Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI

Details Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI

2008-07-15

arxiv.org/abs/0807.2427v1

Astronomy and Astrophysics

Astrophysics

4 pages PDF including 1 color figure, accepted for presentation at the XXIX URSI General Assembly

Scientific paper

Multiwavelength monitoring observations of Sagittarius A* exhibit variability on timescales of minutes to hours, indicating emission regions localized near the event horizon. (Sub)Millimeter-wavelength VLBI is uniquely suited to probe the environment of the assumed black hole on these scales. We consider a range of orbiting hot-spot and accretion-disk models and find that periodicity in Sgr A* flares is detectable using closure quantities. Our methods are applicable to any model producing source structure changes near the black hole, including jets and magnetohydrodynamic disk instabilities, and suggest that (sub)millimeter VLBI will play a prominent role in investigating Sgr A* near the event horizon.

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