguously associated with X-ray, radio, and variable UV compact source detections, identifies this object as one of the least luminous accretion-type LINERs discovered thus far, and therefore, an important example of accretion at extremely low levels. Its true nature remains however ambiguous, mainly because of our inability to estimate its black hole mass. We present our comparison of four independent black hole mass estimates that reveal a discrepancy of two orders of magnitude between the value predicted by the Mbh-sigma relation and the value toward which methods based on emission activity in optical, mid-IR and X-rays, converge. If M94's black hole mass obeys these three latter methods that have not been verified in the low luminosity regime exhibited by this system, we have revealed the best case for an actively accreting intermediate mass black hole. In addition, this object would clearly violate the M-sigma relation. We discuss possible resolutions of this conundrum.
Constantin Anca
Seth Anil C.
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