G321.9-0.3

• Right Ascension: 15 20 40
• Declination: -57 34
• Size (/arcmin): 31×23
• Type: S
• Flux density at 1 GHz (/Jy): 13
• Spectral Index: 0.3

Radio: Shell brighter to the W, with Cir X-1 to N.

Point sources: Compact, probably thermal source at S edge.

References:

• Clark et al. 1975, AuJPA, 37, 1. Molonglo at 408 MHz (3': S=18.3 Jy) and Parkes 64-m at 5 GHz (4': S=7.8 Jy). ADS
• Kesteven & Caswell 1987, A&A, 183, 118. MOST at 843 MHz (44"×52"). ADS
• Stewart et al. 1993, MNRAS, 261, 593. ATCA at 1.5 GHz (21"). ADS
• Whiteoak & Green 1996, A&AS, 118, 329. MOST at 843 MHz (43"×51": S>8.3). ADS
• Green et al. 1997, AJ, 114, 2058. Parkes 64-m OH observations. ADS
• Mignami et al. 2002, A&A, 386, 487. HST proper motion study of Cir X-1. ADS

Last updated: 7 Jan 2004