The chemistry of ions in the Orion Bar I. – CH+, SH+, and CF+ - The effect of high electron density and vibrationally excited H2 in a warm PDR surface

Z. Nagy; F. F. S. Van der Tak; V. Ossenkopf; M. Gerin; F. Le Petit; J. Le Bourlot; J. H. Black; J. R. Goicoechea; C. Joblin; M. Röllig; E. A. Bergin

doi:10.1051/0004-6361/201220519

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Volume 550 (February 2013)

A&A, 550 (2013) A96

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Table 2

Detected CH⁺, SH⁺, and CF⁺ transitions; Gaussian fit parameters for the velocity-resolved transitions observed with HIFI and PACS; and upper limits for non-detections of other CF⁺ and SH⁺ transitions.

Line		V _LSR	ΔV	T _peak	rms (T_MB)
	(K km s^-1)	(km s^-1)	(km s^-1)	(K)	(K)

CH⁺ 1−0	24.9 ± 0.20	10.5 ± 0.02	5.46 ± 0.04	4.28 ± 0.15	0.12
CH⁺ 2−1	10.6 ± 0.20	10.4 ± 0.05	4.57 ± 0.11	2.18 ± 0.22	0.23
CH⁺ 3−2	2.19 ± 0.31
CH⁺ 4−3	1.01 ± 0.19
CH⁺ 5−4	0.42 ± 0.15
CH⁺ 6−5	0.17 ± 0.06

¹³CH⁺ 1−0¹	0.46 ± 0.11	11.39 ± 0.15	1.30 ± 0.34	0.34 ± 0.10	0.15

SH⁺N_J = 1₂−0₁F = 3/2−1/2	0.34 ± 0.02	10.92 ± 0.09	3.00²	0.11 ± 0.02	0.02
SH⁺N_J = 1₂−0₁F = 5/2−3/2	0.57 ± 0.02	10.84 ± 0.06	3.00²	0.18 ± 0.02	0.02
SH⁺N_J = 1₂−0₁F = 3/2−3/2	0.14 ± 0.02	10.34 ± 0.24	3.00²	0.04 ± 0.01	0.02
SH⁺N_J = 1₁−0₁F = 3/2−1/2	≤0.18			≤0.15³
SH⁺N_J = 1₁−0₁F = 1/2−1/2	≤0.11			≤0.09³
SH⁺N_J = 1₁−0₁F = 3/2−3/2	≤0.13			≤0.12³
SH⁺N_J = 1₁−0₁F = 1/2−3/2	≤0.11			≤0.09³

CF⁺ 5–4	0.20 ± 0.02	11.13 ± 0.11	1.96 ± 0.21	0.10 ± 0.01	0.02
CF⁺ 6–5	≤0.08			≤0.08³

¹³CF⁺ 5–4	≤0.05			≤0.05³

Notes. The CH⁺J = 3−2, 4−3, 5−4, and 6−5 transitions are spectrally unresolved from PACS. The parameters from HIFI are based on the average spectrum of H- and V-polarizations, unless otherwise specified.

⁽¹⁾

Based on V-polarization data only.

⁽²⁾

Fixed parameter in the fit.

⁽³⁾

3 × rms noise level.

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