G31.9+0.0     3C391

• Right Ascension: 18 49 25
• Declination: −00 55
• Size (/arcmin): 7×5
• Type: S
• Flux density at 1 GHz (/Jy): 25
• Spectral Index: varies

Radio: Shell, brightest in NW, with low frequency turnover.

X-ray: Diffuse with central core.

Distance: HI absorption is seen to the tangent point (8.5 kpc).

References:

• Radhakrishnan et al. 1972, ApJS, 24, 49. HI absorption. ADS
• Becker & Kundu 1975, AJ, 80, 679. NRAO 140-ft at 10.6 GHz (3'). ADS
• Green et al. 1975, A&A, 44, 187. Effelsberg 100-m at 15 GHz (58'': S>1.6). ADS
• Becker & Kundu 1976, ApJ, 204, 427. NRAO interferometer at 2.7 GHz (20''×23'') and 8 GHz (24''×9''), plus review of flux densities. ADS
• Altenhoff et al. 1979, A&AS, 35, 23. Effelsberg 100-m at 4.9 GHz (2'.6). ADS
• Goss et al. 1979, A&A, 78, 75. FIRST at 1.4 GHz (54''×66'': S=20±2 Jy) and Effelsberg 100-m at 10.7 GHz (77'': S=7.5±0.8 Jy). ADS
• Wang & Seward 1984, ApJ, 279, 705. Einstein observations. ADS
• Kassim 1992, AJ, 103, 943. VLA at 327 MHz (3'.4×3'.7: S=44.8 Jy). ADS
• Reynolds & Moffett 1993, AJ, 105, 2226. VLA at 1.4 GHz (6''), including possible associated CO. ADS
• Moffett & Reynolds 1994, ApJ, 425, 668. VLA at 330 MHz (smoothed to 30'': S=38.5±0.5 Jy) 1.46 GHz (6".7) and 4.85 GHz (6".2×6".4), including spectral index and polarisation studies. ADS
• Frail et al. 1996, AJ, 111, 1651. OH emission near remnant, including masers. ADS
• Gorham et al. 1996, ApJ, 458, 257. Pulsar search. ADS
• Reach & Rho 1996, A&A, 315, L277. ISO spectroscopy. ADS
• Rho & Petre 1996, ApJ, 467, 698. ROSAT observations. ADS
• Wilner et al. 1998, AJ, 115, 247. CO observations of surroundings. ADS
• Reach & Rho 1998, ApJ, 507, L93. ISO observations. ADS
• Reach & Rho 1999, ApJ, 511, 836. CO, HCO⁺ and CS observations of surroundings. ADS
• Reach & Rho 2000, ApJ, 544, 843. ISO observations of interactions with surroundings. ADS
   also see: Reach & Rho 2001, ApJ, 558, 943. Erratum. ADS
• Sugizaki et al. 2001, ApJS, 134, 77. ASCA survey observations. ADS
• Chen & Slane 2001, ApJ, 563, 202. ASCA observations. ADS
• Reach et al. 2002, ApJ, 564, 302. Observations of shocked molecular species. ADS
• Chen et al. 2004, ApJ, 616, 885. Chandra observations. ADS
• Brogan et al. 2005, AJ, 130, 148. VLA at 74 MHz, 330 MHz and 1.5 GHz (70''). ADS
• Kawasaki et al. 2005, ApJ, 631, 935. ASCA observations. ADS
• Reach et al. 2006, AJ, 131, 1479. Spitzer observations. ADS
• Neufeld et al. 2007, ApJ, 664, 890. Spitzer observations. ADS
• Hewitt et al. 2008, ApJ, 683, 189. GBT at 1.6 and 1.7 GHz for OH masers. ADS
• Castro & Slane 2010, ApJ, 717, 372. Fermi observations. ADS
• Yuan & Neufeld 2011, ApJ, 726, 76. Spitzer observations. ADS
• Sun et al. 2011, A&A, 536, A83. Urumqi 25-m at 5 GHz (9'.5: S=8.9±0.6 Jy) including polarisation and review of flux densities. ADS

Last updated: 23 May 2014