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Table A.1

Transitions of recombination lines.

Transition Rest frequency υ lsr Δυ S ν σ
(MHz) (Jy km s-1) (km s-1) (km s-1) (Jy) (Jy) Notes

Hα

H71α 17 992.6 72.67 ± 0.05 − 5.4 ± 0.1 23.8 ± 0.1 2.870 ± 0.007 0.006
H70α 18 769.2 76.19 ± 0.07 − 4.4 ± 0.1 23.8 ± 0.1 3.000 ± 0.009 0.006
H69α 19 591.1 70.67 ± 0.04 − 3.4 ± 0.1 23.8 ± 0.1 2.800 ± 0.005 0.005
H68α 20 461.8 73.24 ± 0.13 − 3.6 ± 0.1 23.3 ± 0.1 2.960 ± 0.019 0.008 1
H67α 21 384.8 96.27 ± 0.11 − 5.1 ± 0.1 23.7 ± 0.1 3.820 ± 0.017 0.014 2
H66α 22 364.2 92.61 ± 0.07 − 4.9 ± 0.1 24.4 ± 0.1 3.560 ± 0.010 0.011
H65α 23 404.3 < 64.39 0.009 b
H64α 24 509.9 62.25 ± 0.02 − 3.6 ± 0.1 23.5 ± 0.1 2.480 ± 0.004 0.004
H63α 25 686.3 57.00 ± 0.03 − 2.6 ± 0.1 23.3 ± 0.1 2.300 ± 0.005 0.005

Heα

He71α 17 999.9 6.32 ± 0.05 − 6.0 ± 0.1 15.4 ± 0.2 0.386 ± 0.007 0.005
He70α 18 776.8 6.27 ± 0.05 − 4.9 ± 0.1 15.2 ± 0.1 0.388 ± 0.008 0.007
He69α 19 599.1 5.84 ± 0.04 − 3.9 ± 0.1 15.2 ± 0.1 0.361 ± 0.006 0.005
He68α 20 470.1 6.70 ± 0.07 − 4.0 ± 0.1 15.6 ± 0.2 0.405 ± 0.011 0.008
He67α 21 393.5 8.13 ± 0.09 − 5.3 ± 0.1 14.8 ± 0.2 0.515 ± 0.015 0.016
He66α 22 373.3 7.52 ± 0.06 − 4.7 ± 0.1 15.5 ± 0.1 0.455 ± 0.010 0.010
He65α 23 413.8 < 12.96 0.005 b
He64α 24 519.9 5.37 ± 0.02 − 4.1 ± 0.1 15.2 ± 0.1 0.333 ± 0.004 0.003
He63α 25 696.7 < 21.85 0.005 b

Cα

C71α 18 001.5 0.40 ± 0.03 6.7 ± 0.1 4.9 ± 0.4 0.077 ± 0.007 0.006 t
C70α 18 778.5 0.30 ± 0.02 8.1 ± 0.1 4.0 ± 0.3 0.070 ± 0.006 0.006 t
C69α 19 600.9 0.30 ± 0.02 8.8 ± 0.2 5.8 ± 0.5 0.048 ± 0.005 0.005 t
C68α 20 472.0 0.51 ± 0.12 7.6 ± 0.8 11.0 ± 3.6 0.044 ± 0.010 0.008 t
C67α 21 395.5 0.54 ± 0.07 7.1 ± 0.3 5.9 ± 0.7 0.085 ± 0.015 0.016 t
C66α 22 375.3 0.39 ± 0.04 7.6 ± 0.2 5.8 ± 0.6 0.063 ± 0.009 0.007 t
C65α 23 416.0 0.17 ± 0.04 8.0 ± 0.3 3.5 ± 0.8 0.047 ± 0.013 0.005 t
C64α 24 522.1 0.27 ± 0.02 8.1 ± 0.1 4.7 ± 0.3 0.054 ± 0.005 0.004 t
C63α 25 699.1 0.20 ± 0.02 9.2 ± 0.2 4.3 ± 0.4 0.045 ± 0.006 0.004 t

