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Home All issues Volume 521 (October 2010) A&A, 521 (2010) L44 Full HTML

 

 

Table 1:

Observed lines in AFGL 2591.
Species/Transition/Electronic state/Line componentsf Frequency Eu $A_{\rm ul}$ $T_{\rm obs}$e $\int T {\rm d} v$ $\int \tau {\rm d} v$ $T_{\rm rms}$ $N^{\rm upper}({\rm X})$ $N^{\rm lower}({\rm X})$
        [GHz] [K] [s-1] [min] [K km s-1] [km s-1] [mK] [cm-2] [cm-2]
                         
CH JF,P=3/22,--1/21,+ $^{2}\Pi$ 3 536.7611 25.76 6.4(-4) 4.2 3.46 $\pm$ 0.04a ... 16 3.0(12) ...
CH JF,P=5/23,+-3/22,- $^{2}\Pi$ 3 1661.1074 105.48 3.8(-2) 20.2 <0.93 <0.34b,c 220 <1.3(11) <2.6(12)
CH+ J=1-0 $^{1}\Sigma^+$ 1 835.1375 40.08 6.4(-2) 40.4 $0.91\pm0.03$d $32.63\pm0.06$d 16 1.9(11)d 9.3(13)d
CH+ J=2-1 $^{1}\Sigma^+$ 1 1669.2813 120.19 6.1(-2) 40.4 $3.7\pm0.2$ ... 115 3.3(11) ...
o-H2O+ NKaKb,J=111,3/2-000,1/2 2B1 5 1115.2041 53.51 3.1(-2) 39.2 ... $7.65\pm0.05$ 33 ... 1.6(13)
o-H2O+ NKaKb,J=202,3/2-111,3/2 2B1 7 746.26 89.33 5.5(-4) 40.6 <0.16 <0.52 25 <2.6(11) <3.0(13)
OH+ NJ,F=11,3/2-01,3/2 $^{3}\Sigma^-$ 4 1033.1186 49.58 1.8(-2) 40.6 ... $21.98\pm0.06$ 32 ... 1.1(14)
OH+ NJ,F=21,3/2-11,3/2 $^{3}\Sigma^-$ 4 1892.2271 140.39 5.9(-2) 21.0 <0.83 <0.28 210 <8.2(10) <2.5(12)
NH NJ,F1,F=12,5/2,7/2-01,3/2,5/2 $^{3}\Sigma^-$ 21 974.4784 46.77 6.9(-3) 7.0 ... $3.90\pm0.09$ 43 ... 2.9(13)
NH NJ,F1,F=11,3/2,5/2-01,3/2,5/2 $^{3}\Sigma^-$ 21 999.9734 47.99 5.2(-3) 38.8 ... $3.99\pm0.05$ 29 ... 5.0(13)
NH+ JP=3/2--1/2+ $^{2}\Pi$ 5 1012.5400 48.59 5.4(-2) 38.8 <0.16 <0.19 30 <5.9(9) <1.7(10)
NH+ JP=3/2+-1/2- $^{2}\Pi$ 7 1019.2107 48.91 5.5(-2) 40.6 <0.12 <0.13 22 <4.4(9) <1.2(10)
SH+ NJ,F=12,5/2-01,3/2 $^{3}\Sigma^-$ 3 526.0479 25.25 9.6(-4) 4.2 <0.083 <0.53 11 <4.7(10) <4.5(12)

Notes. The frequency is given for the strongest fine/hyperfine component. The velocity integrated intensity or absorption is summed over all fine/hyperfine components. $A(B) \equiv A$ $\times$ 10B.
(a)  $1 \sigma \equiv \sqrt{\Delta V \delta v} T_{\rm rms}$, with $\Delta V \sim 10$ km s-1 (expected line width) and the channel width $\delta v$ (corresponding to 1.1 MHz); (b)  $1 \sigma \equiv \sqrt{\Delta V \delta v} T_{\rm rms} / T_{\rm cont}$; (c) non-detections are given by the $3 \sigma$ value; (d) emitting or absorbing part only; (e) total integration time (on+off); (f) hyperfine or fine structure.


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