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SPIRE spectroscopy of the prototypical Orion Bar photodissociation region

Habart, E.; Dartois, E.; Abergel, A.; Baluteau, J.-P.; Naylor, D.; Polehampton, E.; Joblin, C.; Ade, P.; Anderson, L. D.; André, P.; Arab, H.; Bernard, J.-P.; Blagrave, K.; Bontemps, S.; Boulanger, F.; Cohen, M.; Compiegne, M.; Cox, P.; Davis, G.; Emery, R.; Fulton, T.; Gry, C.; Huang, M.; Jones, S. C.; Kirk, J.; Lagache, G.; Lim, T.; Madden, S.; Makiwa, G.; Martin, P.; Miville-Deschênes, M.-A.; Molinari, S.; Moseley, H.; Motte, F.; Okumura, K.; Pinheiro Gonçalves, D.; Rodon, J.; Russeil, D.; Saraceno, P.; Sidher, S.; Spencer, L.; Swinyard, B.; Ward-Thompson, D.; White, G. J. and Zavagno, A. (2010). SPIRE spectroscopy of the prototypical Orion Bar photodissociation region. Astronomy & Astrophysics, 518, article no. L116.

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Aims. We present observations of the Orion Bar photodissociation region (PDR) obtained with the SPIRE instrument on-board Herschel.

Methods. We obtained SPIRE Fourier-transform spectrometer (FTS) sparse sampled maps of the Orion bar.

Results. The FTS wavelength coverage and sensitivity allow us to detect a wealth of rotational lines of CO (and its isotopologues), fine structure lines of C and N+, and emission lines from radicals and molecules such as CH+, CH, H2O or H2S. For species detected from the ground, our estimates of the column densities agree with previously published values. The comparison between 12CO and 13CO maps shows particularly the effects of optical depth and excitation in the molecular cloud. The distribution of the 12CO and 13CO lines with upper energy levels indicates the presence of warm (~100 - 150 K) CO. This warm CO component is a significant fraction of the total molecular gas, confirming previous ground based studies.

Item Type: Journal Article
Copyright Holders: 2010 ESO
ISSN: 1432-0746
Extra Information: 5 pp.
Keywords: infrared; lines and bands; molecules; evolution; submillimeter
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 25090
Depositing User: Ann McAloon
Date Deposited: 07 Dec 2010 10:33
Last Modified: 30 Jul 2014 00:54
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