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Table 1

SMGPS parameters compared to previous radio continuum surveys covering the Galactic plane in the frequency range 0.8–6.0 GHz.

Survey Instr. l Coverage (deg) b Coverage (deg) Quadrant Freq. (GHz) Bandwidth (MHz) FWHM (arcsec) rms (µJy/beam) LAS (arcmin) Ref.
2 < l < 60 |b| < 1.5 I
SMGPS MeerKAT 252< l <358 |b| < 1.5 III, IV 1.284 792 8 30 27 1

18 < l < 46 |b| < 1.3
VGPS VLA+GBT 46 < l < 59 |b| < 1.9 I 1.4 1.866 60 (a) (b) 2
59 < l < 67 |b| < 2.3

0 < l < 49.5 |b| < 1.0 I
MAGPIS (6 cm) VLA 350<l<360 |b| < 0.4 IV 5.0 50 6 179 3

VLA+Effelsberg 5 < l < 48.5 |b| < 0.8 I 1.4 95 6 897 (c) 4

MAGPIS (21 cm) −20< l < 120 |b| < 0.8 I, IV
VLA −10< l <40 |b| < 1.7 I, IV 1.4 -(d) 6 897 3
100< l < 105 |b| < 2.2° I

CORNISH VLA 10< l <65 |b| < 1.1 I 5.0 25 1.5 400 2 5

CORNISH-South ATCA 295 < l < 350 |b| <1 IV 5.5 2000 2.5 110 6

−2° < 1 < 60°, −1° < b < 1°
GLOSTAR VLA+Effelsberg 76° < 1 <83°, −1° < b < 2° I 5.8 18 150 4 7

MGPS MOST 245 < l < 365 |b| < 10 III, IV 0.843 3 45×45 csc|δ| 1000 25 8

SGPS ATCA + Parkes 253 < l < 358 |b| < 1.5 III, IV 14 128 132 <1000 (f) 9
5< l <20 |b| < 1.5 I 198

CGPS DRAO Synth. Tel. 74.2 < l < 147.3 −3.6 < b < 5.6 I, II 1.42 35 60×60 csc|δ| 300 40 10

18.1×11.1 to
THOR VLA 14 < l < 67.4 |b| < 1.25 I 1.42 128 12.0×11.6 300–1000 2 11

Notes. (a)Noise level ~0.3 K.(b)Without Green Bank Telescope data, the quoted LAS of VLA D-configuration is ~16 arcmin. (c)Without Effelsberg data, the quoted LAS of VLA D-configuration is ~16 arcmin. (d) Bandwidth variable across different observations, from 40 to 200 MHz. (e)Final mosaic obtained by integrating 8 sub-band images formed from two 1-GHz wide bands centred at 4.7 and 6.9 GHz. (f)Without Parkes data, the theoretical LAS of ATCA smallest baseline configuration is ~23 arcmin. References: (1) Goedhart et al. (2024); (2) Stil et al. (2006); (3) White et al. (2005); (4) Helfand et al. (2006); (5) Hoare et al. (2012); (6) Irabor et al. (2023); (7) Brunthaler et al. (2021); (8) Murphy et al. (2007); (9) McClure-Griffiths et al. (2005); (10) Taylor et al. (2003); (11) Beuther et al. (2016).

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