Department of Astronomy and the Steward Observatory
The University of Arizona
The University of Arizona in Tucson Arizona
Navigation Bar
UA Home Maps Main Page Telescopes Major Projects Calendar Colloquia Employee Directory
Navigation Dept. Overview Academic Program Undergraduate Graduate Program How to Apply Research Classes Symposia Telescopes Laboratories Space Projects Faculty Staff Resources Outreach Newsletter Early History Weblinks Job Openings Home Safety Telescopes Major Projects Calendar Colloquia Employee Directory Telescopes Major Projects Calendar Colloquia Employee Directory
Event: Chandra Observations of Sgr A* and Its Galactic Habitat
Event Date/Time: December 9, 2004 4:00 pm
Location:Steward Observatory N210
Speaker:Fred Baganoff
Institution:MIT
Subject(s): Steward/NOAO Colloquium 
Contact:Jill Bechtold    email: jbechtold@as.arizoan.edu  
  To add an update or review to this event click this:
Event Description

Posted:
August 19, 2004 3:46 pm

Over the past five years, the Chandra X-ray Observatory has repeatedly observed Sgr A, the compact radio source and supermassive black hole at the dynamical center of the Milky Way. The deep exposure coupled with Chandra's 0.5 arcsecond resolution have produced the most sensitive X-ray image of our Galactic center, allowing us to study the central black hole and its environment in unprecedented detail. Sgr A is extremely faint in X-rays, radiating about 11 orders of magnitude below the Eddington limit. The properties of this emission will be discussed, along with the emission from surrounding stars and structures in the central parsecs of the Galaxy. In October 2000,Chandra discovered a rapid, large-amplitude X-ray flare from Sgr A. This extreme activity was totally unexpected. Chandra and XMM-Newton have since shown that Sgr A flares in X-rays on a daily basis. NIR flares have been discovered within the last year at about three times the rate of the X-ray flares, raising the question of whether the X-ray and NIR flares are produced by the same or different processes. I will present results from the first simultaneous detection of an X-ray and NIR flare from Sgr A*. At least in this case, the X-rays and NIR photons appear to arise from the same electron population.



All contents copyright © 2007. Arizona Board of Regents.