Herschel-SPIRE spectroscopy of the DR21 molecular cloud core [Letter]

White, G. J., Abergel, A., Spencer, L., Schneider, N., Naylor, D. A., Anderson, L. D., Joblin, C., Ade, Peter A. R. ORCID: https://orcid.org/0000-0002-5127-0401, André, P., Arab, H., Baluteau, J.-P., Bernard, J.-P., Blagrave, K., Bontemps, S., Boulanger, F., Cohen, M., Compiegne, M., Cox, P., Dartois, E., Davis, G., Emery, R., Fulton, T., Gom, B., Griffin, Matthew Joseph ORCID: https://orcid.org/0000-0002-0033-177X, Gry, C., Habart, E., Huang, M., Jones, S., Kirk, Jason M., Lagache, G., Leeks, S., Lim, T., Madden, S., Makiwa, G., Martin, P., Miville-Deschênes, M.-A., Molinari, S., Moseley, H., Motte, F., Okumura, K., Pinheiro Gonçalves, D., Polehampton, E., Rodet, T., Rodón, J. A., Russeil, D., Saraceno, P., Sidher, S., Swinyard, B. M., Ward-Thompson, Derek ORCID: https://orcid.org/0000-0003-1140-2761 and Zavagno, A. 2010. Herschel-SPIRE spectroscopy of the DR21 molecular cloud core [Letter]. Astronomy & Astrophysics 518 , L114. 10.1051/0004-6361/201014622

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Abstract

We present far-infrared spectra and maps of the DR21 molecular cloud core between 196 and 671 μm, using the Herschel-SPIRE spectrometer. Nineteen molecular lines originating from CO, 13CO, HCO+ and H2O, plus lines of [N ii] and [CI] were recorded, including several transitions not previously detected. The CO lines are excited in warm gas with Tkin ∼ 125 K and nH2 ∼ 7×104 cm−3, CO column density N(CO) ∼ 3.5×1018 cm−2 and a filling factor of ∼12%, and appear to trace gas associated with an outflow. The rotational temperature analysis incorporating observations from ground-based telescopes reveals an additional lower excitation CO compoment which has a temperature ∼78 K and N(CO) ∼ 4.5×1021 cm−2.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Uncontrolled Keywords:	ISM ; lines and bands – infrared ; ISM – ISM ; molecules.
Additional Information:	5 pp.
Publisher:	EDP Sciences
ISSN:	0004-6361
Last Modified:	16 May 2023 17:50
URI:	https://orca.cardiff.ac.uk/id/eprint/12210

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