Monitoring a New X-ray Transient 2.5 Arcseconds South of Sgr A*

Details Monitoring a New X-ray Transient 2.5 Arcseconds South of Sgr A* Monitoring a New X-ray Transient 2.5 Arcseconds South of Sgr A*

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1628b&link_type=abstract

Chandra Proposal ID #05628184

Physics

Chandra Proposal Id #05628184

Scientific paper

Chandra observations on 5-6 July reveal a transient 2.5" south (0.1 pc at 8 kpc) of Sgr A*, in an extreme habitat already known to contain two dense star clusters and a 3e6 solar-mass black hole. Its 2-8 keV spectrum (gamma < 0.25) is harder than most INTEGRAL sources. Its luminosity is >2e34 erg/s, with a possible 4 h period, so it is an accreting BH or NS, and may emit much of its flux above 10 keV. Thus, this source may be responsible for much of the emission detected by INTEGRAL and HESS (TeV) during recent observations of Sgr A*. Also, diffuse X-rays only 4 light-months from the source have brightened, suggesting the presence of a jet. We propose to observe the progression of this outburst: (1) to tell us whether it is active during upcoming gamma-ray observations, (2) to determine the mechanism that feeds the source (disk or wind), and (3) to observe the evolution of the jet. This is a singular opportunity to study the interplay between accretion, jets, and gamma-ray emission.

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