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Table 1:

Column densities of nitrogen hydrides towards IRAS 16293-2422.

Species 		Transition Componenta Frequency HPBW $T_{{\rm C},mb}$b Tlc \ensuremath{\tau_{ul}} \ensuremath {T_{{\rm ex}}} FWHMd $N_{\rm tot}$
      GHz arcsec K K   K \ensuremath{{\rm km~s^{-1}}} \ensuremath{{\rm 10^{14}}}  \ensuremath {{\rm cm^{-2}}}
NHe $0_1\ensuremath{\rightarrow} 1_0$ $\frac{3}{2},\frac{5}{2}\ensuremath{\rightarrow}\frac{1}{2},\frac{3}{2}$ 946.476 23 0.8 $-3.8\pm0.6$ $2.8\pm0.7$ 9.5 0.60 $2.20\pm0.80$
o-NH2 $0_{00\frac{1}{2}}\ensuremath{\rightarrow} 1_{11\frac{3}{2}}$ $\frac{3}{2},\frac{5}{2}\ensuremath{\rightarrow}\frac{5}{2},\frac{7}{2}$ 952.578 23 0.9 $-9.0\pm0.5$ $12.8\pm0.7$ 8.5 0.60 $0.40\pm0.06$
  $0_{00\frac{1}{2}}\ensuremath{\rightarrow} 1_{11\frac{1}{2}}$ $\frac{3}{2},\frac{5}{2}\ensuremath{\rightarrow}\frac{3}{2},\frac{5}{2}$ 959.512 22 0.9 $-2.5\pm0.2$ $4.9\pm0.7$ 9.5 0.60 $0.59\pm0.12$
p- \ensuremath {{\rm NH_3}} 1 - 2 (1,-) - (1,-) 1168.453 18 1.2   300-70 8-10 0.50 200-35
o- \ensuremath {{\rm NH_3}} 1 - 2 (0,+) - (0,+) 1214.853 18 1.3   470-130 8-10 0.50 200-35
p- \ensuremath {{\rm NH_3}} 1 - 2 (1,+) - (1,+) 1215.246 18 1.3   330-80 8-10 0.50 200-35
p- \ensuremath {{\rm NH_3}} 2 - 3 (2,-) - (2,-) 1763.823 12 2.2   2.0-1.4 8-10 0.50 200-35

Notes.  (a) For NH, the quantum numbers for the rotational transition NJ are $\vec{F}_1=\vec{I}_{\rm H}+\vec{J}$ and $\vec{F}=\vec{I}_{\rm N}+\vec{F}_1$ (Klaus et al. 1997). For the NKaKcJ rotational transition of NH2, the quantum numbers are $\vec{F}_1=\vec{I}_{\rm N}+\vec{J}$ and $\vec{F}=\vec{I}_{\rm H}+\vec{F}_1$ (Müller et al. 1999). In the case of ammonia, quantum numbers are given separately for $\vec{J}=\vec{N}+\vec{S}$ and $(K,\epsilon)$, where $\epsilon$ is the symmetry index (see Maret et al. 2009). For these lines, the frequency given is that of the brightest HF component. (b) Single-sideband continuum in a \ensuremath{T_{{\rm mb}}} scale. (c)  $T_l = \ensuremath{\tau_{ul}} [J_\nu(\ensuremath{T_{{\rm ex}}} )-J_\nu(\ensuremath{T_{\rm CMB}} )-T_{{\rm C},mb}]$ from the HFS fit. In the case of ammonia, see Sect. 3. (d) A conservative uncertainty of 0.25 MHz (0.08  \ensuremath{{\rm km~s^{-1}}}) imposed by the HIPE 2.8 pipeline was retained. (e) The integrated line opacity is calculated as $\int \tau \ensuremath{~{\rm d}} v = 1.06~ FWHM \times \ensuremath{\tau_{ul}} $. (d) Bacmann et al. (2010).


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