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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., 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, 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 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: 04 Feb 2018 01:08
URI: http://orca.cf.ac.uk/id/eprint/12210

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