Infall and outflow motions towards a sample of massive star-forming regions from the RMS survey

Cunningham, N, Lumsden, SL, Moore, TJT, Maud, LT and Mendigutia, I (2018) Infall and outflow motions towards a sample of massive star-forming regions from the RMS survey. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 477 (2). pp. 2442-2456.

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Official URL: http://dx.doi.org/10.1093/mnras/sty701

Abstract

We present the results of an outflow and infall survey towards a distance-limited sample of 31 massive star-forming regions drawn from the Red MSX source (RMS) survey. The presence of young, active outflows is identified from SiO (8-7) emission and the infall dynamics are explored using HCO+/H13CO+ (4-3) emission. We investigate if the infall and outflow parameters vary with source properties, exploring whether regions hosting potentially young active outflows show similarities or differences with regions harbouring more evolved, possibly momentum-driven, 'fossil' outflows. SiO emission is detected towards approximately 46 per cent of the sources. When considering sources with and without an SiO detection (i.e. potentially active and fossil outflows, respectively), only the 12CO outflow velocity shows a significant difference between samples, indicating SiO is more prevalent towards sources with higher outflow velocities. Furthermore, we find the SiO luminosity increases as a function of the Herschel 70 μm to WISE 22 μm flux ratio, suggesting the production of SiO is prevalent in younger, more embedded regions. Similarly, we find tentative evidence that sources with an SiO detection have a smaller bolometric luminosity-to-mass ratio, indicating SiO (8-7) emission is associated with potentially younger regions. We do not find a prevalence towards sources displaying signatures of infall in our sample. However, the higher energy HCO+ transitions may not be the best suited tracer of infall at this spatial resolution in these regions.

Item Type:	Article
Uncontrolled Keywords:	stars: formation, ISM: jets and outflows, ISM: molecules
Depositing User:	Symplectic Admin
Date Deposited:	28 Nov 2018 09:37
Last Modified:	19 Jan 2023 01:33
DOI:	10.1093/mnras/sty701
Open Access URL:	https://arxiv.org/pdf/1803.03501.pdf
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3022000