Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4802w&link_type=abstract
American Astronomical Society Meeting 208, #48.02; Bulletin of the American Astronomical Society, Vol. 38, p.123
Other
Scientific paper
We present an 100 ks Chandra observation of the Arches and Quintuplet star clusters. The sources associated with the Arches cluster are luminous and show remarkably similar thermal spectra, most likely representing extreme colliding wind massive star binaries, perhaps formed dynamically in the dense core of the cluster. The ``diffuse'' X-ray emission from the Arches core has a spectrum with a distinct 6.7-keV line and a steep surface brightness decline with the radius, indicating an origin in a cluster wind. In outer regions, diffuse X-ray enhancement demonstrates a bow shock morphology and is prominent in the Fe Kalpha 6.4-keV line emission, which may result from an ongoing collision between the cluster and a CS molecular cloud at a relative velocity greater than 120 km/s. In contrast, the older and less compact Quintuplet cluster contains only much weaker X-ray sources and diffuse emission of a nearly featureless spectrum. Nevertheless, the predicted cluster wind contribution accounts for only a small fraction of the observed diffuse emission. The bulk of this emission may arise in low-mass young pre-main-sequence stellar objects.But the overall population of such objects, constrained by the observed total diffuse X-ray luminosities, is substantially smaller than what is expected of the two clusters, if they have a normal initial mass function. This deficiency of low-mass objects may result from the early removal of the cluster natal clouds due to high-velocity collisions with other dense clouds, which are ubiquitously present in the Galactic center.
Dong Hui
Wang Daniel Q.
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