Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21430305t&link_type=abstract
American Astronomical Society, AAS Meeting #214, #303.05; Bulletin of the American Astronomical Society, Vol. 41, p.720
Other
Scientific paper
The radio galaxy 0402+379 is the most compact supermassive binary black hole system to be directly imaged by more than two orders of magnitude. Our recent Global VLBI observations of this radio galaxy reveal two absorption lines toward the southern jet of the source, one redshifted by 370 +/- 10 km/s and the other blueshifted by 700 +/- 10 km/s with respect to the systemic velocity. These observations, along with the results obtained for the opacity distribution, suggests the presence of two mass clumps rotating around the central region of the source. We propose a model consisting of a geometrically thick disk, of which we only see a couple of clumps, that reproduces the velocities measured from the HI absorption profiles. We find an upper limit for the inclination angle of the twin jets to the line-of-sight of 66 degrees, which, according to the proposed model, implies a lower limit on the central mass of 7 x 10^8 solar masses and a lower limit for the scale height of the thick disk of 12 pc. This gas disk may play an important role in hardening the orbit of the binary system. Furthermore, this so-far unique HI signature may be a signpost useful in the search for similar systems.
Peck Alison
Pihlstrom Ylva
Pollack L.
Rodriguez Carlos
Romani Roger
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