ATLASGAL-selected massive clumps in the inner Galaxy - IV. Millimeter hydrogen recombination lines from associated H II regions

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Volume 602 (June 2017)

A&A, 602 (2017) A37

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Table 2

Frequency, absorption oscillator strength, and detection rates of observed hydrogen millimeter recombination lines.

mm-RRL	Rest frequency	Absorption	Number of	Number of	Detection rate^b
transition	(MHz)	oscillator strength^*	observed sources	detected sources^a

Hnα	−−	−	976	178	18 ± 1
H39α	106 737.4	7.725489	385	58	15 ± 2
H40α	99 023.0	7.916287	366	57	16 ± 2
H41α^†	92 034.4	8.107084	972	146^c	15 ± 1
H42α^†	85 688.4	8.297880	973	136	14 ± 1

Hnβ	−−	−	976	65	7 ± 1
H48β	111 885.1	1.342709	366	20	5 ± 1
H49β	105 301.9	1.369046	385	26	7 ± 1
H50β	99 225.2	1.395383	366	28	8 ± 1
H51β	93 607.3	1.421720	366	28	8 ± 1
H52β^†	88 405.7	1.448056	971	47	5 ± 1

Hnγ	−−	−	389	23	6 ± 1
H55γ	109 536.0	0.482179	366	17	5 ± 1
H56γ	103 914.8	0.490287	385	17	4 ± 1
H57γ	98 671.9	0.498395	366	18	5 ± 1
H58γ	93 775.9	0.506503	366	19	5 ± 1
H60γ	84 914.4	0.522718	385	15	4 ± 1

Hnδ	−−	−	389	22	6 ± 1
H60δ	110 600.7	0.230388	366	9	2 ± 1
H61δ	105 410.2	0.233881	385	9	2 ± 1
H62δ	100 539.6	0.237374	385	11	3 ± 1
H63δ	95 964.6	0.240867	366	10	3 ± 1
H64δ	91 663.1	0.244359	384	11	3 ± 1
H65δ	87 615.0	0.247852	383	7	2 ± 1

Notes. The Hnβ, Hnγ, and Hnδ mm-RRLs are only detected toward clumps where the peak intensities of Hnα mm-RRLs are brighter than 0.24, 0.62, and 0.54 Jy, respectively. Column 1 is mm-RRLs increasing transition, in Cols. 2 and 3 we give the numbers of observed and detected sources, respectively. The last column shows the detection rates. Line parameters and rms levels of the stacked and individual transitions are available in electronic form at the CDS.

^(†)

Mopra 22 m covered only these three transitions.

^(a)

A detection requires a stacked signal above 3σ.

^(b)

The statistical errors of detection rates are obtained assuming binomial statistics.

^(c)

Some H41α spectra are located at an edge or beyond observed band width.

Reference.

^(*)

Goldwire (1968), Menzel (1969).

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