Astrophys. J., 573, 191-198 (2002/July-1)
Galactic starburst NGC 3603 from x-rays to radio.
MOFFAT A.F.J., CORCORAN M.F., STEVENS I.R., SKALKOWSKI G., MARCHENKO S.V., MUCKE A., PTAK A., KORIBALSKI B.S., BRENNEMAN L., MUSHOTZKY R., PITTARD J.M., POLLOCK A.M.T. and BRANDNER W.
Abstract (from CDS):
NGC 3603 is the most massive and luminous visible starburst region in the Galaxy. We present the first Chandra ACIS-I X-ray image and spectra of this dense, exotic object, accompanied by a deep centimeter-wavelength Australia Telescope Compact Array radio image at similar ≲1" spatial resolution and Hubble Space Telescope/ground-based optical data. At the S/N>3 level, Chandra detects several hundred X-ray point sources (compared to the three distinct sources seen by ROSAT). At least 40 of these sources are definitely associated with optically identified cluster O- and W-R-type members, but most are not. A diffuse X-ray component is also seen out to ∼2' (4 pc) from the center, probably arising mainly from the large number of merging/colliding hot stellar winds and/or numerous faint cluster sources. The point-source X-ray fluxes generally increase with increasing bolometric brightnesses of the member O/W-R stars, but with very large scatter. Some exceptionally bright stellar X-ray sources may be colliding wind binaries. The radio image shows (1) two resolved sources, one definitely nonthermal, in the cluster core near where the X-ray/optically brightest stars with the strongest stellar winds are located, (2) emission from all three known proplyd-like objects (with thermal and nonthermal components), and (3) many thermal sources in the peripheral regions of triggered star formation. Overall, NGC 3603 appears to be a somewhat younger and hotter scaled-down version of typical starbursts found in other galaxies.
Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 3603 - Stars: Early-Type - Stars: Winds, Outflows
Fig.2: Cl* NGC 3603 MDS NNa (No. 7b) added.
Fig.1: P1, P2, P3 = [BGC2000] Proplyd 1, 2, 3.
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