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

S. Coude; P. Bastien; H. Kirk; D. Johnstone; E. Drabek-Maunder; S. Graves; J. Hatchell; E. L. Chapin; A. G. Gibb; B. Matthews; D. S. Berry; D. Bresnahan; H. Broekhoven-Fiene; J. Buckle; H. Butner; M. Chen; A. Chrysostomou; M. J. Currie; C.J. Davis; J. Di Francesco; A. Duarte-Cabral; M. Fich; J. Fiege; P. Friberg; R. Friesen; G. A. Fuller; J. Greaves; J. Gregson; M. R. Hogerheijde; W. Holland; T. Jenness; G. Joncas; J. M. Kirk; L. B. G. Knee; S. Mairs; K. Marsh; G. Moriarty-Schieven; J. C. Mottram; C. Mowat; K. Pattle; J. Rawlings; J. Richer; D. Robertson; E. Rosolowsky; D. Rumble; S. Sadavoy; C. Salji; H. Thomas; N. Tothill; S. Viti; D. Ward-Thompson; G. J. White; J. Wouterloot; J. Yates; M. Zhu

doi:10.1093/mnras/stv3009

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

S. Coude, P. Bastien, H. Kirk, D. Johnstone, E. Drabek-Maunder, S. Graves, J. Hatchell, E. L. Chapin, A. G. Gibb, B. Matthews, D. S. Berry, D. Bresnahan, H. Broekhoven-Fiene, J. Buckle, H. Butner, M. Chen, A. Chrysostomou, M. J. Currie, C.J. Davis, J. Di FrancescoA. Duarte-Cabral, M. Fich, J. Fiege, P. Friberg, R. Friesen, G. A. Fuller, J. Greaves, J. Gregson, M. R. Hogerheijde, W. Holland, T. Jenness, G. Joncas, J. M. Kirk, L. B. G. Knee, S. Mairs, K. Marsh, G. Moriarty-Schieven, J. C. Mottram, C. Mowat, K. Pattle, J. Rawlings, J. Richer, D. Robertson, E. Rosolowsky, D. Rumble, S. Sadavoy, C. Salji, H. Thomas, N. Tothill, S. Viti, D. Ward-Thompson, G. J. White, J. Wouterloot, J. Yates, M. Zhu

Western Sydney University

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20 Citations (Scopus)

Abstract

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 Î¼m 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 12CO 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 Î± 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 12CO 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 Î¼m flux densities and how it modifies the deduced spectral index of emissivity Î² for the dust grains. We also show that at least one Spitzer-identified protostellar core in OMC 5 has a 12CO 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.

Original language	English
Pages (from-to)	2139-2150
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	457
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stv3009
Publication status	Published - 2016

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Coude, S., Bastien, P., Kirk, H., Johnstone, D., Drabek-Maunder, E., Graves, S., Hatchell, J., Chapin, E. L., Gibb, A. G., Matthews, B., Berry, D. S., Bresnahan, D., Broekhoven-Fiene, H., Buckle, J., Butner, H., Chen, M., Chrysostomou, A., Currie, M. J., Davis, C. J., ... Zhu, M. (2016). The JCMT Gould Belt Survey : the effect of molecular contamination in SCUBA-2 observations of Orion A. Monthly Notices of the Royal Astronomical Society, 457(2), 2139-2150. https://doi.org/10.1093/mnras/stv3009

@article{cc12bf4158fb421e902d122d0698bd66,

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

abstract = "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 {\^I}¼m 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 12CO 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 {\^I}± 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 12CO 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 {\^I}¼m flux densities and how it modifies the deduced spectral index of emissivity {\^I}² for the dust grains. We also show that at least one Spitzer-identified protostellar core in OMC 5 has a 12CO 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.",

author = "S. Coude and P. Bastien and H. Kirk and D. Johnstone and E. Drabek-Maunder and S. Graves and J. Hatchell and Chapin, {E. L.} and Gibb, {A. G.} and B. Matthews and Berry, {D. S.} and D. Bresnahan and H. Broekhoven-Fiene and J. Buckle and H. Butner and M. Chen and A. Chrysostomou and Currie, {M. J.} and C.J. Davis and {Di Francesco}, J. and A. Duarte-Cabral and M. Fich and J. Fiege and P. Friberg and R. Friesen and Fuller, {G. A.} and J. Greaves and J. Gregson and Hogerheijde, {M. R.} and W. Holland and T. Jenness and G. Joncas and Kirk, {J. M.} and Knee, {L. B. G.} and S. Mairs and K. Marsh and G. Moriarty-Schieven and Mottram, {J. C.} and C. Mowat and K. Pattle and J. Rawlings and J. Richer and D. Robertson and E. Rosolowsky and D. Rumble and S. Sadavoy and C. Salji and H. Thomas and N. Tothill and S. Viti and D. Ward-Thompson and White, {G. J.} and J. Wouterloot and J. Yates and M. Zhu",