Hβ

H89β 18 045.9 18.73 ± 0.07 − 5.2 ± 0.1 24.0 ± 0.1 0.734 ± 0.008 0.007
H88β 18 661.1 19.98 ± 0.04 − 4.5 ± 0.1 24.0 ± 0.1 0.782 ± 0.006 0.006
H87β 19 304.7 21.95 ± 0.05 − 3.1 ± 0.1 23.8 ± 0.1 0.867 ± 0.007 0.007
H86β 19 978.2 24.25 ± 0.10 − 2.6 ± 0.1 24.8 ± 0.1 0.920 ± 0.013 0.013
H85β 20 683.3 20.49 ± 0.06 − 3.1 ± 0.1 23.8 ± 0.1 0.809 ± 0.008 0.009
H84β 21 422.1 < 28.64 0.026 b
H83β 22 196.5 23.00 ± 0.10 − 3.5 ± 0.1 23.1 ± 0.1 0.934 ± 0.015 0.014
H82β 23 008.6 16.32 ± 0.03 − 4.2 ± 0.1 23.5 ± 0.1 0.653 ± 0.005 0.005
H81β 23 860.9 17.94 ± 0.03 − 3.1 ± 0.1 23.5 ± 0.1 0.716 ± 0.005 0.005
H80β 24 755.7 16.88 ± 0.03 − 3.9 ± 0.1 23.5 ± 0.1 0.674 ± 0.005 0.005
H79β 25 695.9 < 22.09 0.007 b

Heβ

He89β 18 053.2 1.56 ± 0.04 − 5.8 ± 0.2 14.7 ± 0.5 0.099 ± 0.006 0.005
He88β 18 668.7 1.79 ± 0.05 − 4.8 ± 0.2 15.7 ± 0.4 0.107 ± 0.005 0.005
He87β 19 312.6 2.06 ± 0.04 − 4.1 ± 0.2 16.3 ± 0.4 0.119 ± 0.007 0.006
He86β 19 986.3 2.37 ± 0.11 − 2.7 ± 0.3 15.6 ± 1.0 0.142 ± 0.015 0.013
He85β 20 691.8 1.79 ± 0.05 − 3.4 ± 0.2 16.1 ± 0.5 0.105 ± 0.009 0.008
He84β 21 430.8 1.87 ± 0.09 − 5.7 ± 0.3 11.0 ± 0.6 0.160 ± 0.022 0.020 3
He83β 22 205.5 2.29 ± 0.08 − 4.3 ± 0.2 15.9 ± 0.6 0.135 ± 0.013 0.013
He82β 23 018.0 1.44 ± 0.03 − 4.3 ± 0.1 14.9 ± 0.3 0.090 ± 0.005 0.005
He81β 23 870.6 < 2.77 0.006 b
He80β 24 765.8 1.61 ± 0.03 − 4.6 ± 0.1 16.7 ± 0.3 0.090 ± 0.005 0.004
He79β 25 706.4 < 105.14 0.005 b

Hγ

H101γ 18 327.5 10.12 ± 0.05 − 4.6 ± 0.1 25.5 ± 0.2 0.373 ± 0.007 0.005
H100γ 18 874.8 10.49 ± 0.04 − 3.9 ± 0.1 24.5 ± 0.1 0.402 ± 0.006 0.006
H99γ 19 444.0 9.64 ± 0.04 − 3.7 ± 0.1 24.6 ± 0.1 0.368 ± 0.005 0.005
H98γ 20 036.3 10.82 ± 0.09 − 1.5 ± 0.1 25.3 ± 0.2 0.402 ± 0.012 0.009
H97γ 20 653.0 9.16 ± 0.06 − 3.2 ± 0.1 23.9 ± 0.2 0.361 ± 0.008 0.007
H96γ 21 295.2 12.35 ± 0.07 − 4.4 ± 0.1 24.6 ± 0.2 0.472 ± 0.011 0.011
H95γ 21 964.3 11.18 ± 0.09 − 4.0 ± 0.1 24.2 ± 0.2 0.434 ± 0.014 0.014
H94γ 22 661.8 11.17 ± 0.05 − 3.9 ± 0.1 25.1 ± 0.1 0.417 ± 0.008 0.008
H93γ 23 389.1 8.50 ± 0.05 − 3.9 ± 0.1 24.2 ± 0.2 0.330 ± 0.007 0.004 4
H92γ 24 147.9 7.63 ± 0.02 − 3.5 ± 0.1 24.0 ± 0.1 0.299 ± 0.003 0.003
H91γ 24 939.8 7.62 ± 0.02 − 3.7 ± 0.1 23.4 ± 0.1 0.305 ± 0.004 0.004
H90γ 25 766.8 < 10.64 0.004 b

