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

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Table 1.

Basic properties of M 101.

Name	M 101
Alternative names	NGC 5457
RA (J2000)	14^h03^m12 $\overset{s}{.}$ $\overset{\text{ s}}{.}$ 5
Dec (J2000)	+54°20′56″
Morphology	SAB(rs)cd ^(a)
Apparent size	40′ ^(b)
Distance	6.644 ± 0.087 Mpc ^(c)
Position angle	36°^(d)
Inclination angle	26°^(d)
Scaling	1″ ↔ 32.21 pc

Notes.

^(a)

de Vaucouleurs et al. (1991)

^(b)

Vorontsov-Vel’Yaminov & Arkhipova (1962)

^(c)

Hiramatsu et al. (2023)

^(d)

Hu et al. (2018).

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