Table 3: ortho- ${\rm H}_{2}{\rm D}^{+}$column densities.
Source n(${\rm H}_2$) $T_{\rm kin}$ Ref.a N(${\rm H}_2$)b Ref. $T_{\rm ex}$c $\tau$c N(ortho- ${\rm H}_{2}{\rm D}^{+}$)c
name ( ${{\rm cm}}^{-3}$) (K)   (1022 ${\rm cm}^{-2}$)   (K)   (1013 ${\rm cm}^{-2}$)
Starless Cores
L 1498 1 $\times $ 105 10 4 3.2 7 7.5, 5.5 <0.3, <0.9 <0.7, <2
TMC-2 3 $\times $ 105 10d 7 6.0 7 8.7, 5.9 <0.2, <0.6 <0.5, <1.5
TMC-1C 1 $\times $ 106 7 8, 9 8.5 9 6.8, 6.0 0.4, 0.6 0.9, 1.4
L 1517B 2 $\times $ 105 9.5 4 3.7 7 8.0, 5.6 0.2, 0.9 0.4, 1.8
L 1544 2 $\times $ 106 7 21 13 7i 6.9, 6.5 1.2, 1.7 3.2, 4.5
L 183 2 $\times $ 106 7 12, 22 14 12 6.9, 6.5 1.1, 1.6 2.5, 3.5
Oph D 5 $\times $ 105 7 23 11 23 6.7, 5.8 0.8, 2.0 1.6, 4.0
B 68e 3 $\times $ 105 10 24, 13 1.4 7 8.7, 5.9 0.1, 0.3 0.2, 0.5
L 429 6 $\times $ 105 7d 7 12 7i 6.8, 6.3 1.1, 1.8 4.1, 6.7
L 694-2 9 $\times $ 105 7d 7 11 7i 6.9, 6.3 1.1, 2.0 3.2, 5.7
16293Ef 2 $\times $ 106 12 19 50 19 12, 10 0.5, 0.7 1.2, 1.7
Protostellar Cores
NGC 1333 DCO+ 1 $\times $ 106d 13 1 31 14 12, 8.7 0.03, 0.1 0.35, 0.59
B 1 3 $\times $ 106 12 2, 3 21 15 12, 10 0.1, 0.1 0.9, 1.1
IRAM 04191 5 $\times $ 105 10 5 17 16 9.2, 6.8 <0.3, <0.6 <0.8, <1.5
L 1521F 1 $\times $ 106 9.3 6, 20 14 7 8.9, 7.3 0.2, 0.4 0.7, 1.1
Ori B9g 7 $\times $ 104 10 10 4.0 10 6.8, 4.2 0.1, 0.4 0.2, 0.9
NGC 2264G-VLA2 8 $\times $ 105 15 11 10 17 14, 9.2 0.1, 0.2 0.3, 0.5
NGC 1333 IRAS 4Ah 2 $\times $ 106 13 18 31 18 13, 10 0.03, 0.04 0.2, 0.3
a When more than one reference is listed, the first number refers to the source paper for the volume density and the second number refers to the source paper for the kinetic temperature. In the case of L 183, both parameters can be found in the two listed papers.
b Values of N(${\rm H}_2$) have been estimated assuming a constant gas temperature of 10 K along the line of sight, except for those objects with central temperatures of 7 K (see item ``i'' below).
c The first value is calculated assuming a critical density $n_{\rm cr}$ = 105  ${{\rm cm}}^{-3}$, whereas the second value is for $n_{\rm cr}$ = 106  ${{\rm cm}}^{-3}$.
d Assumed value.
e Ortho- ${\rm H}_{2}{\rm D}^{+}$ data from Hogerheijde et al. (2006), but method described in the text.
f Ortho- ${\rm H}_{2}{\rm D}^{+}$data from Vastel et al. (2004), but method described in the text.
g Estimates of $T_{\rm ex}$, $\tau$ and N(ortho- ${\rm H}_{2}{\rm D}^{+}$) based on APEX data from Harju et al. (2006), but using the method described in the text.
h Data from Stark et al. (1999), but method described in the text.
i The value of N(${\rm H}_2$) given by Crapsi et al. (2005) has been modified to take into account the temperature gradient (see Sect. 4.1 for details).
References: (1) Hatchell (2003); (2) Lis et al. (2006); (3) Marcelino et al. (2005); (4) Tafalla et al. (2004); (5) Belloche & André (2004); (6) Crapsi et al. (2004); (7) Crapsi et al. (2005), in a 11 $^{\prime\prime}$ beam; (8) Schnee & Goodman (2005); (9) Schnee et al. (2007b); (10) Harju et al. (1993), in a 40 $^{\prime\prime}$ beam; (11) Girart et al. (2000); (12) Pagani et al. (2004); (13) Hotzel et al. (2002); (14) van der Tak et al. (2002), in a 13 $^{\prime\prime}$ beam; (15) Hatchell et al. (2005), in a 14 $^{\prime\prime}$ beam; (16) Belloche et al. (2002), in a 11 $^{\prime\prime}$ beam; (17) Gomez et al. (1994), within 20 $^{\prime\prime}$; (18) Stark et al. (1999) (N(${\rm H}_2$) measured in a 13 $^{\prime\prime}$ beam); (19) Vastel et al. (2004) (N(${\rm H}_2$) measured in a 13 $^{\prime\prime}$ beam using Lis et al. 2002a data); (20) Kirk et al. (2007); (21) Crapsi et al. (2007); (22) Pagani et al. (2007); (23) Stamatellos et al. (2007); (24) Bergin et al. (2006).

Source LaTeX | All tables | In the text