Hydrides in young stellar objects: Radiation tracers in a protostar-disk-outflow system

A. O. Benz; S. Bruderer; E. F. van Dishoeck; P. Staeuber; S. F. Wampfler; M. Melchior; C. Dedes; F. Wyrowski; S. D. Doty; F. van der Tak; W. Baechtold; A. Csillaghy; A. Megej; C. Monstein; M. Soldati; 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; P. Dieleman; C. Dominik; P. Encrenaz; M. Fich; A. Fuente; T. Giannini; J. R. Goicoechea; Th. de Graauw; F. Helmich; G. J. Herczeg; F. Herpin; M. R. Hogerheijde; T. Jacq; W. Jellema; D. Johnstone; J. K. Jorgensen; L. E. Kristensen; B. Larsson; D. Lis; R. Liseau; M. Marseille; C. McCoey; G. Melnick; D. Neufeld; B. Nisini; M. Olberg; V. Ossenkopf; B. Parise; J. C. Pearson; R. Plume; C. Risacher; J. Santiago-Garcia; P. Saraceno; R. Schieder; R. Shipman; J. Stutzki; M. Tafalla; A. G. G. M. Tielens; T. A. van Kempen; R. Visser; U. A. Yildiz

doi:10.1051/0004-6361/201015111

Hydrides in young stellar objects: Radiation tracers in a protostar-disk-outflow system

A. O. Benz^*, S. Bruderer, E. F. van Dishoeck, P. Staeuber, S. F. Wampfler, M. Melchior, C. Dedes, F. Wyrowski, S. D. Doty, F. van der Tak, W. Baechtold, A. Csillaghy, A. Megej, C. Monstein, M. Soldati, R. Bachiller, A. Baudry, M. Benedettini, E. Bergin, P. BjerkeliG.A. Blake, S. Bontemps, J. Braine, P. Caselli, J. Cernicharo, C. Codella, F. Daniel, A. M. di Giorgio, P. Dieleman, C. Dominik, P. Encrenaz, M. Fich, A. Fuente, T. Giannini, J. R. Goicoechea, Th. de Graauw, F. Helmich, G. J. Herczeg, F. Herpin, M. R. Hogerheijde, T. Jacq, W. Jellema, D. Johnstone, J. K. Jorgensen, L. E. Kristensen, B. Larsson, D. Lis, R. Liseau, M. Marseille, C. McCoey, G. Melnick, D. Neufeld, B. Nisini, M. Olberg, V. Ossenkopf, B. Parise, J. C. Pearson, R. Plume, C. Risacher, J. Santiago-Garcia, P. Saraceno, R. Schieder, R. Shipman, J. Stutzki, M. Tafalla, A. G. G. M. Tielens, T. A. van Kempen, R. Visser, U. A. Yildiz

^*Bijbehorende auteur voor dit werk

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Context. Hydrides of the most abundant heavier elements are fundamental molecules in cosmic chemistry. Some of them trace gas irradiated by UV or X-rays.

Aims. We explore the abundances of major hydrides in W3 IRS5, a prototypical region of high-mass star formation.

Methods. W3 IRS5 was observed by HIFI on the Herschel Space Observatory with deep integration (similar or equal to 2500 s) in 8 spectral regions.

Results. The target lines including CH, NH, H3O+, and the new molecules SH+, H2O+, and OH+ are detected. The H2O+ and OH+ J = 1-0 lines are found mostly in absorption, but also appear to exhibit weak emission (P-Cyg-like). Emission requires high density, thus originates most likely near the protostar. This is corroborated by the absence of line shifts relative to the young stellar object (YSO). In addition, H2O+ and OH+ also contain strong absorption components at a velocity shifted relative to W3 IRS5, which are attributed to foreground clouds.

Conclusions. The molecular column densities derived from observations correlate well with the predictions of a model that assumes the main emission region is in outflow walls, heated and irradiated by protostellar UV radiation.

