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Table 1

List of observed IRDCs.

Name RA Dec distancea Tc N(H2)d categorye
(J2000.0) (J2000.0) (kpc) (K)  × 1022 cm-2
IRDC308.13-1 13 37 01.582  −62 44 34.01 4.8 13.5 1.0 Q
IRDC308.13-2 13 37 00.418  −62 43 41.01 4.0 13.5 1.0 M
IRDC308.13-3 13 37 02.163  −62 43 39.01 4.0 13.5 1.0 M
IRDC309.13-1 13 45 17.521  −62 22 02.84 3.9 16.3 0.6 M
IRDC309.13-2 13 45 22.610  −62 23 27.48 3.9 14.7 0.5 M
IRDC309.13-3 13 45 16.775  −62 25 37.25 3.9 35.4 0.4 A
IRDC309.37-1 13 48 38.532  −62 46 17.55 3.4 31.4 0.9 A
IRDC309.37-2 13 47 56.116  −62 48 33.46 3.4 15.7 0.8 A
IRDC309.37-3 13 48 39.383  −62 47 22.39 3.4 15.7 0.7 Q
IRDC310.39-1 13 56 01.359  −62 14 18.29 4.2 27.4 1.2 A
IRDC310.39-2 13 56 00.759  −62 13 59.80 4.2 27.4 1.2 A
IRDC312.36-1 14 11 27.752  −61 29 27.18 4.5 13.5 1.1 A
IRDC312.36-2 14 11 56.773  −61 29 25.78 4.0 14.4 0.3 Q
IRDC313.72-1 14 22 53.158  −61 14 41.00 3.3 19.9 0.4 A
IRDC313.72-2 14 22 57.151  −61 14 10.84 3.3 19.9 0.4 A
IRDC313.72-3 14 23 02.720  −61 13 39.64 3.3 19.9 0.3 Q
IRDC313.72-4 14 23 04.533  −61 14 46.00 3.3 19.9 0.4 Q
IRDC316.72-1 14 44 19.000  −59 44 29.00 2.7 26.1 1.2 M
IRDC316.76-1 14 44 56.000  −59 48 08.00 2.7 22.6 4.1 A
IRDC316.72-2 14 44 15.400  −59 43 20.00 2.7 24.3 1.3 Q
IRDC316.76-2 14 45 00.500  −59 48 44.00 2.8 23.2 4.8 A
IRDC317.71-1 14 51 06.905  −59 16 11.03 3.0 15.6 1.2 Q
IRDC317.71-2 14 51 10.975  −59 17 01.73 3.0 16.6 3.5 A
IRDC317.71-3 14 51 19.667  −59 17 43.77 3.2 15.6 0.6 Q
IRDC320.27-1 15 07 56.251  −57 54 32.11 2.1 15.3 0.8 Q
IRDC320.27-2 15 07 31.616  −57 53 27.24 2.2 16.1 0.5 Q
IRDC320.27-3 15 07 35.077  −57 54 13.98 2.1 16.1 0.4 Q
IRDC321.73-1 15 18 26.387  −57 22 00.14 2.2 22.0 1.0 M
IRDC321.73-2 15 18 01.693  −57 22 02.00 2.2 11.7 1.7 M
IRDC321.73-3 15 18 01.065  −57 21 24.48 2.1 11.7 1.7 A
IRDC013.90-1 18 17 33.378  −17 06 36.70 2.5 12.9 2.6 M
IRDC013.90-2 18 17 19.350  −17 09 23.69 2.4 13.4 1.1 Q
IRDC316.45-1 14 44 51.515  −60 30 55.00 3.1 15.4 0.7 M
IRDC316.45-2 14 44 47.095  −60 31 30.89 3.1 14.2 0.5 M
IRDC318.15-1 14 55 57.704  −59 29 04.12 3.0 17.6 0.5 M
IRDC318.15-2 14 55 58.334  −59 28 30.52 2.9 17.6 0.4 Q
IRDC309.94-1 13 50 54.970  −61 44 21.00 5.3b 48.8 5.2 A

Notes. Columns are name, right ascension, declination, distance, kinetic temperature, H2 column density and type according to mid-IR classification.

(a)

At first, to estimate the kinematic distances to our IRDCs, we used HCO+ line velocities (see Vasyunina et al. 2009). But more detailed investigation showed that HCO+ lines, as a rule, have complex line shapes and the vLSR positions can be shifted up to 2 km s-1 in comparison with its optically thin isotopologue H13CO+. We cannot use H13CO+ for distance determination, since it is much weaker and we detected it not in all cases. Thus, we decided to use N2H+ for the distance determination, which is distinguishable for all regions except IRDC309.37-2. Despite the significant difference in velocities (up to 2 km s-1) between HCO+ and N2H+, the kinematic distances did not change drastically compared with the values in Paper I.

(c)

Temperatures were derived based on (1, 1) and (2, 2) ammonia transitions observed with the the 64-m Parkes radio telescope (Linz et al., in prep.).

(d)

To estimate H2 column densities in every point we used 1.2 mm data from SIMBA/SEST adopting the Mopra telescope beam size.

(e)

“A” indicates “active” cores, “M” – “middle”, “Q” – “quiescent”.

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