Table 1
Observed IRDCs.
| Source | RA(J2000) | Dec(J2000) | Gal. longitude | Gal. latitude | Distance | Beam | Minimum | Minimum |
| size | N2H+ | N2H+ | ||||||
| detection | detection0.4 km s-1 | |||||||
| name | [hh mm ss.s] | [dd:mm:ss] | [°] | [°] | [kpc] | [pc] | × 1012 cm-2 | × 1012 cm-2 |
|
|
||||||||
| Observed with Nobeyama 45m | ||||||||
| IRDC 18223 | 18 25 10.7 | −12 45 12 | 18.613 | −0.081 | 3.5 | 0.3 | 0.8 | |
| IRDC 18310 | 18 33 44.7 | −08 22 36 | 23.467 | 0.085 | 4.9 | 0.4 | 3.9 | |
| IRDC 18385 | 18 41 17.1 | −05 09 15 | 27.189 | −0.098 | 3.1 | 0.3 | 1.2 | |
| IRDC 18454 | 18 47 58.1 | −01 54 41 | 30.835 | −0.100 | 5.3 | 0.5 | 4.1 | |
| ISOSS J20153 | 20 15 21.4 | +34 53 52 | 72.953 | −0.027 | 1.2 | 0.1 | 8.1 | |
| IRDC 13.90 | 18 17 26.1 | −17 05 26 | 13.906 | −0.473 | 2.6 | 0.2 | 1.4 | |
|
|
||||||||
| Observed with Mopra | ||||||||
| IRDC 18102 | 18 13 12.2 | −17 59 34 | 12.632 | −0.016 | 2.6 | 0.6 | 5.7 | 3.3 |
| IRDC 18151 | 18 17 55.3 | −12 07 29 | 18.335 | 1.778 | 2.7 | 0.6 | 3.9 | 2.8 |
| IRDC 18182 | 18 21 12.2 | −14 32 46 | 16.577 | −0.069 | 3.4 | 0.7 | 3.2 | 2.2 |
| IRDC 18306 | 18 33 29.9 | −08 32 07 | 23.298 | 0.066 | 3.6 | 0.8 | 1.5 | 1.6 |
| IRDC 18308 | 18 33 33.1 | −08 37 46 | 23.220 | 0.011 | 4.4 | 1.0 | 2.9 | 2.1 |
| IRDC 18337 | 18 36 29.6 | −07 40 33 | 24.402 | −0.197 | 3.7 | 0.8 | 1.8 | 1.1 |
| IRDC 19.30 | 18 25 58.1 | −12 05 09 | 19.293 | 0.060 | 2.4 | 0.5 | 7.6 | 1.3 |
| IRDC 11.11 | 18 10 20.0 | −19 25 05 | 11.056 | −0.107 | 3.4 | 0.7 | 2.4 | 1.6 |
| IRDC 15.05 | 18 17 40.4 | −15 49 12 | 15.052 | 0.080 | 3.0 | 0.7 | 3.4 | 1.4 |
| IRDC 28.34 | 18 42 48.1 | −04 01 51 | 28.361 | 0.080 | 4.5 | 1.0 | 4.5 | 3.2 |
| IRDC 48.66 | 19 21 40.7 | +13 50 32 | 48.666 | −0.263 | 2.6 | 0.6 | 2.3 | 0.8 |
Notes. Position Cols. (2−5) give the center coordinate of the maps. The actual areas that were mapped are displayed in Fig. 1 through Fig. 4. The distances are adopted from (Ragan et al. 2012a) with references therein. The detected N2H+ minimum is the minimum plotted in Figs. 1 through 4. For sources observed with MOPRA we also give the improved minimum detection when smoothing the spectra to a velocity resolution of 0.4 km s-1. Also observed with the NRO 45m telescope, but not detected, were IRDC20081, ISOSSJ19357, ISOSSJ19557, and ISOSSJ20093.
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