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 B.1.

Integrated flux density of M 101 from the literature and our observations.

			Background
Frequency	Flux density [Jy]	Instrument	sources	Beam size	Reference
[MHz]		type	removed
54^(a)	5.02 ± 0.51	Interferometer	+	$26 \overset{″}{.} 5 \times 20 ″$ $26{{\overset{\prime\prime}{.}}}5 \times 20{{\prime\prime}}$	1
57	6.5 ± 2.5	Interferometer	-	7′×6′	2
144^(a)	3.18 ± 0.32	Interferometer	+	$26 \overset{″}{.} 5 \times 20 ″$ $26{{\overset{\prime\prime}{.}}}5 \times 20{{\prime\prime}}$	3
178	2.4 ± 0.5	Interferometer	-	23′×18′	4
610	1.4 ± 0.1	Interferometer	+	1′×1′12″	5
750	1.3 ± 0.3	Single dish	-	18′30″ × 18′30″	6
920	1.3 ± 0.2	Transit	-	∼8′ in E-W direction	7
1370^(a)	0.537 ± 0.027	Interferometer	+	$15 \overset{″}{.} 1 \times 11 \overset{″}{.} 0$ $15{{\overset{\prime\prime}{.}}}1\times 11{{\overset{\prime\prime}{.}}}0$	1
1400	0.75 ± 0.04	Interferometer	-	45″ × 45″	8
1400	0.81 ± 0.10	Single dish	-	11′40″ × 11′40″	9
1400	0.8 ± 0.1	Interferometer	-	4′×4′	10
1410	0.82 ± 0.21	Single dish	-	10′×10′	6
1415	0.85 ± 0.13	Interferometer	-	4′×30′	11
2700	0.52 ± 0.06	Single dish	+	∼4′30″ × 4′30″	12
2700	0.48 ± 0.03	Single dish	+	4′24″ × 4′24″	13
4750	0.335 ± 0.020	Single dish	+	2′27″ × 2′27″	12
4850	0.31 ± 0.02	Single dish	+	2′30″ × 2′30″	13
4850^(a)	0.308 ± 0.015	Combined	+	30″ × 30″	14
10700	0.207 ± 0.020	Single dish	+	1′30″ × 1′30″	12

References. (1) This paper; (2) Israel & Mahoney (1990); (3) Shimwell et al. (2022); (4) Caswell & Wills (1967); (5) Israel et al. (1975); (6) de Jong (1965); (7) Kuril’Chik (1966); (8) Condon et al. (2002); (9) White & Becker (1992); (10) Rogstad & Shostak (1971); (11) de La Beaujardière et al. (1968); (12) Graeve et al. (1990); (13) Berkhuijsen et al. (2016); (14) Weżgowiec et al. (2022);

^(a)

Map used in this work.

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