Short-term variability of Sgr A*

Details Short-term variability of Sgr A* Short-term variability of Sgr A*

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..195m&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

Other

1

Scientific paper

Observations of Sgr A* over the past 4 years with the Keck Telescope in the near-infrared, coupled with millimeter and submillimeter observations, show that the 3.7 x 106 M[8] Galactic Black Hole, Sagittarius A*, displays continuous variability at all these wavelengths, with the variability power concentrated on characteristic time scales of ˜2 hours, and with a variability fraction that increases with wavelength. Interpreted as a dynamical time, the few-hour variability time scale corresponds to a radial distance of 2 AU, or 25 Schwarzchild radii. Searches for quasi-periodicities in the near-infrared data from the Keck Telescope have so far been negative. One implication of the character of these variations is that they most likely result from a recurring disk instability, rather than from variations in the mass accretion rate flowing through the outer boundary of the emission region. Other implications for activity in and near the presumed accretion disk, including processes giving rise to X-ray flares, will be discussed.

Affiliated with

Also associated with

No associations

Rating

Short-term variability of Sgr A* does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Short-term variability of Sgr A*, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Short-term variability of Sgr A* will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1082631