Note: this is an archived version which has been superseded.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

G74.9+1.2 CTB 87

• Right Ascension: 20 14 10
• Declination: +37 03
• Size (arcmin): 8×6
• Type: F
• Flux density at 1 GHz (Jy): 9
• Spectral Index: varies

Radio: Filled-centre, with high polarization and high frequency turnover.

X-ray: Centrally brightened.

Distance: HI absorption indicates 12 kpc.

Point sources: Extragalactic compact source is nearby.

References:

• Dickel & DeNoyer 1975, AJ, 80, 437. Arecibo S(430)=12.2±9.7, S(318)=17.7±5.0. ADS
• Weiler & Shaver 1978, A&A, 70, 389. WSRT at 610 MHz (57"×94": S=9.1±1.2), 1.4 (24"×40": S=8.7±1.2) and 5 GHz (24"×40": S=5.6±1.3). ADS
• Geldzahler et al. 1980, A&A, 84, 237. Effelsberg 100-m at 2.7 GHz (4'.4: S=7.6±0.5). ADS
• Wilson 1980, ApJ, 241, L19. IPC observations. ADS
• van Gorkom et al. 1982, MNRAS, 198, 757. WSRT HI absorption of nearby compact source. ADS
• Seaquist & Gilmore 1982, AJ, 87, 378. VLA observations of nearby source. ADS
• Morsi & Reich 1987, A&AS, 69, 533. Effelsberg 100-m at 32 GHz (smoothed to 40": S=1.47±0.19). ADS
• Green & Gull 1989, MNRAS, 237, 555. VLA at 1.4 GHz (1'.2×1'.4) including HI. ADS
• Salter et al. 1989, ApJ, 338, 171. NRAO 12-m at 84.2 GHz, plus review of flux densities. ADS
• Pineault & Chastenay 1990, MNRAS, 246, 169. DRAO at 408 MHz (3'.4×5'.8: S=11.6±0.4) and 1.4 GHz (1'.0×1'.7: S=7.2±0.3). ADS
• Asaoka & Koyama 1990, PASJ, 42, 625. Ginga X-ray spectrum. ADS
• Wendker et al. 1991, A&A, 241, 551. DRAO at 408 MHz (3'.5×5'.2: S=13.3±0.8) and Effelsberg 100-m at 4.8 GHz (S=7.5±0.7). ADS
• Wallace et al. 1994, A&A, 286, 565. HI of surroundings. ADS
• Cho et al. 1994, AJ, 108, 634. CO of adjacent molecular clouds. ADS

Last updated: 01 JUL 1995