Wampfler, S. F., Herczeg, G. J., Bruderer, S., Benz, A. O., van Dishoeck, E. F., Kristensen, L. E., Visser, R., Doty, S. D., Melchior, M., van Kempen, T. A., Yildiz, U. A., Dedes, C., Goicoechea, J. R., Baudry, A., Melnick, G., Bachiller, R., Benedettini, M., Bergin, E., Bjerkeli, P., Blake, G. A., Bontemps, S., Braine, J., Caselli, P., Cernicharo, J., Codella, C., Daniel, F., di Giorgio, A. M., Dominik, C., Encrenaz, P., Fich, M., Fuente, A., Giannini, T., de Graauw, Th., Helmich, F., Herpin, F., Hogerheijde, M. R., Jacq, T., Johnstone, D., Jorgensen, J. K., Larsson, B., Lis, D., Liseau, R., Marseille, M., Mc Coey, C., Neufeld, D., Nisini, B., Olberg, M., Parise, B., Pearson, J. C., Plume, R., Risacher, C., Santiago-Garcia, J., Saraceno, P., Shipman, R., Tafalla, M., van der Tak, F. F. S., Wyrowski, F., Roelfsema, P., Jellema, W., Dieleman, P., Caux, E. and Stutzki, J. (2010). Herschel observations of the hydroxyl radical (OH) in young stellar objects. Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 0004-6361

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Abstract

Aims. Water In Star-forming regions with Herschel (WISH) is a Herschel key program investigating the water chemistry in young stellar objects (YSOs) during protostellar evolution. Hydroxyl (OH) is one of the reactants in the chemical network most closely linked to the formation and destruction of H2O. High-temperature (T greater than or similar to 250 K) chemistry connects OH and H2O through the OH + H-2 double left right arrow H2O + H reactions. Formation of H2O from OH is efficient in the high-temperature regime found in shocks and the innermost part of protostellar envelopes. Moreover, in the presence of UV photons, OH can be produced from the photo-dissociation of H2O through H2O + gamma(UV) double right arrow OH + H. Methods. High-resolution spectroscopy of the 163.12 mu m triplet of OH towards HH 46 and NGC 1333 IRAS 2A was carried out with the Heterodyne Instrument for the Far Infrared (HIFI) on board the Herschel Space Observatory. The low-and intermediate-mass protostars HH 46, TMR 1, IRAS 15398-3359, DK Cha, NGC 7129 FIRS 2, and NGC 1333 IRAS 2A were observed with the Photodetector Array Camera and Spectrometer (PACS) on Herschel in four transitions of OH and two [OI] lines. Results. The OH transitions at 79, 84, 119, and 163 mu m and [OI] emission at 63 and 145 mu m were detected with PACS towards the class I low-mass YSOs as well as the intermediate-mass and class I Herbig Ae sources. No OH emission was detected from the class 0 YSO NGC 1333 IRAS 2A, though the 119 mu m was detected in absorption. With HIFI, the 163.12 mu m was not detected from HH 46 and only tentatively detected from NGC 1333 IRAS 2A. The combination of the PACS and HIFI results for HH 46 constrains the line width (FWHM greater than or similar to 11 km s(-1)) and indicates that the OH emission likely originates from shocked gas. This scenario is supported by trends of the OH flux increasing with the [OI] flux and the bolometric luminosity, as found in our sample. Similar OH line ratios for most sources suggest that OH has comparable excitation temperatures despite the different physical properties of the sources.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Wampfler, S. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herczeg, G. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bruderer, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benz, A. O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Dishoeck, E. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kristensen, L. E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Visser, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Doty, S. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Melchior, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Kempen, T. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yildiz, U. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dedes, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goicoechea, J. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baudry, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Melnick, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bachiller, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benedettini, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bergin, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bjerkeli, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blake, G. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bontemps, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braine, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caselli, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Codella, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Daniel, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
di Giorgio, A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dominik, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fich, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fuente, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giannini, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Graauw, Th.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Helmich, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herpin, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hogerheijde, M. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jacq, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Johnstone, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jorgensen, J. K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Larsson, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liseau, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marseille, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mc Coey, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neufeld, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nisini, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Olberg, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parise, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pearson, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plume, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Risacher, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Santiago-Garcia, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Saraceno, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shipman, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tafalla, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Tak, F. F. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wyrowski, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Roelfsema, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jellema, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dieleman, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caux, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stutzki, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-495086
DOI: 10.1051/0004-6361/201015112
Journal or Publication Title: Astron. Astrophys.
Volume: 521
Date: 2010
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 0004-6361
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PHYSICAL STRUCTURE; PACS SPECTROSCOPY; MOLECULAR CLOUD; MASS PROTOSTARS; CLASS-0 SOURCES; CO OBSERVATIONS; FIRS 2; HH 46; EMISSION; PHOTODISSOCIATIONMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49508

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