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A distance-limited sample of massive molecular outflows

Maud, L.T., Moore, T.J.T., Lumsden, S.L., Mottram, J.C., Urquhart, J.S., Hoare, M.G. (2015) A distance-limited sample of massive molecular outflows. Monthly Notices of the Royal Astronomical Society, 453 (1). pp. 645-665. ISSN 0035-8711. (doi:10.1093/mnras/stv1635) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:52185)

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We have observed 99 mid-infrared-bright, massive young stellar objects and compact H?ii regions drawn from the Red MSX source survey in the J = 3?2 transition of 12CO and 13CO, using the James Clerk Maxwell Telescope. 89 targets are within 6?kpc of the Sun, covering a representative range of luminosities and core masses. These constitute a relatively unbiased sample of bipolar molecular outflows associated with massive star formation. Of these, 59, 17 and 13 sources (66, 19 and 15?per?cent) are found to have outflows, show some evidence of outflow, and have no evidence of outflow, respectively. The time-dependent parameters of the high-velocity molecular flows are calculated using a spatially variable dynamic time-scale. The canonical correlations between the outflow parameters and source luminosity are recovered and shown to scale with those of low-mass sources. For coeval star formation, we find the scaling is consistent with all the protostars in an embedded cluster providing the outflow force, with massive stars up to ?30?M? generating outflows. Taken at face value, the results support the model of a scaled-up version of the accretion-related outflow-generation mechanism associated with discs and jets in low-mass objects with time-averaged accretion rates of ?10?3?M??yr?1 on to the cores. However, we also suggest an alternative model, in which the molecular outflow dynamics are dominated by the entrained mass and are unrelated to the details of the acceleration mechanism. We find no evidence that outflows contribute significantly to the turbulent kinetic energy of the surrounding dense cores.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stv1635
Uncontrolled keywords: Stars: abundances, Stars: formation, Stars: massive, Stars: protostars, Stars: winds, outflows
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: James Urquhart
Date Deposited: 24 Nov 2015 11:54 UTC
Last Modified: 17 Aug 2022 10:59 UTC
Resource URI: (The current URI for this page, for reference purposes)
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