Probable detection of H_2D+ in the starless core Barnard 68

M. R. Hogerheijde; P. Caselli; M. Emprechtinger; F. F. S. van der Tak; J. Alves; A. Belloche; R. Güsten; A. A. Lundgren; L.-Å. Nyman; N. Volgenau; M. C. Wiedner

doi:10.1051/0004-6361:20065104

Probable detection of H_2D+ in the starless core Barnard 68

M. R. Hogerheijde, P. Caselli, M. Emprechtinger, F. F. S. van der Tak, J. Alves, A. Belloche, R. Güsten, A. A. Lundgren, L.-Å. Nyman, N. Volgenau, M. C. Wiedner

Department of Astrophysics

Publications: Contribution to journal › Short communication › Peer Reviewed

Abstract

Context: The presence of H2D+ in dense cloud cores underlies ion-molecule reactions that strongly enhance the deuterium fractionation of many molecular species. Aims: We determine the H2D+abundance in one starless core, Barnard 68, that has a particularly well established physical, chemical, and dynamical structure. Methods: We observed the ortho-H2D+ ground-state line110-111, the N2H+ J=4-3 line, and theH13CO+ 4-3 line with the APEX telescope. Results:We report the probable detection of the o-H2D+ line at an intesity T_mb=0.22± 0.08 K and exclusively thermal line width,and find only upper limits to the N2H+ 4-3 andH13CO+ 4-3 intensities. Conclusions: Within the uncertainties in the chemical reaction rates and the collisional excitation rates, chemical model calculations and excitation simulations reproduce the observed intensities and that of o-H2D+ in particular.

Original language	English
Pages (from-to)	L59-L62
Journal	Astronomy & Astrophysics
Volume	454
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20065104
Publication status	Published - 1 Aug 2006

Austrian Fields of Science 2012

103003 Astronomy

Keywords

ISM: abundances
ISM: individual objects: Barnard 68
ISM: molecules
submillimeter

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10.1051/0004-6361:20065104

http://adsabs.harvard.edu/abs/2006A%26A...454L..59H

Cite this

@article{637600d55ec54955bf98d41dd33beafb,

title = "Probable detection of H_2D+ in the starless core Barnard 68",

abstract = "Context: The presence of H2D+ in dense cloud cores underlies ion-molecule reactions that strongly enhance the deuterium fractionation of many molecular species. Aims: We determine the H2D+abundance in one starless core, Barnard 68, that has a particularly well established physical, chemical, and dynamical structure. Methods: We observed the ortho-H2D+ ground-state line110-111, the N2H+ J=4-3 line, and theH13CO+ 4-3 line with the APEX telescope. Results:We report the probable detection of the o-H2D+ line at an intesity T_mb=0.22± 0.08 K and exclusively thermal line width,and find only upper limits to the N2H+ 4-3 andH13CO+ 4-3 intensities. Conclusions: Within the uncertainties in the chemical reaction rates and the collisional excitation rates, chemical model calculations and excitation simulations reproduce the observed intensities and that of o-H2D+ in particular.",

keywords = "ISM: abundances, ISM: individual objects: Barnard 68, ISM: molecules, submillimeter",

author = "Hogerheijde, {M. R.} and P. Caselli and M. Emprechtinger and {van der Tak}, {F. F. S.} and J. Alves and A. Belloche and R. G{\"u}sten and Lundgren, {A. A.} and L.-{\AA}. Nyman and N. Volgenau and Wiedner, {M. C.}",

year = "2006",

month = aug,

day = "1",

doi = "10.1051/0004-6361:20065104",

language = "English",

volume = "454",

pages = "L59--L62 ",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

number = "2",

}

TY - JOUR

T1 - Probable detection of H_2D+ in the starless core Barnard 68

AU - Hogerheijde, M. R.

AU - Caselli, P.

AU - Emprechtinger, M.

AU - van der Tak, F. F. S.

AU - Alves, J.

AU - Belloche, A.

AU - Güsten, R.

AU - Lundgren, A. A.

AU - Nyman, L.-Å.

AU - Volgenau, N.

AU - Wiedner, M. C.

PY - 2006/8/1

Y1 - 2006/8/1

N2 - Context: The presence of H2D+ in dense cloud cores underlies ion-molecule reactions that strongly enhance the deuterium fractionation of many molecular species. Aims: We determine the H2D+abundance in one starless core, Barnard 68, that has a particularly well established physical, chemical, and dynamical structure. Methods: We observed the ortho-H2D+ ground-state line110-111, the N2H+ J=4-3 line, and theH13CO+ 4-3 line with the APEX telescope. Results:We report the probable detection of the o-H2D+ line at an intesity T_mb=0.22± 0.08 K and exclusively thermal line width,and find only upper limits to the N2H+ 4-3 andH13CO+ 4-3 intensities. Conclusions: Within the uncertainties in the chemical reaction rates and the collisional excitation rates, chemical model calculations and excitation simulations reproduce the observed intensities and that of o-H2D+ in particular.

AB - Context: The presence of H2D+ in dense cloud cores underlies ion-molecule reactions that strongly enhance the deuterium fractionation of many molecular species. Aims: We determine the H2D+abundance in one starless core, Barnard 68, that has a particularly well established physical, chemical, and dynamical structure. Methods: We observed the ortho-H2D+ ground-state line110-111, the N2H+ J=4-3 line, and theH13CO+ 4-3 line with the APEX telescope. Results:We report the probable detection of the o-H2D+ line at an intesity T_mb=0.22± 0.08 K and exclusively thermal line width,and find only upper limits to the N2H+ 4-3 andH13CO+ 4-3 intensities. Conclusions: Within the uncertainties in the chemical reaction rates and the collisional excitation rates, chemical model calculations and excitation simulations reproduce the observed intensities and that of o-H2D+ in particular.

KW - ISM: abundances

KW - ISM: individual objects: Barnard 68

KW - ISM: molecules

KW - submillimeter

U2 - 10.1051/0004-6361:20065104

DO - 10.1051/0004-6361:20065104

M3 - Short communication

SN - 0004-6361

VL - 454

SP - L59-L62

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

IS - 2

ER -

Probable detection of H_2D+ in the starless core Barnard 68

Abstract

Austrian Fields of Science 2012

Keywords

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