year = "2016",

doi = "10.1093/mnras/stv3009",

language = "English",

volume = "457",

pages = "2139--2150",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

Coude, S, Bastien, P, Kirk, H, Johnstone, D, Drabek-Maunder, E, Graves, S, Hatchell, J, Chapin, EL, Gibb, AG, Matthews, B, Berry, DS, Bresnahan, D, Broekhoven-Fiene, H, Buckle, J, Butner, H, Chen, M, Chrysostomou, A, Currie, MJ, Davis, CJ, Di Francesco, J, Duarte-Cabral, A, Fich, M, Fiege, J, Friberg, P, Friesen, R, Fuller, GA, Greaves, J, Gregson, J, Hogerheijde, MR, Holland, W, Jenness, T, Joncas, G, Kirk, JM, Knee, LBG, Mairs, S, Marsh, K, Moriarty-Schieven, G, Mottram, JC, Mowat, C, Pattle, K, Rawlings, J, Richer, J, Robertson, D, Rosolowsky, E, Rumble, D, Sadavoy, S, Salji, C, Thomas, H, Tothill, N, Viti, S, Ward-Thompson, D, White, GJ, Wouterloot, J, Yates, J & Zhu, M 2016, 'The JCMT Gould Belt Survey : the effect of molecular contamination in SCUBA-2 observations of Orion A', Monthly Notices of the Royal Astronomical Society, vol. 457, no. 2, pp. 2139-2150. https://doi.org/10.1093/mnras/stv3009

TY - JOUR

T1 - The JCMT Gould Belt Survey : the effect of molecular contamination in SCUBA-2 observations of Orion A

AU - Coude, S.

AU - Bastien, P.

AU - Kirk, H.

AU - Johnstone, D.

AU - Drabek-Maunder, E.

AU - Graves, S.

AU - Hatchell, J.

AU - Chapin, E. L.

AU - Gibb, A. G.

AU - Matthews, B.

AU - Berry, D. S.

AU - Bresnahan, D.

AU - Broekhoven-Fiene, H.

AU - Buckle, J.

AU - Butner, H.

AU - Chen, M.

AU - Chrysostomou, A.

AU - Currie, M. J.

AU - Davis, C.J.

AU - Di Francesco, J.

AU - Duarte-Cabral, A.

AU - Fich, M.

AU - Fiege, J.

AU - Friberg, P.

AU - Friesen, R.

AU - Fuller, G. A.

AU - Greaves, J.

AU - Gregson, J.

AU - Hogerheijde, M. R.

AU - Holland, W.

AU - Jenness, T.

AU - Joncas, G.

AU - Kirk, J. M.

AU - Knee, L. B. G.

AU - Mairs, S.

AU - Marsh, K.

AU - Moriarty-Schieven, G.

AU - Mottram, J. C.

AU - Mowat, C.

AU - Pattle, K.

AU - Rawlings, J.

AU - Richer, J.

AU - Robertson, D.

AU - Rosolowsky, E.

AU - Rumble, D.

AU - Sadavoy, S.

AU - Salji, C.

AU - Thomas, H.

AU - Tothill, N.

AU - Viti, S.

AU - Ward-Thompson, D.

AU - White, G. J.

AU - Wouterloot, J.

AU - Yates, J.

AU - Zhu, M.

PY - 2016

Y1 - 2016

N2 - 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 Î¼m 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 12CO 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 Î± 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 12CO 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 Î¼m flux densities and how it modifies the deduced spectral index of emissivity Î² for the dust grains. We also show that at least one Spitzer-identified protostellar core in OMC 5 has a 12CO 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.

AB - 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 Î¼m 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 12CO 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 Î± 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 12CO 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 Î¼m flux densities and how it modifies the deduced spectral index of emissivity Î² for the dust grains. We also show that at least one Spitzer-identified protostellar core in OMC 5 has a 12CO 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.

UR - https://hdl.handle.net/1959.7/uws:64128

U2 - 10.1093/mnras/stv3009

DO - 10.1093/mnras/stv3009

M3 - Article

SN - 0035-8711

VL - 457

SP - 2139

EP - 2150

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

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

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