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ATLASGAL - environments of 6.7 GHz methanol masers

Urquhart, JS, Moore, TJT, Schuller, F, Wyrowski, F, Menten, KM, Thompson, MA, Csengeri, T, Walmsley, CM, Bronfman, L and Koenig, C (2013) ATLASGAL - environments of 6.7 GHz methanol masers. Monthly Notices of the Royal Astronomical Society, 431 (2). pp. 1752-1776. ISSN 0035-8711

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Abstract

Using the 870 μm APEX Telescope large area survey of the Galaxy, we have identified 577 submillimetre continuum sources with masers from the methanol multibeam survey in the region 280° < ℓ < 20°; |b| < 1°.5. 94 per cent of methanol masers in the region are associated with submillimetre dust emission. We estimate masses for ∼450 maser-associated sources and find that methanol masers are preferentially associated with massive clumps. These clumps are centrally condensed, with envelope structures that appear to be scale-free, the mean maser position being offset from the peak column density by 0 ± 4 arcsec. Assuming a Kroupa initial mass function and a star formation efficiency of ∼30 per cent, we find that over two-thirds of the clumps are likely to form clusters with masses >20 M. Furthermore, almost all clumps satisfy the empirical mass-size criterion for massive star formation. Bolometric luminosities taken from the literature for ∼100 clumps range between ∼100 and 10 L. This confirms the link between methanol masers and massive young stars for 90 per cent of our sample. The Galactic distribution of sources suggests that the star formation efficiency is significantly reduced in the Galactic Centre region, compared to the rest of the survey area, where it is broadly constant, and shows a significant drop in the massive star formation rate density in the outer Galaxy. We find no enhancement in source counts towards the southern Scutum-Centaurus arm tangent at ℓ ∼ 315°, which suggests that this arm is not actively forming stars. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Auhtors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 09 Mar 2018 09:22
Last Modified: 09 Mar 2018 09:22
DOI or Identification number: 10.1093/mnras/stt287
URI: http://researchonline.ljmu.ac.uk/id/eprint/8233

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