Flaring activity of sgr A*

Expanding hot blobs

F. Yusef-Zadeh, M. Wardle, D. A. Roberts, C. O. Heinke, C. D. Dowell, W. D. Cotton, G. C. Bower, F. K. Baganoff

Research output: Contribution to journalArticle


Sgr A* is considered to be a massive black hole at the Galactic center and is known to be variable in radio, millimeter, near-IR and X-rays. Recent multi-wavelength observing campaigns show a simultaneous X-ray and near-IR flare, as well as sub-millimeter and near-IR flares from Sgr A*. The flare activity is thought to be arising from the innermost region of Sgr A*. We have recently argued that the duration of flares in near-IR and submillimeter wavelengths implies that the burst of emission expands and cools on a dynamical time scale before the flares leave Sgr A*. The detection of radio flares with a time delay in the range of 20 and 40 minutes between 7 and 12mm peak emission implies adiabatic expansion of a uniform, spherical hot blob due to flare activity. We suspect that this simple outflow picture shows some of the characteristics that are known to take place in microquasars, thus we may learn much from comparative study of Sgr A* and its environment vs. microquasars.

Original languageEnglish
Pages (from-to)1-17
Number of pages17
JournalInternational Conference Recent Advances in Natural Language Processing, RANLP
Publication statusPublished - 2006

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    Yusef-Zadeh, F., Wardle, M., Roberts, D. A., Heinke, C. O., Dowell, C. D., Cotton, W. D., ... Baganoff, F. K. (2006). Flaring activity of sgr A*: Expanding hot blobs. International Conference Recent Advances in Natural Language Processing, RANLP, 1-17.