Heγ

He101γ 18 335.0 0.92 ± 0.04 − 5.2 ± 0.3 15.6 ± 0.9 0.055 ± 0.006 0.005
He100γ 18 882.4 1.02 ± 0.04 − 5.4 ± 0.3 17.6 ± 0.8 0.055 ± 0.006 0.006
He99γ 19 451.9 0.92 ± 0.03 − 4.7 ± 0.3 17.9 ± 0.7 0.048 ± 0.005 0.005
He98γ 20 044.5 1.06 ± 0.08 − 3.4 ± 0.5 15.3 ± 1.4 0.065 ± 0.012 0.011
He96γ 21 303.9 1.03 ± 0.07 − 4.7 ± 0.5 15.4 ± 1.3 0.063 ± 0.012 0.010
He95γ 21 973.3 0.99 ± 0.08 − 4.0 ± 0.5 14.0 ± 1.6 0.066 ± 0.014 0.014
He94γ 22 671.0 0.88 ± 0.04 − 5.3 ± 0.4 16.5 ± 0.9 0.050 ± 0.008 0.008
He93γ 23 398.6 < 0.47 0.005 b
He92γ 24 157.7 0.67 ± 0.02 − 4.2 ± 0.2 16.9 ± 0.5 0.037 ± 0.003 0.003
He91γ 24 950.0 0.77 ± 0.04 − 4.0 ± 0.3 17.7 ± 1.1 0.041 ± 0.004 0.004
He90γ 25 777.3 0.53 ± 0.03 − 2.8 ± 0.3 13.0 ± 0.8 0.038 ± 0.006 0.005

Hδ

H111δ 18 241.7 4.58 ± 0.06 − 4.5 ± 0.2 26.8 ± 0.4 0.160 ± 0.006 0.006
H110δ 18 734.9 5.48 ± 0.05 − 4.3 ± 0.1 25.5 ± 0.3 0.202 ± 0.006 0.005
H109δ 19 246.1 6.80 ± 0.05 − 2.8 ± 0.1 26.7 ± 0.2 0.239 ± 0.005 0.006
H108δ 19 776.0 < 9.51 0.012 b
H107δ 20 325.5 5.52 ± 0.06 − 3.7 ± 0.1 25.5 ± 0.4 0.204 ± 0.007 0.007
H106δ 20 895.6 4.99 ± 0.07 − 3.1 ± 0.2 24.8 ± 0.4 0.189 ± 0.009 0.009
H105δ 21 487.2 7.34 ± 0.13 − 5.1 ± 0.2 26.9 ± 0.6 0.256 ± 0.013 0.014
H104δ 22 101.4 7.00 ± 0.12 − 3.7 ± 0.2 24.6 ± 0.5 0.267 ± 0.015 0.014
H103δ 22 739.2 3.63 ± 0.05 − 4.7 ± 0.2 23.4 ± 0.4 0.145 ± 0.007 0.006
H102δ 23 401.8 < 69.10 0.005 b
H101δ 24 090.4 4.19 ± 0.03 − 3.7 ± 0.1 24.2 ± 0.2 0.163 ± 0.003 0.003
H100δ 24 806.3 4.38 ± 0.03 − 3.7 ± 0.1 23.7 ± 0.2 0.174 ± 0.005 0.005
H99δ 25 550.8 4.08 ± 0.03 − 3.3 ± 0.1 24.0 ± 0.2 0.160 ± 0.004 0.004

Heδ

He110δ 18 742.5 0.64 ± 0.04 − 4.0 ± 0.4 17.3 ± 1.2 0.035 ± 0.005 0.005
He107δ 20 333.8 < 3.60 0.009 b
He103δ 22 748.5 0.33 ± 0.03 − 5.0 ± 0.6 13.7 ± 1.5 0.023 ± 0.006 0.006
He102δ 23 411.4 < 12.96 0.005 b
He101δ 24 100.2 0.37 ± 0.02 − 5.2 ± 0.3 15.7 ± 0.9 0.022 ± 0.003 0.003
He100δ 24 816.4 0.35 ± 0.02 − 5.0 ± 0.5 16.1 ± 1.4 0.020 ± 0.004 0.004
He99δ 25 561.2 0.38 ± 0.02 − 5.0 ± 0.5 16.4 ± 1.3 0.022 ± 0.004 0.004

