Davis, C.J. and Kumar, M.S.N. and Sandell, G. and Froebrich, D. and Smith, M.D. and Currie, M.J. (2007) WFCAM, Spitzer/IRAC and SCUBA observations of the massive star-forming region DR21/W75 - I. The collimated molecular jets. Monthly Notices of the Royal Astronomical Society, 374 (1). pp. 29-53. ISSN 0035-8711.
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We present wide-field near-infrared (IR) images of the DR21/W75 high-mass star-forming region, obtained with the Wide Field Camera (WFCAM) on the United Kingdom Infrared Telescope. Broad-band JHK and narrow-band H-2 1-0S(1) images are compared to archival mid-IR images from the Spitzer Space Telescope, and 850-mu m dust-continuum maps obtained with the Submillimeter Common User Bolometer Array (SCUBA). Together these data give a complete picture of dynamic star formation across this extensive region, which includes at least four separate star-forming sites in various stages of evolution. The H-2 data reveal knots and bow shocks associated with more than 50 individual flows. Most are well collimated, and at least five qualify as parsec-scale flows. Most appear to be driven by embedded, low-mass protostars. The orientations of the outflows, particularly from the few higher mass sources in the region (DR21, DR21(OH), W75N and ERO 1), show some degree of order, being preferentially orientated roughly orthogonal to the chain of dusty cores that runs north-south through DR21. Clustering may inhibit disc accretion and therefore the production of outflows; we certainly do not see enhanced outflow activity from clusters of protostars. Finally, although the low-mass protostellar outflows are abundant and widely distributed, the current generation does not provide sufficient momentum and kinetic energy to account for the observed turbulent motions in the DR21/W75 giant molecular clouds. Rather, multiple epochs of outflow activity are required over the million-year time-scale for turbulent decay.
|Uncontrolled keywords:||circumstellar matter; stars : formation; ISM : individual : DR21; ISM : individual : DR21(OH); ISM : individual : W75; ISM : jets and outflows; ISM : kinematics and dynamics; infrared : stars|
|Subjects:||Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QC Physics
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Faculties > Science Technology and Medical Studies > School of Physical Sciences
|Depositing User:||Louise Dorman|
|Date Deposited:||19 Mar 2008 08:39|
|Last Modified:||14 Jan 2010 14:06|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/2312 (The current URI for this page, for reference purposes)|
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