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Table 1

Summary of observed ζ and Z in the literature.

Reference Comments p ζ Z
Heyer & Brunt (2007) 12CO J = 1–0, 1 0.49 ± 0.15
Perseus and solar neighborhood

Heyer & Dame (2015) 12CO and 13CO J = 1–0, 30 MCs 1 0.24 ± 0.00
12CO and 13CO J = 1–0, Taurus 1 0.26 ± 0.00

Miesch & Bally (1994) 13CO J = 1–0, 1 0.43 ± 0.15
12 clouds and subregions of GMCs 2 0.86 ± 0.30

Padoan et al. (2003) 13CO J = 1–0, Perseus 1 0.50 ± 0.00 0.42 ± 0.00
2 0.83 ± 0.00 0.72 ± 0.00
3 1.18 ± 0.00 1.00 ± 0.00
13CO J = 1–0, Taurus 1 0.46 ± 0.00 0.42 ± 0.00
2 0.77 ± 0.00 0.72 ± 0.00
3 1.10 ± 0.00 1.00 ± 0.00

Padoan et al. (2006) 13CO J = 1–0, Perseus 2 0.80 ± 0.10

Roman-Duval et al. (2011) 13CO J = 1–0, 367 clouds from the GRS survey 1 0.50 ± 0.30

Zernickel (2015) 13CO J = 1–0, NGC 6334 1 0.38 ± 0.00
2 0.76 ± 0.01
13CO J = 1–0, NGC 6334, ≤ 4 pc 1 0.48 ± 0.01
2 0.79 ± 0.01

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