Table 2 Analysis of astronomical data.

From: A search for varying fundamental constants using hertz-level frequency measurements of cold CH molecules

Source

Transition 1

Transition 2

v (km s−1)

Δ v12 (km s−1)

Δ v′12 (km s−1)

(10−7)

(10−7)

Ref.

G111.7−2.1(CasA)

CH(3264, 3335, 3349)

OH(1667)

−1.4, 0

−0.01 (0.09)

−0.08 (0.11)

1.5 (2.0)

−3.1 (4.1)

30,32

G265.1+1.5(RCW36)

CH(3264, 3335)

OH(1612, 1665, 1667, 1721)

6.8

0.06 (0.19)

0.04 (0.16)

0.9 (3.1)

1.9 (6.4)

34

G174.3−13.4(Heiles2)

CH(3264, 3335, 3349)

OH(1612, 1665, 1667, 1721)

5.8

0.00 (0.19)

−0.02 (0.19)

0.6 (3.6)

−1.2 (7.4)

32,43

G6.0+36.7(L134N)

CH(3264, 3335, 3349)

OH(1665, 1667)

2.5

0.05 (0.13)

−0.12 (0.13)

2.3 (2.4)

−4.8 (5.0)

32,43

G49.5−0.4(W51)

CH(702)

CH(3264, 3335, 3349)

65

−0.85 (0.53)

−0.48 (0.55)

−1.8 (2.0)

3.6 (4.1)

36

  1. The columns are: the direction of the source, the transitions used (labelled by the frequencies of the hyperfine components in MHz), the velocity component(s) used, the measured velocity difference, the velocity difference corrected for any differences between the nominal and laboratory frequencies, the derived values of Δα/α and Δμ/μ, the references where the spectra are given. 1σ uncertainties are given in parentheses.
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