Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption

S. Bruderer; A. O. Benz; E. F. van Dishoeck; M. Melchior; S. D. Doty; F. van der Tak; P. Stäuber; S. F. Wampfler; C. Dedes; U. A. Yildiz; L. Pagani; T. Giannini; Th. de Graauw; N. Whyborn; D. Teyssier; W. Jellema; R. Shipman; R. Schieder; N. Honingh; E. Caux; W. Bächtold; A. Csillaghy; C. Monstein; R. Bachiller; A. Baudry; M. Benedettini; E. Bergin; P. Bjerkeli; G. A. Blake; S. Bontemps; J. Braine; P. Caselli; J. Cernicharo; C. Codella; F. Daniel; A. M. di Giorgio; C. Dominik; P. Encrenaz; M. Fich; A. Fuente; J. R. Goicoechea; F. Helmich; G. J. Herczeg; F. Herpin; M. R. Hogerheijde; T. Jacq; D. Johnstone; Jes Kristian Jørgensen; L. E. Kristensen; B. Larsson; D. Lis; R. Liseau; M. Marseille; C. McCoey; G. Melnick; D. Neufeld; B. Nisini; M. Olberg; B. Parise; J. C. Pearson; R. Plume; C. Risacher; J. Santiago-García; P. Saraceno; R. Shipman; M. Tafalla; T. A. van Kempen; R. Visser; F. Wyrowski

doi:10.1051/0004-6361/201015098

Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption

S. Bruderer, A. O. Benz, E. F. van Dishoeck, M. Melchior, S. D. Doty, F. van der Tak, P. Stäuber, S. F. Wampfler, C. Dedes, U. A. Yildiz, L. Pagani, T. Giannini, Th. de Graauw, N. Whyborn, D. Teyssier, W. Jellema, R. Shipman, R. Schieder, N. Honingh, E. CauxW. Bächtold, A. Csillaghy, C. Monstein, R. Bachiller, A. Baudry, M. Benedettini, E. Bergin, P. Bjerkeli, G. A. Blake, S. Bontemps, J. Braine, P. Caselli, J. Cernicharo, C. Codella, F. Daniel, A. M. di Giorgio, C. Dominik, P. Encrenaz, M. Fich, A. Fuente, J. R. Goicoechea, F. Helmich, G. J. Herczeg, F. Herpin, M. R. Hogerheijde, T. Jacq, D. Johnstone, Jes Kristian Jørgensen, L. E. Kristensen, B. Larsson, D. Lis, R. Liseau, M. Marseille, C. McCoey, G. Melnick, D. Neufeld, B. Nisini, M. Olberg, B. Parise, J. C. Pearson, R. Plume, C. Risacher, J. Santiago-García, P. Saraceno, R. Shipman, M. Tafalla, T. A. van Kempen, R. Visser, F. Wyrowski

The Cosmic Dawn Center

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Abstract

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(J_F,P = 3/2_2,--1/2_1,+) 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.

Original language	English
Journal	Astronomy & Astrophysics
Volume	521
Pages (from-to)	L44
Number of pages	7
ISSN	0004-6361
DOIs	https://doi.org/10.1051/0004-6361/201015098
Publication status	Published - 1 Oct 2010

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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, T., Whyborn, N., Teyssier, D., Jellema, W., Shipman, R., Schieder, R., Honingh, N., ... Wyrowski, F. (2010). Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption. Astronomy & Astrophysics, 521, L44. https://doi.org/10.1051/0004-6361/201015098

Bruderer, S, Benz, AO, van Dishoeck, EF, Melchior, M, Doty, SD, van der Tak, F, Stäuber, P, Wampfler, SF, Dedes, C, Yildiz, UA, Pagani, L, Giannini, T, de Graauw, T, 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, GA, Bontemps, S, Braine, J, Caselli, P, Cernicharo, J, Codella, C, Daniel, F, di Giorgio, AM, Dominik, C, Encrenaz, P, Fich, M, Fuente, A, Goicoechea, JR, Helmich, F, Herczeg, GJ, Herpin, F, Hogerheijde, MR, Jacq, T, Johnstone, D, Jørgensen, JK, Kristensen, LE, Larsson, B, Lis, D, Liseau, R, Marseille, M, McCoey, C, Melnick, G, Neufeld, D, Nisini, B, Olberg, M, Parise, B, Pearson, JC, Plume, R, Risacher, C, Santiago-García, J, Saraceno, P, Shipman, R, Tafalla, M, van Kempen, TA, Visser, R & Wyrowski, F 2010, 'Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption', Astronomy & Astrophysics, vol. 521, pp. L44. https://doi.org/10.1051/0004-6361/201015098

@article{e66732b62fbb4f299fea61d3bf9b6976,

title = "Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption",

abstract = "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.",

author = "S. Bruderer and Benz, {A. O.} and {van Dishoeck}, {E. F.} and M. Melchior and Doty, {S. D.} and {van der Tak}, F. and P. St{\"a}uber and Wampfler, {S. F.} and C. Dedes and Yildiz, {U. A.} and L. Pagani and T. Giannini and {de Graauw}, Th. and N. Whyborn and D. Teyssier and W. Jellema and R. Shipman and R. Schieder and N. Honingh and E. Caux and W. B{\"a}chtold and A. Csillaghy and C. Monstein and R. Bachiller and A. Baudry and M. Benedettini and E. Bergin and P. Bjerkeli and Blake, {G. A.} and S. Bontemps and J. Braine and P. Caselli and J. Cernicharo and C. Codella and F. Daniel and {di Giorgio}, {A. M.} and C. Dominik and P. Encrenaz and M. Fich and A. Fuente and Goicoechea, {J. R.} and F. Helmich and Herczeg, {G. J.} and F. Herpin and Hogerheijde, {M. R.} and T. Jacq and D. Johnstone and J{\o}rgensen, {Jes Kristian} and Kristensen, {L. E.} and B. Larsson and D. Lis and R. Liseau and M. Marseille and C. McCoey and G. Melnick and D. Neufeld and B. Nisini and M. Olberg and B. Parise and Pearson, {J. C.} and R. Plume and C. Risacher and J. Santiago-Garc{\'i}a and P. Saraceno and R. Shipman and M. Tafalla and {van Kempen}, {T. A.} and R. Visser and F. Wyrowski",

year = "2010",

month = oct,

day = "1",

doi = "10.1051/0004-6361/201015098",

language = "English",

volume = "521",

pages = "L44",

journal = "Astronomy and Astrophysics Supplement Series",

issn = "0004-6361",

publisher = "E D P Sciences",

}

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.

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.

U2 - 10.1051/0004-6361/201015098

DO - 10.1051/0004-6361/201015098

M3 - Journal article

SN - 0004-6361

VL - 521

SP - L44

JO - Astronomy and Astrophysics Supplement Series

JF - Astronomy and Astrophysics Supplement Series

ER -

Herschel/HIFI detections of hydrides towards AFGL 2591. Envelope emission versus tenuous cloud absorption

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