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Beyond the Solar Circle − Trends in Massive Star Formation Between the Inner and Outer Galaxy

Djordjevic, J.O., Thompson, M.A., Urquhart, J.S., Forbrich, J. (2019) Beyond the Solar Circle − Trends in Massive Star Formation Between the Inner and Outer Galaxy. Monthly Notices of the Royal Astronomical Society, . ISSN 0035-8711. (doi:10.1093/mnras/stz1262)

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Official URL
https://doi.org/10.1093/mnras/stz1262

Abstract

We have compiled the most complete compact and ultracompact H II region catalogue to date via multi-wavelength inspection of survey data. We utilise data from the recently available SASSy 850 µm survey to identify massive star forming clumps in the outer Galaxy (RGC > 8.5 kpc) and cross-match with infrared and radio data of known UC H II regions from the RMS database. For the inner Galaxy sample (RGC < 8.5 kpc), we adopt the compact H II regions from previous works that used similar methods to cross match ATLASGAL with either CORNISH or RMS, depending on the location within the Galactic plane. We present a new UC H II region catalogue that more than doubles the original sample size of previous work, totalling 536 embedded H II regions and 445 host clumps. We examine the distance independent values of NLy/M and Lbol/M as proxies for massive star formation efficiency and overall star formation efficiency, respectively. We find a significant trend showing that Lbol/M decreases with increasing RGC, suggesting that the overall star formation per unit mass is less in the outer Galaxy.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stz1262
Uncontrolled keywords: catalogues – surveys – ISM: HII regions – submillimetre: ISM – radio continuum: ISM – stars: formation
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 10 May 2019 12:29 UTC
Last Modified: 08 Jul 2019 09:12 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/73853 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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