Submillimeter absorption from SH+, a new widespread interstellar radical, 13CH+ and HCl

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Volume 525 (January 2011)

A&A, 525 (2011) A77

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Table 1

Spectroscopic data and beam-averaged continuum brightness temperature assumed for the LTE modeling of the absorption lines toward Sgr B2(M).

Transition	F′−F′′^a	Position^b	Frequency	S	E _l	F _eff ^c	B _eff ^d	T _cont ^e	Reference^f
		(″,″)	(MHz)		(K)			(K)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)

c-C₃H₂2₁₂–1₀₁		2.6,–2.0	85338	.893(14)	1.50	0.0^g	0.95	0.78	5.9	JPL, ^h
H¹³CO⁺ 1–0		2.6,–2.0	86754	.2884(46)	1.0	0.0	0.95	0.78	5.9	CDMS, ⁱ
CO 1–0		2.6,–2.0	115271	.2018(5)	1.0	0.0	0.95	0.74	5.9	CDMS, ^j
CO 3–2		2.6,–2.0	345795	.9899(5)	3.0	16.6	0.95	0.72	11.0	CDMS, ^j
SH⁺ 1₀–0₁	0.5−0.5	0,0	345843	.591(128)	0.2289	0.0	0.95	0.72	11.0	CDMS, −
	0.5−1.5		345929	.810(75)	0.5780	0.0				CDMS, ^k
H³⁷Cl 1–0	1.5−1.5	0,0	624964	.374(100)	1.3333	0.0	0.95	0.41	33.8	JPL, ^l
	2.5−1.5		624977	.821(100)	2.0	0.0				JPL, ^l
	0.5−1.5		624988	.334(100)	0.6667	0.0				JPL, ^l
H³⁵Cl 1–0	1.5−1.5	0,0	625901	.603(100)	1.3333	0.0	0.95	0.41	33.8	JPL, ^l
	2.5−1.5		625918	.756(100)	2.0	0.0				JPL, ^l
	0.5−1.5		625932	.007(100)	0.6667	0.0				JPL, ^l
SH⁺ 1₁–0₁	1.5−0.5	0,0	683336	.08(51)	0.1890	0.0	0.95	0.41	30.0	CDMS, ^m
	0.5−0.5		683361	.98(48)	0.3778	0.0				CDMS, −
	1.5−1.5		683422	.31(50)	0.9441	0.0				CDMS, ^m
	0.5−1.5		683448	.20(50)	0.1887	0.0				CDMS, ^m
¹³CH⁺ 1–0		0,0	830 216	.096(22)	1.0	0.0	0.95	0.35	47.7	CDMS, ⁿ
SH⁺ 2₁–1₁	0.5−0.5	0,0	893047	.60(95)	0.2889	32.8	0.95	0.35	43.5	CDMS, −
	0.5−1.5		893073	.49(96)	0.1445	32.8				CDMS, −
	1.5−0.5		893107	.92(105)	0.1444	32.8				CDMS, −
	1.5−1.5		893133	.81(94)	0.7225	32.8				CDMS, −

Notes.

^(a)

Hyperfine quantum numbers as far as appropriate.

^(b)

Equatorial offset (J2000) with respect to Sgr B2(M). (0, 0) corresponds to (α,δ)_J2000 = 17^h47^m20^s.2,−28°23′05′′.

^(c)

Forward efficiency.

^(d)

Main-beam efficiency.

^(e)

The beam-averaged continuum brightness temperature was derived from the depth of the saturated absorption lines in the 3 mm wavelength range, and from a direct measurement of the baseline level at higher frequency.

^(f)

Catalog used for rest frequency and reference for line measurement, see also Sect. 2.

^(g)

Lower level is ortho ground state; it is 2.35 K above the zero level.

^(h)

Vrtilek et al. (1987).

⁽ⁱ⁾

Schmid-Burgk et al. (2004).

^(j)

Winnewisser et al. (1997).

^(k)

Savage et al. (2004).

^(l)

De Lucia et al. (1971).

^(m)

Hovde & Saykally (1987); Brown & Müller (2009).

⁽ⁿ⁾

Amano (2010).

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