Detection of 15NH2D in dense cores: a new tool for measuring the 14N/15N ratio in the cold ISM

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Table 3:

Line intensities and molecular column densities.
	o-NH₂D					o-¹⁵NH₂D
Source	$T_{\rm mb} \pm \sigma~^a$	$\delta V$	$\tau$	$T_{\rm ex}$	N^b	$T_{\rm mb} \pm \sigma$ ^a	I	$\delta V$	N^b	${\left[\mbox{NH$_2$ D}\right]} \over {\left[\mbox{$^{15}$ NH$_2$ D}\right]}$
	K	km s^-1		K	10¹⁴ cm^-2	mK	mK km s^-1	km s^-1	10¹¹ cm^-2
Barnard1b	$2.5 \pm 0.047$	0.79	$5.24 \pm 0.14$	$6.0 \pm 0.5$	$4.7 \pm 0.5$	$42 \pm 9$	$30 \pm 4$	0.67	$10 \pm 2.7$	$\rm 470^{+170}_{-100}$
N1333-IRAS4A	$1.0 \pm 0.018$	1.38	$1.39 \pm 0.10$	$5.0 \pm 0.5$	$2.7 \pm 0.6$	$\pm 10$	<30	...	<10	>270
N1333-DCO⁺	$1.3 \pm 0.015$	1.15	$1.71 \pm 0.05$	$5.3 \pm 0.5$	$2.4 \pm 0.4$	$26 \pm 8$	$14 \pm 3$	0.52	$6.7 \pm 2.5$	$\rm 360^{+260}_{-110}$
LDN1544	$2.3 \pm 0.016$	0.47	$7.05 \pm 0.05$	$5.3 \pm 0.5$	$4.1 \pm 0.5$	$\pm$ 7	<10	...	<5.2	>700
L134N(S)	$2.2 \pm 0.033$	0.42	$4.75 \pm 0.10$	$5.5 \pm 0.5$	$2.4 \pm 0.4$	$24 \pm 7$	$10 \pm 2$	0.40	$4.5 \pm 2.0$	$\rm 530^{+570}_{-180}$
L1689N	$5.3 \pm 0.030$	0.53	$6.98 \pm 0.02$	$8.5 \pm 0.5$	$3.4 \pm 0.5$	$65 \pm 17$	$26 \pm 6$	0.37	$4.2 \pm 1.5$	$\rm 810^{+600}_{-250}$

^a $\sigma$ is the rms computed for the original spectral resolution of 40 kHz = 0.136 km s^-1; ^b computed at LTE with the same $T_{\rm ex}$ for o-NH₂D and o-¹⁵NH₂D. $T_{\rm ex}$ is derived from the HFS fit of the o-NH₂D profile.

Source LaTeX | All tables | In the text

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