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P.J. Castro, M. Gagne (West Chester University), N.F. Tothill (CfA), M.A. Kenworthy (Steward Observatory), M.J McCaughrean (Ast. Inst. Potsdam)
We present a pair of deep X-ray images of the Lagoon Nebula and the NGC 6530 star-forming region obtained with the Chandra X-ray Observatory. The ACIS images reveal 1542 X-ray sources in the combined field of view, most of these likely associated with classical and weak-line T-Tauri stars. Approximately 1200 X-ray sources have 2MASS JHK-band counterparts. The Chandra data reveal three populations of stars: (1) a large population of relatively soft X-ray sources associated with the 2-Myr old cluster NGC 6530, (2) a population of hard, variable X-ray sources to the south first discussed by Damiani et al. (2004) and probably associated with low-mass YSO's, and (3) a compact cluster of ~80 hard X-ray sources within 1' of the very young O star Herschel 36. The soft X-ray emission from Her 36 (O7 V), the ionizing source of the Hourglass Nebula, is typical of many O stars. The two hard X-ray source populations are spatially coincident with ridges of enhanced far-infrared emission seen in 850-micron SCUBA maps of the Lagoon Nebula region. This research is supported through NASA/SAO grant GO3-4014.
The author(s) of this abstract have provided an email address for comments about the abstract: mgagne@wcupa.edu
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Bulletin of the American Astronomical Society, 36 #2
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