Herschel-PACS spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2 [Letter]

Fich, M., Johnstone, D., van Kempen, T. A., McCoey, C., Fuente, A., Caselli, P., Kristensen, L. E., Plume, R., Cernicharo, J., Herczeg, G. J., van Dishoeck, E. F., Wampfler, S., Gaufre, P., Gill, J. J., Javadi, H., Justen, M., Laauwen, W., Luinge, W., Ossenkopf, V., Pearson, J., Bachiller, R., Baudry, A., Benedettini, M., Bergin, E., Benz, A. O., Bjerkeli, P., Blake, G., Bontemps, S., Braine, J., Bruderer, S., Codella, C., Daniel, F., di Giorgio, A. M., Dominik, C., Doty, S. D., Encrenaz, P., Giannini, T., Goicoechea, J. R., de Graauw, Th., Helmich, F., Herpin, F., Hogerheijde, M. R., Jacq, T., Jorgensen, J. K., Larsson, B., Lis, D., Liseau, R., Marseille, M., Melnick, G., Nisini, B., Olberg, M., Parise, Berengere, Risacher, C., Santiago, J., Saraceno, P., Shipman, R., Tafalla, M., van der Tak, F., Visser, R., Wyrowski, F. and Yildiz, U. A. 2010. Herschel-PACS spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2 [Letter]. Astronomy and Astrophysics 518 , L86. 10.1051/0004-6361/201014672

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Abstract

Aims. We present preliminary results of the first Herschel spectroscopic observations of NGC 7129 FIRS2, an intermediate mass star-forming region. We attempt to interpret the observations in the framework of an in-falling spherical envelope. Methods. The PACS instrument was used in line spectroscopy mode (R = 1000–5000) with 15 spectral bands between 63 and 185 μm. This provided good detections of 26 spectral lines seen in emission, including lines of H2O, CO, OH, O I, and C II. Results. Most of the detected lines, particularly those of H2O and CO, are substantially stronger than predicted by the spherical envelope models, typically by several orders of magnitude. In this paper we focus on what can be learned from the detected CO emission lines. Conclusions. It is unlikely that the much stronger than expected line emission arises in the (spherical) envelope of the YSO. The region hot enough to produce such high excitation lines within such an envelope is too small to produce the amount of emission observed. Virtually all of this high excitation emission must arise in structures such as as along the walls of the outflow cavity with the emission produced by a combination of UV photon heating and/or non-dissociative shocks.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	stars: formation; ISM: molecules
Additional Information:	Special Issue: Herschel: the first science highlights. Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 17/04/2014)
Publisher:	EDP Sciences
ISSN:	0004-6361
Date of First Compliant Deposit:	30 March 2016
Last Modified:	27 May 2023 00:16
URI:	https://orca.cardiff.ac.uk/id/eprint/52809

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