Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 379, Issue 4, Pages 1519-1532Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2007.12071.x
Keywords
black hole physics; radiation mechanisms; non-thermal; Galaxy : nucleus; galaxies : active; galaxies : jets
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Despite significant strides made towards understanding accretion, outflow and emission processes in the Galactic Centre supermassive black hole Sagittarius A*, the presence of jets has been neither rejected nor proven. We investigate here whether the combined spectral and morphological properties of the source at radio through near-infrared wavelengths are consistent with the predictions for inhomogeneous jets. In particular, we construct images of jets at a wavelength of 7 mm based on models that are consistent with the spectrum of Sgr A*. We then compare these models through closure quantities with data obtained from the Very Long Baseline Array at 7 mm. We find that the best-fitting jet models give comparable or better fits than the best-fitting Gaussian models for the intrinsic source found in previous analyses. The best-fitting jet models are bipolar, are highly inclined to the line of sight (theta greater than or similar to 75 degrees), may favour a position angle on the sky of 105 degrees and have compact bases with sizes of a few gravitational radii.
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