Mairs, S;
Johnstone, D;
Kirk, H;
Buckle, J;
Berry, DS;
Broekhoven-Fiene, H;
Currie, MJ;
... Zhu, M; + view all
(2016)
The JCMT Gould Belt Survey: a first look at Southern Orion A with SCUBA-2.
Monthly Notices of the Royal Astronomical Society
, 461
(4)
pp. 4022-4048.
10.1093/mnras/stw1550.
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Abstract
We present the JCMT Gould Belt Survey's first look results of the southern extent of the Orion A Molecular Cloud (δ ≤ −5:31:27.5). Employing a two-step structure identification process, we construct individual catalogues for large-scale regions of significant emission labelled as islands and smaller-scale subregions called fragments using the 850 μm continuum maps obtained using SCUBA-2. We calculate object masses, sizes, column densities, and concentrations. We discuss fragmentation in terms of a Jeans instability analysis and highlight interesting structures as candidates for follow-up studies. Furthermore, we associate the detected emission with young stellar objects (YSOs) identified by Spitzer and Herschel. We find that although the population of active star-forming regions contains a wide variety of sizes and morphologies, there is a strong positive correlation between the concentration of an emission region and its calculated Jeans instability. There are, however, a number of highly unstable subregions in dense areas of the map that show no evidence of star formation. We find that only ∼72 per cent of the YSOs defined as Class 0+I and flat-spectrum protostars coincide with dense 850 μm emission structures (column densities >3.7 × 1021 cm−2). The remaining 28 per cent of these objects, which are expected to be embedded in dust and gas, may be misclassified. Finally, we suggest that there is an evolution in the velocity dispersion of YSOs such that sources which are more evolved are associated with higher velocities.
Type: | Article |
---|---|
Title: | The JCMT Gould Belt Survey: a first look at Southern Orion A with SCUBA-2 |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1093/mnras/stw1550 |
Publisher version: | http://doi.org/10.1093/mnras/stw1550 |
Language: | English |
Additional information: | © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, stars: formation, stars: protostars, ISM: structure, submillimetre: general, submillimetre: ISM, YOUNG STELLAR OBJECTS, CLERK MAXWELL TELESCOPE, PERSEUS MOLECULAR CLOUD, CURRENT STAR-FORMATION, SMALL-SCALE STRUCTURES, MAIN-SEQUENCE STARS, CORE MASS FUNCTION, 850 MU-M, UNBIASED SUBMILLIMETER, CLUMP IDENTIFICATION |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
URI: | https://discovery.ucl.ac.uk/id/eprint/1524418 |
1. | United States | 3 |
2. | United Kingdom | 1 |
3. | Russian Federation | 1 |
4. | Taiwan | 1 |
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