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

 

 

Table 2:

Fitted column density, excitation temperature, line width and position per component (see Sect. 3.1).

Species 		Component $N({\rm X})$ $T_{\rm ex}$ $\Delta v$ $v_{\rm lsr}$ $N({\rm X})/N_{\rm H}$
    [cm-2] [K] [km s-1] [km s-1]  

CH 		CENTER 4.0(14) 6.6 4.4 -5.9 4(-9)b
CH+   8.5(12) 38.4 7.0 -4.6 9(-11)b
CH RED 2.6(14) ...a 1.8 -0.2 2(-8)c
CH+   1.2(14) ... 15.0 1.6 1(-8)c
H2O+   8.3(12) ... 4.5 2.2 7(-10)c
OH+   6.1(13) ... 5.1 2.8 5(-9)c
NH 974 GHz   1.5(13) ... 1.5 -0.2 1(-9)c
NH 999 GHz   1.5(13) ... 1.5 -0.1 1(-9)c

CH+ 		BLUE 1.8(14) 8.0 6.0 -17.1 4(-9)d
H2O+   5.4(12) ... 13.5 -16.4 1(-10)d
OH+   1.6(13) ... 12.4 -16.1 3(-10)d
NH 974 GHz   1.9(13) ... 5.7 -12.4 4(-10)d
NH 999 GHz   3.8(13) ... 4.0 -10.4 8(-10)d

Notes. Fractional abundances are given relative to $N_{\rm H} = N({\rm H}) + 2 N({\rm H}_2)$. $A(B) \equiv A \times 10^B$.
(a) Fixed at 3 K; (b) using $N_{\rm H} \sim 10^{23}$ cm-2, see text; (c) using $N_{\rm H} \sim 1.2 \times 10^{22}$ cm-2 (Minh & Yang 2008); (d) using $N_{\rm H} \sim 4.6 \times 10^{22}$ cm-2 (Mitchell et al. 1989).


Source LaTeX | All tables | In the text

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