G78.2+2.1     DR4, γ Cygni SNR

• Right Ascension: 20 20 50
• Declination: +40 26
• Size (/arcmin): 60
• Type: S
• Flux density at 1 GHz (/Jy): 320
• Spectral Index: 0.51

Notes: Has been called G78.1+1.8.

Radio: In complex region (early catalogues refer to other proposed remnants in this region).

Optical: Faint filaments, spectra indicate a SNR superposed on a HII region.

X-ray: Weak emission from the SE of the remnant.

Point sources: X-ray pulsar at edge of remnant.

Distance: Associations with other objects suggests 1.7 to 2.6 kpc.

References:

• Higgs et al. 1977, AJ, 82, 718. DRAO at 1.4 GHz (2'×3': S=270±40 Jy) plus some 10 GHz (4') survey data, reveals true extent of remnant. ADS
• d'Odorico & Sabbadin 1977, A&AS, 28, 439. Optical spectra. ADS
• van den Bergh 1978, ApJS, 38, 119. Optical observations. ADS
• Landecker et al. 1980, A&AS, 39, 133. DRAO HI observations (2'×3'.1). ADS
• Higgs et al. 1983, AJ, 88, 97. CO of surroundings. ADS
• Bohigas et al. 1983, RMxAA, 8, 155. Optical spectra, find thermal only. ADS
• Braun & Strom 1986, A&AS, 63, 345. WSRT HI observations. ADS
• Fukui & Tatematsu 1988, IAUCo, 101, 261. CO observations of the vicinity (2'.7). ADS
• Green 1989, MNRAS, 238, 737. OH observations. ADS
• Pineault & Chastenay 1990, MNRAS, 246, 169. DRAO at 408 MHz (3'.4×5'.8: S=480±60 Jy) and 1.4 GHz (1'.0×1'.7: S=270±40 Jy). ADS
• Wendker et al. 1991, A&A, 241, 551. DRAO at 408 MHz (3'.5×5'.2: S=540±40 Jy) and Effelsberg 100-m at 4.8 GHz (S=150±15 Jy). ADS
• Esposito et al. 1996, ApJ, 461, 820. Associated γ-ray emission. ADS
• Brazier et al. 1996, MNRAS, 281, 1033. γ-ray and X-ray point source. ADS
• Biggs & Lyne 1996, MNRAS, 282, 691. Pulsar search. ADS
• Zhang et al. 1997, A&A, 324, 641. Multi-frequency radio comparison. ADS
• Lorimer et al. 1998, A&A, 331, 1002. Pulsar search. ADS
• Roberts et al. 2001, ApJS, 133, 451. ASCA observations. ADS
• Uchiyama et al. 2002, ApJ, 571, 866. ASCA observations. ADS
• Mavromatakis 2003, A&A, 408, 237. Optical observations. ADS
• Bykov 2004, A&A, 427, L21. Hard X-ray observations. ADS
• Becker et al. 2004, ApJ, 615, 897. Chandra and other observations of compact sources. ADS
• Weisskopf et al. 2006, ApJ, 652, 387. Chandra and other observations of compact sources. ADS
• Kothes et al. 2006, A&A, 457, 1081. CGPS at 408 MHz (~3': S=500±35 Jy) and 1420 MHz (~1': S=226±19 Jy), including review of flux densities. ADS
• Kang & Koo 2007, ApJS, 173, 85. SGPS of high velocity HI. ADS
• Casandjian & Grenier 2008, A&A, 489, 849. γ-ray observations. ADS
• Ladouceur & Pineault 2008, A&A, 490, 197. CGPS at 408 MHz (2'.9×4'.5) and 1.4 GHz (0'.8×1'.5). ADS
• Gao et al. 2011, A&A, 529, A159. Urumqi 25-m at 5 GHz (9'.5: S=170±18 Jy), including polarisation and review of flux densities. ADS
• Leahy et al. 2013, MNRAS, 436, 968. ROSAT and Chandra observations, and CGPS for HI. ADS
• Aliu et al. 2013, ApJ, 770, 93. γ-ray observations. ADS
• Lin et al. 2013, ApJ, 770, L9. Pulsar detection. ADS

Last updated: 23 May 2014