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Home All issues Volume 500 / No 2 (June III 2009) A&A, 500 2 (2009) 845-860 Full HTML
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Table 4:

N2H+(1-0) and N2D+(2-1) line parameters derived from Hanning smoothed spectra.
Line/Position $v_{\rm LSR}$ [km s-1] $\Delta v$ [km s-1] $T_{\rm A}^*$ [K] $\int T_{\rm A}^*(v){\rm d}v$ [K km s-1] $\tau_{\rm tot}$ $T_{\rm ex}$ [K]
N$_{\bf 2}$H$^{\bf +}$(1-0)            
IRAS 05405-0117a $9.228\pm0.001$ $0.290\pm0.002$ $2.37\pm0.04$ $3.97\pm0.05$ $6.1\pm0.03$ $6.8\pm0.07$
Ori B9 Eb $9.163\pm0.002$ $0.298\pm0.005$ $1.46\pm0.04$ $2.26\pm0.03$ $3.5\pm0.5$ $6.1\pm0.3$
Ori B9 Nc $9.149\pm0.003$ $0.261\pm0.008$ $1.82\pm0.09$ $2.29\pm0.04$ $2.2\pm0.8$ $8.3\pm1.4$
N$_{\bf 2}$D$^{\bf +}$(2-1)            
IRAS 05405-0117 $9.414\pm0.012$ $0.319\pm0.027$ $0.31\pm0.04$ $0.13\pm0.01$ $0.26\pm0.01$d $6.8\pm0.07$
Ori B9 E $9.285\pm0.013$ $0.194\pm0.029$ $0.27\pm0.03$ $0.09\pm0.01$ $0.28\pm0.03^d$ $6.1\pm0.3$
Ori B9 Ne $9.255\pm0.009$ $0.136\pm0.021$ $0.28\pm0.07$ $0.09\pm0.01$ $0.16\pm0.05^d$ $8.3\pm1.4$
The integrated line intensity ( $\int T_{\rm A}^*(v){\rm d}v$) includes all the hyperfine components in the case of N2H+, whereas for N2D+ only the main group is included.
a Caselli & Myers (1994) derived $v_{\rm LSR}=9.209\pm0.003$ km s-1, $\Delta v=0.313\pm0.008$ km s-1, and $\tau_{\rm tot}=4.594\pm0.825$. b For the other velocity component hyperfine fit yields $v_{\rm LSR}=1.310\pm0.013$ km s-1, $\Delta v=0.436\pm0.035$ km s-1, and $\tau_{\rm tot}=6.6\pm2.0$. c For the other velocity component $v_{\rm LSR}=2.219\pm0.006$ km s-1, $\Delta v=0.378\pm0.021$ km s-1, $T_{\rm A}^*=0.52\pm0.03$ K, $\tau_{\rm tot}=1.0$, and $T_{\rm ex}=5.9\pm0.17$ K. d $\tau_{\rm tot}$ calculated by taking into account that the main hyperfine group corresponds to 54.3% of the total optical depth. $\tau_{\rm main ~ group}$ is calculated using $T_{\rm MB}$ from Gaussian fit to the main group and $T_{\rm ex}$ from N2H+(1-0). e For the other velocity component $v_{\rm LSR}=2.290\pm0.044$ km s-1, $\Delta v=0.187\pm0.090$ km s-1, $T_{\rm A}^*=0.22\pm0.06$ K, and $\tau_{\rm tot}=0.12\pm0.01$ ( $\tau_{\rm tot}$ is calculated as described in footnote d).

Source LaTeX | All tables | In the text

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