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ATLASGAL - environments of 6.7 GHz methanol masers

Urquhart, J.S., Moore, T.J.T., Schuller, F., Wyrowski, F., Menten, K.M., Thompson, M.A., Csengeri, T., Walmsley, C.M., Bronfman, L., König, C. and others. (2013) ATLASGAL - environments of 6.7 GHz methanol masers. Monthly Notices of the Royal Astronomical Society, 431 (2). pp. 1752-1776. ISSN 0035-8711. (doi:10.1093/mnras/stt287) (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:52198)

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Using the 870 ?m 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° < ? < 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 106 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 ? ? 315°, which suggests that this arm is not actively forming stars.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stt287
Uncontrolled keywords: Early-type, Stars, Formation, ISM, Molecules, galaxy, Structure
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 12:21 UTC
Last Modified: 16 Nov 2021 10:21 UTC
Resource URI: (The current URI for this page, for reference purposes)
Urquhart, J.S.:
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