Note: this is an archived version which has been superseded.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 16 02
• Declination: +37 12
• Size (/arcmin): 8×6
• Type: F
• Flux density at 1 GHz (/Jy): 9
• Spectral Index: varies

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

X-ray: Centrally brightened.

Distance: HI absorption indicates 12 kpc, optical extinction gives 6.1 kpc.

Point sources: Extragalactic compact source is nearby.

References:

• Dickel & DeNoyer 1975, AJ, 80, 437. Arecibo S_430 MHz=12.2±9.7 Jy, S_318 MHz=17.7±5.0 Jy. ADS
• Weiler & Shaver 1978, A&A, 70, 389. WSRT at 610 MHz (57''×94'': S=9.1±1.2 Jy), 1.4 (24''×40'': S=8.7±1.2 Jy) and 5 GHz (24''×40'': S=5.6±1.3 Jy). ADS
• Geldzahler et al. 1980, A&A, 84, 237. Effelsberg 100-m at 2.7 GHz (4'.4: S=7.6±0.5 Jy). ADS
• Wilson 1980, ApJ, 241, L19. Einstein 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 Jy). 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 Jy) and 1.4 GHz (1'.0×1'.7: S=7.2±0.3 Jy). 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 Jy) and Effelsberg 100-m at 4.8 GHz (S=7.5±0.7 Jy). 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
• Gorham et al. 1996, ApJ, 458, 257. Pulsar search. ADS
• Biggs & Lyne 1996, MNRAS, 282, 691. Pulsar search. ADS
• Wallace et al. 1997, A&A, 317, 212. DRAO at 408 MHz (3'.4×5'.5) and 1.4 GHz (1'.0×1'.6) including HI (smoothed to 2'). ADS
• Lorimer et al. 1998, A&A, 331, 1002. Pulsar search. ADS
• Kothes et al. 2003, ApJ, 588, 852. CGPS at 1.4 GHz (1'.6×1') including HI, plus CO observations. ADS
• Kothes et al. 2006, A&A, 457, 1081. CGPS at 408 MHz (~3': S=11.9±0.9 Jy) and 1420 MHz (~1': S=7.1±1.1 Jy), including polarisation and review of flux densities. ADS

Last updated: 20 Feb 2009