Astrophys. J., 696, 47-65 (2009/May-1)
A Chandra study of the Rosette star-forming complex. II. Clusters in the Rosette Molecular Cloud.
WANG J., FEIGELSON E.D., TOWNSLEY L.K., ROMAN-ZUNIGA C.G., LADA E. and GARMIRE G.
Abstract (from CDS):
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. A 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 high-mass 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 subregions 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.
ISM: clouds - ISM: individual: Rosette Nebula - stars: formation - stars: pre-main sequence - X-rays: stars
VizieR on-line data:
<Available at CDS (J/ApJ/696/47): table1.dat table2.dat table3.dat table4.dat table5.dat>
Tables 1-4: [WFT2009] RMCX NNN (Nos 1-395). Table 4, col(8): [WFT2009] FLAMINGOS JHHMMSS+DDMMSS N=292. Table 5: [WFT2009] XA (Nos A-C), [WFT2009] XAN N=8.
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