A chandra study of the rosette star-forming complex. II. clusters in the rosette molecular cloud

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Abstract

We explore here the young stellar populations in the Rosette Molecular Cloud (RMC) region with high spatial resolution X-ray images from the Chandra X-ray Observatory, which are effective in locating weak-lined T Tauri stars as well as disk-bearing young stars. Á total of 395 X-ray point sources are detected, 299 of which (76%) have an optical or near-infrared (NIR) counterpart identified from deep FLAMINGOS images. From X-ray and mass sensitivity limits, we infer a total population of ∼1700 young stars in the survey region. Based on smoothed stellar surface density maps, we investigate the spatial distribution of the X-ray sources and define three distinctive structures and substructures within them. Structures B and C are associated with previously known, embedded IR clusters, while structure A is a new X-ray-identified unobscured cluster. A highmass protostar RMCX #89 = IRAS 06306+0437 and its associated sparse cluster are studied. The different subregions are not coeval but do not show a simple spatial-age pattern. Disk fractions vary between subrogions and are generally ≲20% of the total stellar population inferred from the X-ray survey. The data are consistent with speculations that triggered star formation around the H II region is present in the RMC, but do not support a simple sequential triggering process through the cloud interior. While a significant fraction of young stars are located in a distributed population throughout the RMC region, it is not clear if they originated in clustered environments. © 2009. The American Astronomical Society. All rights reserved. Printed in the U.S.A.

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Wang, J., Feigelson, E. D., Townsley, L. K., Román-Zúñiga, C. G., Lada, E., & Garmire, G. (2009). A chandra study of the rosette star-forming complex. II. clusters in the rosette molecular cloud. Astrophysical Journal, 696(1), 47–65. https://doi.org/10.1088/0004-637X/696/1/47

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