A spatially resolved radio spectral study of the galaxy M 51

Open Access

Table 2

Observation parameters for the nine radio maps used in the analysis.

Telescope (Survey)	Central frequency (MHz)	Beam size	σ rms noise (μJy)	Convolved σ_c rms noise (μJy)	Flux uncertainty ϵ_ν (%)	Reference
LOFAR (LoLSS)	54	$15_{\cdot}^{''} 0 \times 15_{\cdot}^{''} 0$ $\[15^{\prime \prime}_\cdot0 \times 15^{\prime \prime}_\cdot0\]$	1500	1500	10	1
LOFAR (LoTSS)	144	$6_{\cdot}^{''} 0 \times 6_{\cdot}^{''} 0$ $\[6^{\prime \prime}_\cdot0 \times 6^{\prime \prime}_\cdot0\]$	45	100	10	2
GMRT	240	$14_{\cdot}^{''} 0 \times 12_{\cdot}^{''} 2$ $\[14^{\prime \prime}_\cdot0 \times 12^{\prime \prime}_\cdot2\]$	500	850	10	3
GMRT	333	$15_{\cdot}^{''} 0 \times 15_{\cdot}^{''} 0$ $\[15^{\prime \prime}_\cdot0 \times 15^{\prime \prime}_\cdot0\]$	200	350	10	4
GMRT ^(a)	619	$5_{\cdot}^{''} 7 \times 4_{\cdot}^{''} 6$ $\[5^{\prime \prime}_\cdot7 \times 4^{\prime \prime}_\cdot6\]$	27	125	10	5
WSRT (SINGS)	1370	$17_{\cdot}^{''} 5 \times 12_{\cdot}^{''} 5$ $\[17^{\prime \prime}_\cdot5 \times 12^{\prime \prime}_\cdot5\]$	22	25	5	6
WSRT (SINGS)	1699	$13_{\cdot}^{''} 5 \times 10_{\cdot}^{''} 0$ $\[13^{\prime \prime}_\cdot5 \times 10^{\prime \prime}_\cdot0\]$	27	30	5	6
VLA + Effelsberg	4850	$15_{\cdot}^{''} 0 \times 15_{\cdot}^{''} 0$ $\[15^{\prime \prime}_\cdot0 \times 15^{\prime \prime}_\cdot0\]$	30	30	5	7
VLA + Effelsberg	8350	$15_{\cdot}^{''} 0 \times 15_{\cdot}^{''} 0$ $\[15^{\prime \prime}_\cdot0 \times 15^{\prime \prime}_\cdot0\]$	20	20	5	7

Notes. ^(a)Map not used in the analysis due to possible deconvolution errors.

References. (1) de Gasperin et al. (2021); (2) Shimwell et al. (2022); (3) This work; (4) Mulcahy et al. (2016); (5) Farnes et al. (2013); (6) Braun et al. (2007); (7) Fletcher et al. (2011).

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