We present far-infrared spectra and maps of the DR21 molecular cloud core between 196 and 671 microns, 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 x 10^4 cm-3, CO column density N(CO) ~ 3.5 x 10^18 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 x 10^21 cm^-2. Astronomy & Astrophysics HERSCHEL special Issue, in press.
@article{arxiv.1005.2874,
title = {Herschel-SPIRE spectroscopy of the DR21 molecular cloud core},
author = {Glenn J. White and A. Abergel and L. Spencer and N. Schneider and D. A. Naylor and L. D. Anderson and C. Joblin and P. Ade and P. André and H. Arab and J. -P. Baluteau and J. -P. Bernard and K. Blagrave and S. Bontemps and F. Boulanger and M. Cohen and M. Compiegne and P. Cox and E. Dartois and G. Davis and R. Emery and T. Fulton and B. Gom and M. Griffin and C. Gry and E. Habart and M. Huang and S. Jones and J. M. Kirk and G. Lagache and S. Leeks and T. Lim and S. Madden and G. Makiwa and P. Martin and M. -A. Miville-Deschênes and S. Molinari and H. Moseley and F. Motte and K. Okumura and D. Pinheiro Gocalvez and E. Polehampton and T. Rodet and J. A. Rodón and D. Russeil and P. Saraceno and S. Sidher and B. M. Swinyard and D. Ward-Thompson and A. Zavagno},
journal= {arXiv preprint arXiv:1005.2874},
year = {2015}
}