Herschel-SPIRE spectroscopy of the DR21 molecular cloud core
Miville-Deschênes, M. -A.; Boulanger, F.; Abergel, A.; Bernard, J. -P.; Lagache, G.; White, G. J.; Okumura, K.; Schneider, N.; Bontemps, S.; Spencer, L.; Zavagno, A.; Griffin, M.; Madden, S.; Motte, F.; Ward-Thompson, D.; Pinheiro Gonçalves, D.; Joblin, C.; Cohen, M.; André, P.; Ade, P.; Cox, P.; Huang, M.; Swinyard, B. M.; Molinari, S.; Russeil, D.; Dartois, E.; Habart, E.; Lim, T.; Sidher, S.; Saraceno, P.; Gry, C.; Naylor, D. A.; Kirk, J. M.; Martin, P.; Anderson, L. D.; Baluteau, J. -P.; Leeks, S.; Rodón, J. A.; Fulton, T.; Makiwa, G.; Arab, H.; Blagrave, K.; Davis, G.; Emery, R.; Moseley, H.; Polehampton, E.; Jones, S.; Compiegne, M.; Gom, B.; Rodet, T.
United Kingdom, France, Canada, India, United States, Italy
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 n{H_2} 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.
Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.