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The JCMT Gould Belt Survey: evidence for radiative heating and contamination in the W40 complex

Rumble, D., Hatchell, J., Pattle, K., Kirk, H., Wilson, T., Buckle, J., Berry, D.S., Broekhoven-Fiene, H., Currie, M.J., Fich, M., Jenness, T., Johnstone, D., Mottram, J. C., Nutter, D., Pineda, J.E., Quinn, C., Salji, C., Tisi, S., Walker-Smith, S., Francesco, J. Di, Hogerheijde, M.R., Ward-Thompson, D., Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coude, S., Davis, C.J., Drabek-Maunder, Emily ORCID:, Duarte Cabral, Ana ORCID:, Fiege, J., Friberg, P., Friesen, R., Fuller, G.A., Graves, S., Greaves, Jane ORCID:, Gregson, J., Holland, W., Joncas, G., Kirk, J. M., Knee, L. B. G., Mairs, S., Marsh, Kenneth ORCID:, Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Sadavoy, S., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J. and Zhu, M. 2016. The JCMT Gould Belt Survey: evidence for radiative heating and contamination in the W40 complex. Monthly Notices of the Royal Astronomical Society 460 (4) , pp. 4150-4175. 10.1093/mnras/stw1100

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We present SCUBA-2 450 μm and 850 μm observations of the W40 complex in the Serpens-Aquila region as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) of nearby star-forming regions. We investigate radiative heating by constructing temperature maps from the ratio of SCUBA-2 fluxes using a fixed dust opacity spectral index, β = 1.8, and a beam convolution kernel to achieve a common 14.8 arcsec resolution.We identify 82 clumps ranging between 10 and 36 K with a mean temperature of 20 ± 3 K. Clump temperature is strongly correlated with proximity to the external OB association and there is no evidence that the embedded protostars significantly heat the dust.We identify 31 clumps that have cores with densities greater than 105cm−3. 13 of these cores contain embedded Class 0/I protostars. Many cores are associated with bright-rimmed clouds seen in Herschel 70 μm images. From JCMT HARP observations of the 12CO 3–2 line, we find contamination of the 850 μm band of up to 20 per cent. We investigate the free–free contribution to SCUBA-2 bands from large-scale and ultracompact HII regions using archival VLA data and find the contribution is limited to individual stars, accounting for 9 per cent of flux per beam at 450 μm or 12 per cent at 850 μm in these cases. We conclude that radiative heating has potentially influenced the formation of stars in the Dust Arc sub-region, favouring Jeans stable clouds in the warm east and fragmentation in the cool west.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 7 July 2017
Date of Acceptance: 6 May 2016
Last Modified: 03 May 2023 16:30

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