Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-03
Astronomy and Astrophysics
Astrophysics
Submitted to ApJ Letters. 5 pages, 2 figures (1 color). Uses emulateapj
Scientific paper
10.1086/375550
We have discovered extended X-ray emission from the microquasar Cyg X-3 in archival Chandra X-ray Observatory observations. A 5" wide structure lies approximately 16" to the NE from the core point source and may be extended in that direction. This angular scale corresponds to a physical extent of roughly 0.8 lyr, at a distance of 2.5 lyr from Cyg X-3 (assuming a 10 kpc distance). The flux varied by a factor of 2.5 during the four months separating two of the observations, indicating significant substructure. The peak 2-10 keV luminosity was about 5e34 ergs/s. There may also be weaker, extended emission of similar scale oppositely directed from the core, suggesting a bipolar outflow. This structure is not part of the dust scattering halo, nor is it caused by the Chandra point spread function. In this Letter we describe the observations and discuss possible origins of the extension.
Heindl William A.
Smith Masson D.
Tomsick John A.
Wijnands Rudy
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