Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption
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Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption. / Bruderer, S.; Benz, A. O.; van Dishoeck, E. F.; Melchior, M.; Doty, S. D.; van der Tak, F.; Stäuber, P.; Wampfler, S. F.; Dedes, C.; Yildiz, U. A.; Pagani, L.; Giannini, T.; de Graauw, Th.; Whyborn, N.; Teyssier, D.; Jellema, W.; Shipman, R.; Schieder, R.; Honingh, N.; Caux, E.; Bächtold, W.; Csillaghy, A.; Monstein, C.; Bachiller, R.; Baudry, A.; 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.; Goicoechea, J. R.; Helmich, F.; Herczeg, G. J.; Herpin, F.; Hogerheijde, M. R.; Jacq, T.; Johnstone, D.; Jørgensen, Jes Kristian; Kristensen, L. E.; Larsson, B.; Lis, D.; Liseau, R.; Marseille, M.; McCoey, C.; Melnick, G.; Neufeld, D.; Nisini, B.; Olberg, M.; Parise, B.; Pearson, J. C.; Plume, R.; Risacher, C.; Santiago-García, J.; Saraceno, P.; Shipman, R.; Tafalla, M.; van Kempen, T. A.; Visser, R.; Wyrowski, F.
In: Astronomy & Astrophysics, Vol. 521, 01.10.2010, p. L44.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption
AU - Bruderer, S.
AU - Benz, A. O.
AU - van Dishoeck, E. F.
AU - Melchior, M.
AU - Doty, S. D.
AU - van der Tak, F.
AU - Stäuber, P.
AU - Wampfler, S. F.
AU - Dedes, C.
AU - Yildiz, U. A.
AU - Pagani, L.
AU - Giannini, T.
AU - de Graauw, Th.
AU - Whyborn, N.
AU - Teyssier, D.
AU - Jellema, W.
AU - Shipman, R.
AU - Schieder, R.
AU - Honingh, N.
AU - Caux, E.
AU - Bächtold, W.
AU - Csillaghy, A.
AU - Monstein, C.
AU - Bachiller, R.
AU - Baudry, A.
AU - Benedettini, M.
AU - Bergin, E.
AU - Bjerkeli, P.
AU - Blake, G. A.
AU - Bontemps, S.
AU - Braine, J.
AU - Caselli, P.
AU - Cernicharo, J.
AU - Codella, C.
AU - Daniel, F.
AU - di Giorgio, A. M.
AU - Dominik, C.
AU - Encrenaz, P.
AU - Fich, M.
AU - Fuente, A.
AU - Goicoechea, J. R.
AU - Helmich, F.
AU - Herczeg, G. J.
AU - Herpin, F.
AU - Hogerheijde, M. R.
AU - Jacq, T.
AU - Johnstone, D.
AU - Jørgensen, Jes Kristian
AU - Kristensen, L. E.
AU - Larsson, B.
AU - Lis, D.
AU - Liseau, R.
AU - Marseille, M.
AU - McCoey, C.
AU - Melnick, G.
AU - Neufeld, D.
AU - Nisini, B.
AU - Olberg, M.
AU - Parise, B.
AU - Pearson, J. C.
AU - Plume, R.
AU - Risacher, C.
AU - Santiago-García, J.
AU - Saraceno, P.
AU - Shipman, R.
AU - Tafalla, M.
AU - van Kempen, T. A.
AU - Visser, R.
AU - Wyrowski, F.
PY - 2010/10/1
Y1 - 2010/10/1
N2 - The Heterodyne Instrument for the Far Infrared (HIFI) onboard the Herschel Space Observatory allows the first observations of light diatomic molecules at high spectral resolution and in multiple transitions. Here, we report deep integrations using HIFI in different lines of hydrides towards the high-mass star forming region AFGL 2591. Detected are CH, CH+, NH, OH+, H2O+, while NH+ and SH+ have not been detected. All molecules except for CH and CH+ are seen in absorption with low excitation temperatures and at velocities different from the systemic velocity of the protostellar envelope. Surprisingly, the CH(JF,P = 3/22,- - 1/21,+ ) and CH+(J = 1-0, J = 2-1) lines are detected in emission at the systemic velocity. We can assign the absorption features to a foreground cloud and an outflow lobe, while the CH and CH+ emission stems from the envelope. The observed abundance and excitation of CH and CH+ can be explained in the scenario of FUV irradiated outflow walls, where a cavity etched out by the outflow allows protostellar FUV photons to irradiate and heat the envelope at larger distances driving the chemical reactions that produce these molecules. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Apppendices and Table 1 (pages 6 to 7) are only available in electronic form at http://www.aanda.org
AB - The Heterodyne Instrument for the Far Infrared (HIFI) onboard the Herschel Space Observatory allows the first observations of light diatomic molecules at high spectral resolution and in multiple transitions. Here, we report deep integrations using HIFI in different lines of hydrides towards the high-mass star forming region AFGL 2591. Detected are CH, CH+, NH, OH+, H2O+, while NH+ and SH+ have not been detected. All molecules except for CH and CH+ are seen in absorption with low excitation temperatures and at velocities different from the systemic velocity of the protostellar envelope. Surprisingly, the CH(JF,P = 3/22,- - 1/21,+ ) and CH+(J = 1-0, J = 2-1) lines are detected in emission at the systemic velocity. We can assign the absorption features to a foreground cloud and an outflow lobe, while the CH and CH+ emission stems from the envelope. The observed abundance and excitation of CH and CH+ can be explained in the scenario of FUV irradiated outflow walls, where a cavity etched out by the outflow allows protostellar FUV photons to irradiate and heat the envelope at larger distances driving the chemical reactions that produce these molecules. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Apppendices and Table 1 (pages 6 to 7) are only available in electronic form at http://www.aanda.org
U2 - 10.1051/0004-6361/201015098
DO - 10.1051/0004-6361/201015098
M3 - Journal article
VL - 521
SP - L44
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
ER -
ID: 35114151