Hε

H120ε 17 901.6 3.38 ± 0.08 − 6.5 ± 0.3 29.0 ± 0.8 0.110 ± 0.006 0.006
H119ε 18 347.5 3.64 ± 0.07 − 5.1 ± 0.2 27.3 ± 0.6 0.125 ± 0.006 0.006
H118ε 18 808.4 < 5.84 0.005 b
H117ε 19 284.8 < 7.25 0.005 b
H116ε 19 777.4 < 9.29 0.012 b
H115ε 20 287.0 2.83 ± 0.06 − 3.6 ± 0.2 23.9 ± 0.6 0.111 ± 0.007 0.007
H114ε 20 814.3 3.20 ± 0.08 − 3.8 ± 0.3 26.3 ± 0.8 0.114 ± 0.009 0.009
H113ε 21 359.9 4.25 ± 0.14 − 6.0 ± 0.4 23.9 ± 1.0 0.167 ± 0.015 0.016
H112ε 21 924.8 4.31 ± 0.11 − 3.4 ± 0.3 25.5 ± 0.8 0.159 ± 0.013 0.013
H111ε 22 509.8 2.91 ± 0.06 − 4.1 ± 0.2 25.6 ± 0.6 0.107 ± 0.007 0.007
H110ε 23 115.9 2.71 ± 0.03 − 4.4 ± 0.2 25.1 ± 0.4 0.101 ± 0.005 0.005
H109ε 23 743.8 2.92 ± 0.04 − 3.1 ± 0.2 24.4 ± 0.4 0.112 ± 0.006 0.006
H108ε 24 394.8 2.78 ± 0.03 − 3.4 ± 0.1 24.3 ± 0.3 0.107 ± 0.004 0.004
H107ε 25 069.7 2.45 ± 0.04 − 4.1 ± 0.2 23.5 ± 0.4 0.098 ± 0.005 0.005
H106ε 25 769.8 < 10.82 0.004 b

Heε

He107ε 25 079.9 < 1.43 0.005 b

Hζ

H127ζ 17 978.5 2.01 ± 0.05 − 6.5 ± 0.3 24.2 ± 0.7 0.078 ± 0.005 0.004
H126ζ 18 400.1 < 8.62 0.006 b
H125ζ 18 835.1 2.54 ± 0.07 − 3.4 ± 0.3 27.8 ± 0.9 0.086 ± 0.005 0.006
H124ζ 19 283.8 < 7.25 0.008 b
H122ζ 20 225.1 2.12 ± 0.06 − 3.2 ± 0.3 23.6 ± 0.9 0.084 ± 0.007 0.006
H121ζ 20 718.7 < 5.26 0.009 b
H120ζ 21 228.6 < 3.75 0.006 b
H118ζ 22 299.6 2.67 ± 0.11 − 4.8 ± 0.4 25.3 ± 1.3 0.099 ± 0.011 0.012
H117ζ 22 862.3 2.16 ± 0.07 − 4.2 ± 0.3 27.0 ± 1.1 0.075 ± 0.006 0.006
H116ζ 23 444.0 < 8.09 0.005 b
H115ζ 24 045.6 2.21 ± 0.04 − 2.3 ± 0.2 26.0 ± 0.6 0.080 ± 0.004 0.004
H114ζ 24 668.0 1.79 ± 0.03 − 4.0 ± 0.2 24.9 ± 0.6 0.068 ± 0.004 0.004
H113ζ 25 312.0 2.05 ± 0.04 − 3.5 ± 0.2 24.8 ± 0.7 0.078 ± 0.005 0.005
H112ζ 25 978.7 2.24 ± 0.06 − 3.0 ± 0.3 24.0 ± 0.7 0.088 ± 0.009 0.009

Hη

H133η 18 123.4 1.38 ± 0.09 − 5.3 ± 0.7 27.9 ± 2.3 0.047 ± 0.007 0.007
H132η 18 528.0 1.81 ± 0.08 − 5.3 ± 0.5 30.0 ± 1.7 0.057 ± 0.006 0.006
H131η 18 944.7 1.71 ± 0.08 − 4.9 ± 0.5 28.9 ± 1.6 0.056 ± 0.006 0.006
H130η 19 374.0 1.60 ± 0.06 − 3.5 ± 0.4 26.5 ± 1.2 0.057 ± 0.005 0.005
H129η 19 816.4 1.83 ± 0.21 − 1.6 ± 1.2 30.3 ± 4.5 0.057 ± 0.014 0.014
H128η 20 272.4 1.16 ± 0.09 − 6.1 ± 0.9 28.9 ± 3.0 0.038 ± 0.007 0.007
H126η 21 227.2 < 3.74 0.007 b
H123η 22 775.1 1.02 ± 0.03 − 4.7 ± 0.3 23.0 ± 0.9 0.042 ± 0.004 0.004
H122η 23 324.4 < 2.12 0.006 b
H121η 23 891.6 1.40 ± 0.04 − 3.3 ± 0.3 24.1 ± 0.9 0.055 ± 0.005 0.005
H120η 24 477.3 1.25 ± 0.03 − 3.4 ± 0.3 23.7 ± 0.8 0.050 ± 0.004 0.004
H119η 25 082.3 < 1.65 0.005 b
H118η 25 707.4 < 2.75 0.005 b

