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Table 2

HCO+ H2 and CO column densities.

Source v0 N(HCO +)(a) N(H2)(b) N(CO)(c) N(CO)/N(H2)
km s−1 1012 cm−2 1020 cm−2 1015 cm−2 10−6
J0942 4.5 0.64(0.02)(d) 2.35 0.37(0.11) 1.56
6.0 0.48(0.02) 1.76 1.07(0.16) 6.08
J1058 3.2 0.22(0.04) 0.74 0.04(0.01) 0.55
J1136 0.6 1.48(0.04) 4.55 0.65(0.07) 1.42
J1145 2.5 0.96(0.03) 3.19 0.18(0.03) 0.56
J1224 4.0 1.04(0.05) 3.47 1.20(0.26) 3.45
B1251 1.7 0.15(0.03) 0.51 <0.18(e) <3.66(e)
Mean(f) 3.4(1.8) 0.80(0.45) 2.68(1.35) 0.59(0.47) 2.27(2.15)
Mean(g) 3.2(1.8) 0.71(0.48) 2.37(1.48) 0.53(0.46) 2.47(2.02)

Notes. (a) N(HCO+). (b) N(H2) = N(HCO+)∕3 × 10−9. (c) N(CO). (d) Quantities in parentheses are the standard deviation. (e)Upper limits are 3σ. (f) For the six components with CO detections. (g)Including B1251 at the upper limit.

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