Originele taal-2	English
Artikelnummer	L35
Aantal pagina's	5
Tijdschrift	Astronomy & astrophysics
Volume	521
DOI's	https://doi.org/10.1051/0004-6361/201015111
Status	Published - okt.-2010

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Benz, A. O., Bruderer, S., van Dishoeck, E. F., Staeuber, P., Wampfler, S. F., Melchior, M., Dedes, C., Wyrowski, F., Doty, S. D., van der Tak, F., Baechtold, W., Csillaghy, A., Megej, A., Monstein, C., Soldati, M., Bachiller, R., Baudry, A., Benedettini, M., Bergin, E., ... Yildiz, U. A. (2010). Hydrides in young stellar objects: Radiation tracers in a protostar-disk-outflow system. Astronomy & astrophysics, 521, [L35]. https://doi.org/10.1051/0004-6361/201015111

@article{2d1c4db6d89149adb9c5bde9372bd990,

title = "Hydrides in young stellar objects: Radiation tracers in a protostar-disk-outflow system",

abstract = "Context. Hydrides of the most abundant heavier elements are fundamental molecules in cosmic chemistry. Some of them trace gas irradiated by UV or X-rays.Aims. We explore the abundances of major hydrides in W3 IRS5, a prototypical region of high-mass star formation.Methods. W3 IRS5 was observed by HIFI on the Herschel Space Observatory with deep integration (similar or equal to 2500 s) in 8 spectral regions.Results. The target lines including CH, NH, H3O+, and the new molecules SH+, H2O+, and OH+ are detected. The H2O+ and OH+ J = 1-0 lines are found mostly in absorption, but also appear to exhibit weak emission (P-Cyg-like). Emission requires high density, thus originates most likely near the protostar. This is corroborated by the absence of line shifts relative to the young stellar object (YSO). In addition, H2O+ and OH+ also contain strong absorption components at a velocity shifted relative to W3 IRS5, which are attributed to foreground clouds.Conclusions. The molecular column densities derived from observations correlate well with the predictions of a model that assumes the main emission region is in outflow walls, heated and irradiated by protostellar UV radiation.",

keywords = "astrochemistry, line: identification, stars: formation, stars: massive, photon-dominated region, submillimeter: ISM, H2O+, SPECTROSCOPY, CHEMISTRY, REGIONS, W3IRS5, DR21, H3O+",

author = "Benz, {A. O.} and S. Bruderer and {van Dishoeck}, {E. F.} and P. Staeuber and Wampfler, {S. F.} and M. Melchior and C. Dedes and F. Wyrowski and Doty, {S. D.} and {van der Tak}, F. and W. Baechtold and A. Csillaghy and A. Megej and C. Monstein and M. Soldati and R. Bachiller and A. Baudry and M. Benedettini and E. Bergin and P. Bjerkeli and G.A. Blake and S. Bontemps and J. Braine and P. Caselli and J. Cernicharo and C. Codella and F. Daniel and {di Giorgio}, {A. M.} and P. Dieleman and C. Dominik and P. Encrenaz and M. Fich and A. Fuente and T. Giannini and Goicoechea, {J. R.} and {de Graauw}, Th. and F. Helmich and Herczeg, {G. J.} and F. Herpin and Hogerheijde, {M. R.} and T. Jacq and W. Jellema and D. Johnstone and Jorgensen, {J. K.} 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 V. Ossenkopf and B. Parise and Pearson, {J. C.} and R. Plume and C. Risacher and J. Santiago-Garcia and P. Saraceno and R. Schieder and R. Shipman and J. Stutzki and M. Tafalla and Tielens, {A. G. G. M.} and {van Kempen}, {T. A.} and R. Visser and Yildiz, {U. A.}",

year = "2010",

month = oct,

doi = "10.1051/0004-6361/201015111",

language = "English",

volume = "521",

journal = "Astronomy & astrophysics",

issn = "0004-6361",

publisher = " EDP Sciences",

}

Benz, AO, Bruderer, S, van Dishoeck, EF, Staeuber, P, Wampfler, SF, Melchior, M, Dedes, C, Wyrowski, F, Doty, SD, van der Tak, F, Baechtold, W, Csillaghy, A, Megej, A, Monstein, C, Soldati, M, 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, Dieleman, P, Dominik, C, Encrenaz, P, Fich, M, Fuente, A, Giannini, T, Goicoechea, JR, de Graauw, T, Helmich, F, Herczeg, GJ, Herpin, F, Hogerheijde, MR, Jacq, T, Jellema, W, Johnstone, D, Jorgensen, JK, Kristensen, LE, Larsson, B, Lis, D, Liseau, R, Marseille, M, McCoey, C, Melnick, G, Neufeld, D, Nisini, B, Olberg, M, Ossenkopf, V, Parise, B, Pearson, JC, Plume, R, Risacher, C, Santiago-Garcia, J, Saraceno, P, Schieder, R, Shipman, R, Stutzki, J, Tafalla, M, Tielens, AGGM, van Kempen, TA, Visser, R & Yildiz, UA 2010, 'Hydrides in young stellar objects: Radiation tracers in a protostar-disk-outflow system', Astronomy & astrophysics, vol. 521, L35. https://doi.org/10.1051/0004-6361/201015111

TY - JOUR

T1 - Hydrides in young stellar objects

T2 - Radiation tracers in a protostar-disk-outflow system

AU - Benz, A. O.

