Herschel-SPIRE spectroscopy of the DR21 molecular cloud core

White, G. J.; Abergel, A.; Spencer, L.; Schneider, N.; Naylor, D. A.; Anderson, L. D.; Joblin, C.; Ade, P.; 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, M.; Gry, C.; Habart, E.; Huang, M.; Jones, S.; Kirk, J. 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, D. and Zavagno, A. (2010). Herschel-SPIRE spectroscopy of the DR21 molecular cloud core. Astronomy & Astrophysics, 518, article no. L114.

DOI: https://doi.org/10.1051/0004-6361/201014622

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.

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