Herschel spectral surveys of star-forming regions. Overview of the 555-636 GHz range [Letter]

Ceccarelli, C., Bacmann, A., Boogert, A., Caux, E., Dominik, C., Lefloch, B., Lis, D., Schilke, P., van der Tak, F., Caselli, P., Cernicharo, J., Codella, C., Comito, C., Fuente, A., Baudry, A., Bell, T., Benedettini, M., Bergin, E. A., Blake, G. A., Bottinelli, S., Cabrit, S., Castets, A., Coutens, A., Crimier, N., Demyk, K., Encrenaz, P., Falgarone, E., Gerin, M., Goldsmith, P. F., Helmich, F., Hennebelle, P., Henning, T., Herbst, E., Hily-Blant, P., Jacq, T., Kahane, C., Kama, M., Klotz, A., Langer, W., Lord, S., Lorenzani, A., Maret, S., Melnick, G., Neufeld, D., Nisini, B., Pacheco, S., Pagani, L., Parise, Berengere, Pearson, J., Phillips, T., Salez, M., Saraceno, P., Schuster, K., Tielens, X., van der Wiel, M. H. D., Vastel, C., Viti, S., Wakelam, V., Walters, A., Wyrowski, F., Yorke, H., Liseau, R., Olberg, M., Szczerba, R., Benz, A. O. and Melchior, M. 2010. Herschel spectral surveys of star-forming regions. Overview of the 555-636 GHz range [Letter]. Astronomy and Astrophysics 521 , L22. 10.1051/0004-6361/201015081

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Abstract

High resolution line spectra of star-forming regions are mines of information: they provide unique clues to reconstruct the chemical, dynamical, and physical structure of the observed source. We present the first results from the Herschel key project “Chemical HErschel Surveys of Star forming regions”, CHESS. We report and discuss observations towards five CHESS targets, one outflow shock spot and four protostars with luminosities bewteen 20 and 2 × 105 : L1157-B1, IRAS 16293-2422, OMC2-FIR4, AFGL 2591, and NGC 6334I. The observations were obtained with the heterodyne spectrometer HIFI on board Herschel, with a spectral resolution of 1 MHz. They cover the frequency range 555–636 GHz, a range largely unexplored before the launch of the Herschel satellite. A comparison of the five spectra highlights spectacular differences in the five sources, for example in the density of methanol lines, or the presence/absence of lines from S-bearing molecules or deuterated species. We discuss how these differences can be attributed to the different star-forming mass or evolutionary status.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	astrochemistry ; stars: formation
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 16/04/2014)
Publisher:	EDP Sciences
ISSN:	0004-6361
Date of First Compliant Deposit:	30 March 2016
Last Modified:	14 May 2023 18:59
URI:	https://orca.cardiff.ac.uk/id/eprint/52790

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