G22.7-0.2

Radio: Non-thermal ring in complex region, overlapping G23.3−0.3.
X-ray: Possible detection.
Point sources: Variable radio source near centre, and γ-ray source near edge.
Distance: Association with CO indicates 4.4 kpc, HI absorption suggests 4.7 kpc, optical extinction suggests 4.7 kpc.

References:

Shaver & Goss 1970, AuJPA, 14, 133. Molonglo at 408 MHz (3') and Parkes 64-m at 5 GHz (4'). ADS
Altenhoff et al. 1979, A&AS, 35, 23. Effelsberg 100-m at 4.9 GHz (2.'6). ADS
Kassim 1992, AJ, 103, 943. VLA at 327 MHz (3.'3×3.'4: S=82 Jy). ADS
Green et al. 1997, AJ, 114, 2058. Parkes 64-m OH observations. ADS
Reach et al. 2006, AJ, 131, 1479. Spitzer observations. ADS
Becker et al. 2010, AJ, 140, 157. Variable radio source detection. ADS
Andersen et al. 2011, ApJ, 742, 7. Spitzer observations. ADS
Su et al. 2014, ApJ, 796, 122. CO observations. ADS
Su et al. 2015, ApJ, 811, 134. CO observations of region. ADS
H.E.S.S. Collaboration: Abramowski et al. 2015, MNRAS, 446, 1163. H.E.S.S. observations. ADS
Mori et al. 2017, ApJ, 848, 80. NuSTAR, Chandra and XMM-Newton observations. ADS
Ranasinghe & Leahy 2018, AJ, 155, 204. VGPS HI absorption observations. ADS
Hogge et al. 2019, ApJ, 887, 79. Molecular line observations. ADS
Tam et al. 2020, ApJ, 899, 75. Fermi observations of region. ADS
Wang et al. 2020, A&A, 639, A72. Optical extinction for distance. ADS
Dokara et al. 2021, A&A, 651, A86. VLA at 4 to 8 GHz (18'': S=0.7 Jy) including polarisation, and Spitzer observations. ADS
Sofue et al. 2021, ApJS, 253, 17. Nobeyama 45-m CO observations (20'') of region. ADS

Last updated: 20 Dec 2022

Dave Green / Cambridge, UK /