G49.2−0.7     (W51)

• Right Ascension: 19 23 50
• Declination: +14 06
• Size (/arcmin): 30
• Type: S?
• Flux density at 1 GHz (/Jy): 160?
• Spectral Index: 0.3?

Radio: In complex region, parameters uncertain.

Optical: Some diffuse emission possibly associated.

X-ray: Elongated east–west.

Distance: Association with CO gives 6 kpc. HI suggest 4.3 kpc.

References:

• Shaver & Goss 1970, AuJPA, 14, 133. Parkes 64-m at 5 GHz (4'). ADS
• Sato 1973, PASJ, 25, 135. HI absorption. ADS
• Velusamy & Kundu 1974, A&A, 32, 375. NRAO 300-ft at 2.7 GHz (5'), S=51.5±3.2 Jy, for the non-thermal component, but probably confused. 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
• Copetti & Schmidt 1991, MNRAS, 250, 127. 151 MHz observations. ADS
• Kassim 1992, AJ, 103, 943. VLA at 327 MHz (3'.1×3'.5). ADS
• Subrahmanyan & Goss 1995, MNRAS, 275, 755. VLA at 330 MHz (1'.1). ADS
• Koo et al. 1995, ApJ, 447, 211. ROSAT observations. ADS
• Frail et al. 1996, AJ, 111, 1651. OH emission near remnant. ADS
• Gorham et al. 1996, ApJ, 458, 257. Pulsar search. ADS
• Green et al. 1997, AJ, 114, 2058. OH masers. ADS
• Koo & Moon 1997, ApJ, 475, 194. Arecibo (3') and VLA (40''×42'') at 1.4 GHz for HI. ADS
• Koo & Moon 1997, ApJ, 485, 263. NRAO 12-m CO and HCO⁺ observations. ADS
• Brogan et al. 2000, ApJ, 537, 875. VLA at 1.7 GHz for OH Zeeman splitting. ADS
• Mavromatakis et al. 2001, A&A, 370, 265. Optical observations. ADS
• Koo et al. 2002, AJ, 123, 1629. ASCA observations. ADS
• Koo et al. 2005, ApJ, 633, 946. Chandra observations. ADS
• Kang & Koo 2007, ApJS, 173, 85. SGPS of high velocity HI. ADS
• Hewitt et al. 2008, ApJ, 683, 189. GBT at 1.6 and 1.7 GHz for OH masers. ADS
• Abdo et al. 2009, ApJ, 706, L1. Fermi observations. ADS
• Koo et al. 2010, AJ, 140, 262. HI Zeeman splitting observations. ADS
• Ceccarelli et al. 2011, ApJ, 740, L4. Molecular line observations of region. ADS
• Aleksić et al. 2012, A&A, 541, A13. γ-ray observations. ADS
• Hanabata et al. 2013, PASJ, 65, 42. Suzaku observations. ADS
• Tian & Leahy 2013, ApJ, 769, L17. HI observations of region. ADS
• Brogan et al. 2013, ApJ, 771, 91. VLA at 74 MHz (84''×92'') and 320 MHz (33''×35''), plus OH, molecular line and other observations. ADS
• Park et al. 2013, ApJ, 777, 14. Arecibo of HI in region. ADS

Last updated: 30 May 2014