The low-frequency flattening of the radio spectrum of giant H II regions in M 101

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Volume 695 (March 2025)

A&A, 695 (2025) A41

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Table 2.

Observation parameters for the radio maps used in the analysis.

					Convolved	Flux
			Beam	Original σ	regridded	density
Telescope	Central	Beam size	position	rms noise	σ_c rms	scale	Ref.
(Survey)	frequency		angle PA	[μJy beam⁻¹]	noise	uncertainty
	[MHz]		[°]		[μJy beam⁻¹]	ϵ_ν [%]
LOFAR (LoLSS)	54	$26 \overset{″}{.} 5 \times 14 \overset{″}{.} 7$ $26{{\overset{\prime\prime}{.}}}5\times 14{{\overset{\prime\prime}{.}}}7$	114.8	1700	1700	10	1
LOFAR (LoTSS)	144	$20 \overset{″}{.} 0 \times 20 \overset{″}{.} 0$ $20{{\overset{\prime\prime}{.}}}0 \times 20{{\overset{\prime\prime}{.}}}0$	/	130	170	10	2
Apertif	1370	$15 \overset{″}{.} 1 \times 11 \overset{″}{.} 0$ $15{{\overset{\prime\prime}{.}}}1\times 11{{\overset{\prime\prime}{.}}}0$	1.4	20	30	5	3
VLA + Effelsberg	4850	$30 \overset{″}{.} 0 \times 30 \overset{″}{.} 0$ $30{{\overset{\prime\prime}{.}}}0\times 30{{\overset{\prime\prime}{.}}}0$	/	59	59	5	4

Notes. (1) Observed by de Gasperin et al. (2021), reprocessed in this paper; (2) Shimwell et al. (2022); (3) This work; (4) Weżgowiec et al. (2022).

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