Note: this is an archived version which has been superseded. The current SNR catalogue is at http://www.mrao.cam.ac.uk/surveys/snrs/

G21.8−0.6

Kes 69

• Right Ascension: 18 32 45
• Declination: −10 08
• Size (/arcmin): 20
• Type: S
• Flux density at 1 GHz (/Jy): 65
• Spectral Index: 0.56

Radio: Incomplete shell.

X-ray: Detected.

Distance: Association with CO indicates 5.2 kpc, and HI absorption suggests 5.6 kpc.

References:

• Shaver & Goss 1970, AuJPA, 14, 133. Molonglo at 408 MHz (3') and Parkes 64-m at 5 GHz (4'). ADS
• Wilson 1972, A&A, 19, 354. H₂CO absorption. ADS
• Kundu et al. 1974, AJ, 79, 132. NRAO 140-ft at 5 GHz (6') and 10 GHz (3'). ADS
• Velusamy & Kundu 1974, A&A, 32, 375. NRAO 300-ft et 2.7 GHz (5': S=42.3±4.6 Jy). ADS
• Dickel & Milne 1976, AuJPh, 29, 435. Comparison of earlier Parkes 64-m maps at 2.7 GHz (8.'4) and 5 GHz (4.'4). ADS
• Altenhoff et al. 1979, A&AS, 35, 23. Effelsberg 100-m at 4.9 GHz (2.'6). ADS
• Seward 1990, ApJS, 73, 781. Einstein observations. ADS
• Kassim 1992, AJ, 103, 943. VLA at 327 MHz (3.'3×3.'5: S=132 Jy). ADS
• Green et al. 1997, AJ, 114, 2058. Parkes 64-m OH observations, including masers. ADS
• Yusef-Zadeh et al. 2003, ApJ, 585, 319. X-ray observations. ADS
• Reach et al. 2006, AJ, 131, 1479. Spitzer observations. ADS
• Hewitt et al. 2008, ApJ, 683, 189. GBT at 1.6 and 1.7 GHz for OH masers. ADS
• Wood et al. 2008, AJ, 135, 2358. VLA at 4.8 GHz, including polarisation. ADS
• Tian & Leahy 2008, MNRAS, 391, L54. VGPS at 1.4 GHz (1') including HI. ADS
• Zhou et al. 2009, ApJ, 691, 516. CO and HCO⁺ of region. ADS
• Hewitt et al. 2009, ApJ, 694, 1266. Spitzer spectroscopy. ADS
• Sun et al. 2011, A&A, 536, A83. Urumqi 25-m at 5 GHz (9.'5: S=24.0±1.3 Jy) including polarisation and review of flux densities. ADS
• Andersen et al. 2011, ApJ, 742, 7. Spitzer observations. ADS
• Pihlström et al. 2014, AJ, 147, 73. VLA search for methanol masers. ADS
• Froebrich et al. 2015, MNRAS, 454, 2586. H₂ IR observations. ADS
• Ranasinghe & Leahy 2018, AJ, 155, 204. VGPS HI absorption observations. ADS
• Sezer et al. 2018, MNRAS, 481, 1416. Suzaku observations. ADS

Last updated: 9 Apr 2019

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