AU - Bruderer, S.

AU - van Dishoeck, E. F.

AU - Staeuber, P.

AU - Wampfler, S. F.

AU - Melchior, M.

AU - Dedes, C.

AU - Wyrowski, F.

AU - Doty, S. D.

AU - van der Tak, F.

AU - Baechtold, W.

AU - Csillaghy, A.

AU - Megej, A.

AU - Monstein, C.

AU - Soldati, M.

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 - Dieleman, P.

AU - Dominik, C.

AU - Encrenaz, P.

AU - Fich, M.

AU - Fuente, A.

AU - Giannini, T.

AU - Goicoechea, J. R.

AU - de Graauw, Th.

AU - Helmich, F.

AU - Herczeg, G. J.

AU - Herpin, F.

AU - Hogerheijde, M. R.

AU - Jacq, T.

AU - Jellema, W.

AU - Johnstone, D.

AU - Jorgensen, J. K.

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 - Ossenkopf, V.

AU - Parise, B.

AU - Pearson, J. C.

AU - Plume, R.

AU - Risacher, C.

AU - Santiago-Garcia, J.

AU - Saraceno, P.

AU - Schieder, R.

AU - Shipman, R.

AU - Stutzki, J.

AU - Tafalla, M.

AU - Tielens, A. G. G. M.

AU - van Kempen, T. A.

AU - Visser, R.

AU - Yildiz, U. A.

PY - 2010/10

Y1 - 2010/10

N2 - Context. Hydrides of the most abundant heavier elements are fundamental molecules in cosmic chemistry. Some of them trace gas irradiated by UV or X-rays.Aims. We explore the abundances of major hydrides in W3 IRS5, a prototypical region of high-mass star formation.Methods. W3 IRS5 was observed by HIFI on the Herschel Space Observatory with deep integration (similar or equal to 2500 s) in 8 spectral regions.Results. The target lines including CH, NH, H3O+, and the new molecules SH+, H2O+, and OH+ are detected. The H2O+ and OH+ J = 1-0 lines are found mostly in absorption, but also appear to exhibit weak emission (P-Cyg-like). Emission requires high density, thus originates most likely near the protostar. This is corroborated by the absence of line shifts relative to the young stellar object (YSO). In addition, H2O+ and OH+ also contain strong absorption components at a velocity shifted relative to W3 IRS5, which are attributed to foreground clouds.Conclusions. The molecular column densities derived from observations correlate well with the predictions of a model that assumes the main emission region is in outflow walls, heated and irradiated by protostellar UV radiation.

AB - Context. Hydrides of the most abundant heavier elements are fundamental molecules in cosmic chemistry. Some of them trace gas irradiated by UV or X-rays.Aims. We explore the abundances of major hydrides in W3 IRS5, a prototypical region of high-mass star formation.Methods. W3 IRS5 was observed by HIFI on the Herschel Space Observatory with deep integration (similar or equal to 2500 s) in 8 spectral regions.Results. The target lines including CH, NH, H3O+, and the new molecules SH+, H2O+, and OH+ are detected. The H2O+ and OH+ J = 1-0 lines are found mostly in absorption, but also appear to exhibit weak emission (P-Cyg-like). Emission requires high density, thus originates most likely near the protostar. This is corroborated by the absence of line shifts relative to the young stellar object (YSO). In addition, H2O+ and OH+ also contain strong absorption components at a velocity shifted relative to W3 IRS5, which are attributed to foreground clouds.Conclusions. The molecular column densities derived from observations correlate well with the predictions of a model that assumes the main emission region is in outflow walls, heated and irradiated by protostellar UV radiation.

KW - astrochemistry

KW - line: identification

KW - stars: formation

KW - stars: massive

KW - photon-dominated region

KW - submillimeter: ISM

KW - H2O+

KW - SPECTROSCOPY

KW - CHEMISTRY

KW - REGIONS

KW - W3IRS5

KW - DR21

KW - H3O+

U2 - 10.1051/0004-6361/201015111

DO - 10.1051/0004-6361/201015111

M3 - Article

SN - 0004-6361

VL - 521

JO - Astronomy & astrophysics

JF - Astronomy & astrophysics

M1 - L35

ER -