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The JCMT Gould Belt Survey: a first look at dense cores in Orion B

Kirk, H., Francesco, J. Di, Johnstone, D., Duarte-Cabral, Ana, Sadavoy, S., Hatchell, J., Mottram, J. C., Buckle, J., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Jenness, T., Nutter, David John, Pattle, K., Pineda, J. E., Quinn, Ciara, Salji, C., Tisi, S., Hogerheijde, M. R., Ward-Thompson, D., Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coude, S., Davis, C. J., Drabek-Maunder, Emily, Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Graves, S., Greaves, Jane, Gregson, J., Holland, W., Joncas, G., Kirk, J. M., Knee, L. B. G., Mairs, S., Marsh, Kenneth, Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J. and Zhu, M. 2016. The JCMT Gould Belt Survey: a first look at dense cores in Orion B. Astrophysical Journal 817 (2) , pp. 1-23. 10.3847/0004-637X/817/2/167

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Abstract

We present a first look at the SCUBA-2 observations of three sub-regions of the Orion B molecular cloud: LDN 1622, NGC 2023/2024, and NGC 2068/2071, from the JCMT Gould Belt Legacy Survey. We identify 29, 564, and 322 dense cores in L1622, NGC 2023/2024, and NGC 2068/2071 respectively, using the SCUBA-2 850 μm map, and present their basic properties, including their peak fluxes, total fluxes, and sizes, and an estimate of the corresponding 450 μm peak fluxes and total fluxes, using the FellWalker source extraction algorithm. Assuming a constant temperature of 20 K, the starless dense cores have a mass function similar to that found in previous dense core analyses, with a Salpeter-like slope at the high-mass end. The majority of cores appear stable to gravitational collapse when considering only thermal pressure; indeed, most of the cores which have masses above the thermal Jeans mass are already associated with at least one protostar. At higher cloud column densities, above 1–2 × 1023 cm−2, most of the mass is found within dense cores, while at lower cloud column densities, below 1 × 1023 cm−2, this fraction drops to 10% or lower. Overall, the fraction of dense cores associated with a protostar is quite small (<8%), but becomes larger for the densest and most centrally concentrated cores. NGC 2023/2024 and NGC 2068/2071 appear to be on the path to forming a significant number of stars in the future, while L1622 has little additional mass in dense cores to form many new stars.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: American Astronomical Society
ISSN: 1538-4357
Date of First Compliant Deposit: 10 October 2017
Date of Acceptance: 9 November 2015
Last Modified: 28 Jun 2019 04:05
URI: http://orca.cf.ac.uk/id/eprint/87925

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