ESTIMATING THE PARAMETERS OF SAGITTARIUS A*'s ACCRETION FLOW VIA MILLIMETER VLBI
نویسندگان
چکیده
منابع مشابه
Estimating the Parameters of Sgr A*’s Accretion Flow via Millimeter Vlbi
Recent millimeter-VLBI observations of Sagittarius A* (Sgr A*) have, for the first time, directly probed distances comparable to the horizon scale of a black hole. This provides unprecedented access to the environment immediately around the horizon of an accreting black hole. We leverage both existing spectral and polarization measurements and our present understanding of accretion theory to pr...
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Millimeter very long baseline interferometry (mm-VLBI) provides the novel capacity to probe the emission region of a handful of supermassive black holes on sub-horizon scales. For Sagittarius A∗ (Sgr A∗), the supermassive black hole at the center of the Milky Way, this provides access to the region in the immediate vicinity of the horizon. Broderick et al. have already shown that by leveraging ...
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The vicinity of the supermassive black hole associated with the compact radio source Sagittarius (Sgr) A* is believed to dominate the observed emission at wavelengths near and shorter than ∼ 1 millimeter. We show that a general relativistic accretion flow, heated via the plasma wave heating mechanism, is consistent with the polarization and recent mm-VLBI observations of Sgr A* for an inclinati...
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Millimeter wave very long baseline interferometry (mm-VLBI) provides access to the emission region surrounding Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way, on sub-horizon scales. Recently, a closure phase of 0◦ ± 40◦ was reported on a triangle of Earth-sized baselines (SMT–CARMA–JCMT) representing a new constraint upon the structure and orientation of the...
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We discuss possibilities and improvements which could be obtained, if a phased array with a large number (N= 50 − 100) of sub-millimeter antennas – like the planned large southern array (LSA) – is used for radio-interferometry with very long baselines (VLBI) at millimeter wavelengths. We find that the addition of such an instrument will push the detection limit and the imaging capabilities of a...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2009
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/697/1/45