Note: this is an archived version which has been superseded.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

G54.4−0.3

(HC40)

• Right Ascension: 19 33 20
• Declination: +18 56
• Size (/arcmin): 40
• Type: S
• Flux density at 1 GHz (/Jy): 28
• Spectral Index: 0.5

Notes: Has been called G54.5−0.3.

Radio: Shell, in complex region.

Optical: Faint filaments.

Point sources: Pulsar outside NW rim.

Distance: HI and CO observations suggest 6.6 kpc.

References:

• Velusamy & Kundu 1974, A&A, 32, 375. NRAO 300-ft at 2.7 GHz (5': S=34.4±5.0 Jy). ADS
• Altenhoff et al. 1979, A&AS, 35, 23. Effelsberg 100-m at 4.9 GHz (2.'6). ADS
• Caswell 1985, AJ, 90, 1224. DRAO at 1.4 GHz (1.'3×2.'6: S=18±4 Jy). ADS
• Velusamy et al. 1986, JApA, 7, 105. WSRT at 609 MHz (50''×191'' smoothed to 100''×200''). ADS
• Junkes et al. 1992, A&AS, 96, 1. Surrounding CO. ADS
• Junkes et al. 1992, A&A, 261, 289. Nearby IRAS sources. ADS
• Boumis et al. 2005, A&A, 443, 175. Optical observations. ADS
• Reach et al. 2006, AJ, 131, 1479. Spitzer observations. ADS
• Kang & Koo 2007, ApJS, 173, 85. SGPS of high velocity HI. ADS
• Andersen et al. 2011, ApJ, 742, 7. Spitzer observations. ADS
• Park et al. 2013, ApJ, 777, 14. Arecibo of HI in region. ADS
• Froebrich et al. 2015, MNRAS, 454, 2586. H₂ IR observations. ADS
• Karpova et al. 2017, MNRAS, 466, 1757. X-ray observations of pulsar. ADS
• Ranasinghe & Leahy 2017, ApJ, 843, 119. HI and CO observations. ADS

Last updated: 9 Apr 2019

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