Hθ

H139θ 18 019.0 1.46 ± 0.12 − 8.4 ± 1.0 31.5 ± 3.1 0.044 ± 0.006 0.006
H138θ 18 402.8 < 6.80 0.008 b
H135θ 19 621.6 2.02 ± 0.06 − 3.8 ± 0.3 31.0 ± 1.2 0.061 ± 0.004 0.004
H134θ 20 051.7 2.77 ± 0.36 − 6.7 ± 1.7 41.6 ± 6.4 0.063 ± 0.013 0.013 5
H133θ 20 494.5 < 3.82 0.006 b
H132θ 20 950.5 1.27 ± 0.15 − 0.7 ± 1.4 35.3 ± 5.3 0.034 ± 0.008 0.008 5
H131θ 21 420.0 < 29.45 0.051 b
H130θ 21 903.8 0.97 ± 0.10 − 3.4 ± 0.9 18.5 ± 2.2 0.049 ± 0.015 0.015 5
H129θ 22 402.1 1.27 ± 0.06 − 3.4 ± 0.5 26.7 ± 1.6 0.045 ± 0.006 0.006
H128θ 22 915.8 0.97 ± 0.05 − 5.1 ± 0.5 24.7 ± 1.6 0.037 ± 0.006 0.006
H127θ 23 445.2 < 8.11 0.005 b
H126θ 23 991.2 1.06 ± 0.03 − 3.6 ± 0.2 28.2 ± 1.0 0.035 ± 0.003 0.003
H124θ 25 134.9 1.10 ± 0.04 − 4.0 ± 0.4 28.1 ± 1.3 0.037 ± 0.004 0.004
H123θ 25 734.1 0.85 ± 0.04 − 1.9 ± 0.6 23.4 ± 1.6 0.034 ± 0.006 0.006

Hι

H142ι 18 859.0 0.62 ± 0.04 − 7.2 ± 0.7 21.9 ± 1.9 0.026 ± 0.005 0.005
H140ι 19 654.0 0.96 ± 0.09 − 6.6 ± 1.2 35.1 ± 4.2 0.026 ± 0.005 0.005
H138ι 20 494.3 < 3.37 0.008 b
H137ι 20 932.5 0.83 ± 0.09 0.3 ± 1.2 27.0 ± 4.0 0.029 ± 0.009 0.009 5
H136ι 21 383.2 < 97.36 0.014 b
H134ι 22 324.4 1.02 ± 0.07 − 5.4 ± 0.7 27.8 ± 2.4 0.034 ± 0.006 0.006
H133ι 22 815.7 0.98 ± 0.10 − 8.4 ± 1.2 32.0 ± 3.8 0.029 ± 0.006 0.006
H132ι 23 321.6 1.00 ± 0.08 0.006 b
H131ι 23 842.5 0.97 ± 0.06 − 3.6 ± 0.6 28.2 ± 2.2 0.033 ± 0.005 0.005
H130ι 24 379.1 0.67 ± 0.03 − 2.5 ± 0.4 24.0 ± 1.2 0.026 ± 0.004 0.004
H129ι 24 931.9 < 63.73 0.050 b
H128ι 25 501.5 0.68 ± 0.03 − 4.4 ± 0.5 23.6 ± 1.3 0.027 ± 0.004 0.004

Hκ

H136κ 23 518.2 1.14 ± 0.05 − 5.1 ± 0.8 35.0 ± 2.0 0.031 ± 0.004 0.004 5
H132κ 25 642.8 0.50 ± 0.04 − 3.0 ± 0.6 28.4 ± 2.5 0.017 ± 0.006 0.004

Hλ

H136λ 25 609.7 0.72 ± 0.03 − 2.8 ± 0.6 31.2 ± 1.3 0.022 ± 0.006 0.004 5

Notes. – (1) Although H68α is blended with HDO (32,1 − 41,4) (see Fig. B.16), the integrated intensity of HDO (32,1 − 41,4) can be ignored compared with H68α. (2) Although H67α is blended with H136ι (see Fig. B.10), the integrated intensity of H136ι can be neglected. (3) Note that the observed line width is narrower than those of other He RRL transitions. (4) Although H93γ is blended with CH3OCH3 (123,10 − 114,7) (see Fig. B.16), the integrated intensity of CH3OCH3 (123,10 − 114,7) can be ignored compared with H93γ. (5) Note that the fitted parameters are possibly wrong due to low signal-to-noise ratios. (b) It indicates that this line is blended (see Table 2). (t) The fit for the Cα line is tentative because it is blended.

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