Mon. Not. R. Astron. Soc., 437, 1561-1575 (2014/January-2)
The role of low-mass star clusters in forming the massive stars in DR 21.
RIVILLA V.M., JIMENEZ-SERRA I., MARTIN-PINTADO J. and SANZ-FORCADA J.
Abstract (from CDS):
We have studied the young low-mass pre-main sequence (PMS) stellar population associated with the massive star-forming region DR 21 by using archival X-ray Chandra observations and by complementing them with existing optical and infrared (IR) surveys. The Chandra observations have revealed for the first time a new highly extincted population of PMS low-mass stars previously missed in observations at other wavelengths. The X-ray population exhibits three main stellar density peaks, coincident with the massive star-forming regions, being the DR 21 core the main peak. The cross-correlated X-ray/IR sample exhibits a radial `Spokes-like' stellar filamentary structure that extends from the DR 21 core towards the northeast. The near-IR data reveal a centrally peaked structure for the extinction, which exhibits its maximum in the DR 21 core and gradually decreases with the distance to the N-S cloud axis and to the cluster centre. We find evidence of a global mass segregation in the full low-mass stellar cluster, and of a stellar age segregation, with the youngest stars still embedded in the N-S cloud, and more evolved stars more spatially distributed. The results are consistent with the scenario where an elongated overall potential well created by the full low-mass stellar cluster funnels gas through filaments feeding stellar formation. Besides the full gravitational well, smaller scale local potential wells created by dense stellar sub-clusters of low-mass stars are privileged in the competition for the gas of the common reservoir, allowing the formation of massive stars. We also discuss the possibility that a stellar collision in the very dense stellar cluster revealed by Chandra in the DR 21 core is the origin of the large-scale and highly energetic outflow arising from this region.
© 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
stars: formation - stars: low-mass - stars: massive - stars: pre-main-sequence - galaxies: star clusters: general - X-rays: stars
VizieR on-line data:
<Available at CDS (J/MNRAS/437/1561): table2.dat>
Table 2: [RJM2014] NNN (Nos 1-281).
The star DR 21-D is not in Simbad (no coordinates).
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