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

Thumbnail Image

Date

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Description

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

Keywords

Astrophysics

Citation

URI

http://salesiana.dossiersoluciones.com/handle/123456789/164965

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0807.2427
 http://arxiv.org/abs/0807.2427

Collections

arXiv