Note: this is an archived version which has been superseded.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

G39.7−2.0

W50, SS433

• Right Ascension: 19 12 20
• Declination: +04 55
• Size (/arcmin): 120×60
• Type: ?
• Flux density at 1 GHz (/Jy): 85?
• Spectral Index: 0.7?

Notes: Eastern part has been called G40.0−3.1. Is this a SNR?

Radio: Elongated shell, containing SS433, adjacent to the HII region S74.

Optical: Faint filaments at the edge of the radio emission.

X-ray: Emission from SS433 and two lobes.

Point sources: SS433 is the compact source in the centre of the W50.

Distance: HI absorption indicates 6.0±0.5 kpc.

References:

• van den Bergh 1980, ApJ, 236, L23. Optical in Hα and [SII]. ADS
• Zealey et al. 1980, MNRAS, 192, 731. Optical spectra. ADS
• van Gorkom et al. 1982, MNRAS, 198, 757. WSRT HI absorption to nearby point source (not SS433). ADS
• Seaquist & Gilmore 1982, AJ, 87, 378. VLA observations of nearby source. ADS
• Watson et al. 1983, ApJ, 273, 688. X-ray observations. ADS
• Downes et al. 1986, MNRAS, 218, 393. Effelsberg 100-m at 4.75 GHz (2.'4: S=34±4 Jy), plus previous 1.7 and 2.7 GHz data. ADS
• Romney et al. 1987, ApJ, 321, 822. VLBI of SS433, including distance. ADS
• Elston & Baum 1987, AJ, 94, 1633. Mosaic with VLA at 1.4 GHz (30'') of fine structure only. ADS
• Kawai et al. 1989, PASJ, 41, 491. X-ray observations of SS433. ADS
• Band 1989, ApJ, 336, 937. Einstein and EXOSAT observations. ADS
• Yamauchi et al. 1994, PASJ, 46, L109. X-ray spectral observations. ADS
• Biggs & Lyne 1996, MNRAS, 282, 691. Pulsar search. ADS
• Brinkmann et al. 1996, A&A, 312, 306. ROSAT observations. ADS
• Kotani et al. 1996, PASJ, 48, 619. X-ray line emission from SS433. ADS
• Safi-Harb & Ögelman 1997, ApJ, 483, 868. ROSAT observations. ADS
• Dubner et al. 1998, AJ, 116, 1842. VLA at 328 MHz (64''×60'': S=160±20 Jy), and 1.4 GHz (56''×54''), plus NRAO 140-ft at 1.4 GHz (21') for HI observations. ADS
• Safi-Harb & Petre 1999, ApJ, 512, 784. X-ray observations. ADS
• Aharonian et al. 2001, A&A, 375, 1008. Limit on high energy γ-rays. ADS
• Brinkmann et al. 2007, A&A, 463, 611. XMM-Newton observations of E lobe. ADS
• Boumis et al. 2007, MNRAS, 381, 308. Optical observations. ADS
• Lockman et al. 2007, MNRAS, 381, 881. HI observations. ADS
• Gao et al. 2011, A&A, 529, A159. Urumqi 25-m at 5 GHz (9.'5: S=37±4 Jy), including polarisation and review of flux densities. ADS

Last updated: 30 May 2014

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