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SPIRE spectroscopy of the prototypical Orion Bar photodissociation region [Letter]

Habart, E., Dartois, E., Abergel, A., Baluteau, J.-P., Naylor, D., Polehampton, E., Joblin, C., Ade, Peter A. R., 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, Jason M., 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, Derek, White, G. J. and Zavagno, A. 2010. SPIRE spectroscopy of the prototypical Orion Bar photodissociation region [Letter]. Astronomy and Astrophysics 518 , L116. 10.1051/0004-6361/201014654

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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: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: infrared: ISM / ISM: lines and bands / ISM: molecules / evolution / submillimeter: ISM / ISM: general
Additional Information: 5 pp. Pdf uploaded in accordance with publisher's policy at (accessed 17/04/2014)
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 30 March 2016
Last Modified: 06 Apr 2020 15:06

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