Note: this is an archived version which has been superseded.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

G6.4-0.1 W28

• Right Ascension: 18 00 30
• Declination: -23 26
• Size (/arcmin): 42
• Type: C
• Flux density at 1 GHz (/Jy): 310
• Spectral Index: varies

Notes: Has been called G6.6-0.2.

Radio: Several non-thermal sources in a ring, with flat spectrum core.

Optical: Filaments.

X-ray: Diffuse emission from most of the remnant.

Point sources: Young pulsar near edge of remnant.

Distance: Uncertain mean optical velocity indicates 3.5-4 kpc.

References:

• Kundu & Velusamy 1972, A&A, 20, 237. NRAO 140-ft at 10 GHz (3').
• van den Bergh et al. 1973, ApJS, 26, 19. Optical.
• 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
• Dopita et al. 1977, ApJ, 214, 179. Some optical line ratios. ADS
• Altenhoff et al. 1979, A&AS, 35, 23. Effelsberg 100-m at 4.9 GHz (2'.6). ADS
• Lozinskaya 1981, SvAL, 7, 17. Mean optical velocity. ADS
• Andrews et al. 1983, ApJ, 266, 684. VLA at 1.4 GHz (8") 4.9 GHz (3") and 15 GHz (1") of central region only, plus HRI image of central region. ADS
• Bohigas et al. 1983, RMxAA, 8, 155. Optical spectra. ADS
• Odenwald et al. 1984, ApJ, 279, 162. Nearby IR source. ADS
• Andrews et al. 1985, AJ, 90, 310. VLA of central component. ADS
• Long et al. 1991, ApJ, 373, 567. IPC and optical observations. ADS
• Kassim 1992, AJ, 103, 943. VLA at 327 MHz (3'.1×4'.4: S=660 Jy). ADS
• Kaspi et al. 1993, ApJ, 409, L57. Pulsar association. ADS
• Frail et al. 1993, Natur, 365, 136. VLA at 327 MHz (smoothed to 65"), plus pulsar association. ADS
• Frail et al. 1994, ApJ, 424, L111. VLA of associated OH masers. ADS
• Esposito et al. 1996, ApJ, 461, 820. Possible associated gamma-ray emission. ADS
• Frail et al. 1996, AJ, 111, 1651. OH maser emission. ADS
• Biggs & Lyne 1996, MNRAS, 282, 691. Pulsar search. ADS
• Claussen et al. 1997, ApJ, 489, 143. VLA of OH masers. ADS
• Claussen et al. 1999, ApJ, 522, 349. High resolution observations of OH masers. ADS
• Yusef-Zadeh et al. 2000, ApJ, 540, 842. VLA at 327 MHz (2'.6×5'.5) and 1.48 GHz (40"×65"). ADS
• Arikawa et al. 1999, PASJ, 51, L7. Observations of shocked CO. ADS

Last updated: 23 Aug 2000