Herschel-SPIRE spectroscopy of the DR21 molecular cloud core

Glenn J. White 1, 2 A. Abergel 3 L. Spencer N. Schneider 4 D. A. Naylor L. D. Anderson 5 C. Joblin 6 P. Ade P. André 7 H. Arab J. -P. Baluteau 5 J. -P. Bernard K. Blagrave S. Bontemps 8, 9, 10, 11 F. Boulanger 3 M. Cohen M. Compiegne P. Cox E. Dartois 3 G. Davis 12 R. Emery T. Fulton B. Gom M. Griffin 13 C. Gry 5 E. Habart 3 M. Huang 14 S. Jones 15, 16 J. M. Kirk G. Lagache 3 S. Leeks 17 T. Lim 18 S. Madden 19 G. Makiwa P. Martin 20 M. -A. Miville-Deschênes 21 S. Molinari 22 H. Moseley F. Motte 4, 23 K. Okumura D. Pinheiro Gocalvez E. Polehampton T. Rodet J. A. Rodón D. Russeil 5 P. Saraceno 22 S. Sidher B. M. Swinyard D. Ward-Thompson 13 A. Zavagno 5, 24
Abstract : 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.
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Glenn J. White, A. Abergel, L. Spencer, N. Schneider, D. A. Naylor, et al.. Herschel-SPIRE spectroscopy of the DR21 molecular cloud core. Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 518, pp.L114. <10.1051/0004-6361/201014622>. <hal-00523032>



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