The JCMT Gould Belt Survey: the effect of molecular contamination in SCUBA-2 observations of Orion A

被引：20

作者：

Coude, S. ^{[1
,2
]}

Bastien, P. ^{[1
,2
]}

Kirk, H. ^{[3
]}

Johnstone, D. ^{[3
,4
]}

Drabek-Maunder, E. ^{[6
]}

Graves, S. ^{[7
,8
,9
]}

Hatchell, J. ^{[10
]}

Chapin, E. L. ^{[5
]}

Gibb, A. G. ^{[11
]}

Matthews, B. ^{[3
,5
]}

机构：

[1] Univ Montreal, Ctr Rech Astrophys Quebec, CP 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada

[2] Univ Montreal, Dept Phys, CP 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada

[3] NRC Herzberg Astron & Astrophys, 5071 W Saanich Rd, Victoria, BC V9E 2E7, Canada

[4] Joint Astron Ctr, 660 N Aohoku Pl, Hilo, HI 96720 USA

[5] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada

[6] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Prince Consort Rd, London SW7 2BB, England

[7] Univ Cambridge, Cavendish Lab, Astrophys Grp, JJ Thomson Ave, Cambridge CB3 0HE, England

[8] Univ Cambridge, Inst Astron, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England

[9] East Asian Observ, 660 N Aohoku Pl, Hilo, HI 96720 USA

[10] Univ Exeter, Phys & Astron, Stocker Rd, Exeter EX4 4QL, Devon, England

[11] Univ British Columbia, Dept Phys & Astron, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 457卷 / 02期

关键词：

instrumentation: detectors; stars: formation; stars: protostars; ISM: molecules; submillimetre: ISM; 850; MU-M; SPECTRAL INDEX; LEGACY SURVEY; SUBMILLIMETER; CLOUD; FILAMENT; HERSCHEL; DISTRIBUTIONS; PERSEUS; OBJECTS;

D O I：

10.1093/mnras/stv3009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Thermal emission from cold dust grains in giant molecular clouds can be used to probe the physical properties, such as density, temperature and emissivity in star-forming regions. We present the Submillimetre Common-User Bolometer Array (SCUBA-2) shared-risk observations at 450 and 850 mu m of the Orion A molecular cloud complex taken at the James Clerk Maxwell Telescope (JCMT). Previous studies showed that molecular emission lines can contribute significantly to the measured fluxes in those continuum bands. We use the Heterodyne Array Receiver Programme (CO)-C-12 J = 3-2 integrated intensity map for Orion A in order to evaluate the molecular line contamination and its effects on the SCUBA-2 maps. With the corrected fluxes, we have obtained a new spectral index alpha map for the thermal emission of dust in the well-known integral-shaped filament. Furthermore, we compare a sample of 33 sources, selected over the Orion A molecular cloud complex for their high (CO)-C-12 J = 3-2 line contamination, to 27 previously identified clumps in OMC 4. This allows us to quantify the effect of line contamination on the ratio of 850-450 mu m flux densities and how it modifies the deduced spectral index of emissivity beta for the dust grains. We also show that at least one Spitzer-identified protostellar core in OMC 5 has a (CO)-C-12 J = 3-2 contamination level of 16 per cent. Furthermore, we find the strongest contamination level (44 per cent) towards a young star with disc near OMC 2. This work is part of the JCMT Gould Belt Legacy Survey.

引用

页码：2139 / 2150

页数：12

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