Note: this is an archived version which has been superseded.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

G74.0−8.5     Cygnus Loop

• Right Ascension: 20 51 00
• Declination: +30 40
• Size (/arcmin): 230×160
• Type: S
• Flux density at 1 GHz (/Jy): 210
• Spectral Index: varies

Notes: Has been suggested that this is two overlapping remnants.

Radio: Shell, brightest to the NE, with fainter breakout region to S, with spectral variations.

Optical: Large filamentary loop, brightest to the NE, not well defined to the S or W.

X-ray: Shell in soft X-rays.

Point sources: Several compact radio sources within the boundary of the remnant, including CL4, plus X-ray sources in S.

Distance: Optical proper motion and shock velocity gives 0.44 kpc.

References:

• Green 1984, MNRAS, 211, 433. Most of remnant at 408 MHz (80"×160"). ADS
• Braun & Strom 1986, A&A, 164, 208. IRAS observations. ADS
• Straka et al. 1986, ApJ, 306, 266. Radio and optical comparison of NE. VLA at 1.6 GHz (4".7) plus optical. ADS
• Green 1990, AJ, 100, 1927. DRAO at 408 MHz (3'.3×6'.7) for spectral index study, plus X-ray and optical. ADS
• Graham et al. 1991, AJ, 101, 175. Shocked molecular H outside rim in NE. ADS
• Shull & Clarke 1991, PASP, 103, 811. Optical spectroscopy of nearside filaments. ADS
• Greidanus & Strom 1992, A&A, 257, 265. Optical kinematics. ADS
• Shull & Hippelein 1992, ApJ, 383, 714. Optical kinematics and proper motion. ADS
• Fesen et al. 1992, AJ, 104, 719. Hα imagery. ADS
• Cornett et al. 1992, ApJ, 395, L9. UV imagery. ADS
• Long et al. 1992, ApJ, 400, 214. Optical of Balmer dominated filament. ADS
• Arendt et al. 1992, ApJ, 400, 562. IRAS observations. ADS
• Hester et al. 1994, ApJ, 420, 721. Hα, [OIII] and other optical observations of Balmer dominated filaments in NE. ADS
• Graham et al. 1995, ApJ, 444, 787. X-ray and optical studies of interaction with surroundings. ADS
• Sauvageot & Decourchelle 1995, A&A, 296, 201. [FeX] and [FeXIV] observations. ADS
• Gorham et al. 1996, ApJ, 458, 257. Pulsar search. ADS
• Biggs & Lyne 1996, MNRAS, 282, 691. Pulsar search. ADS
• Levenson et al. 1996, ApJ, 468, 323. ROSAT and optical observations of W. ADS
• Decourchelle et al. 1997, A&A, 326, 811. ROSAT observations of N. ADS
• Levenson et al. 1997, ApJ, 484, 304. ROSAT observations. ADS
• Leahy et al. 1997, AJ, 114, 2081. DRAO at 1.4 GHz (1'×2'), including polarisation. ADS
• Miyata et al. 1998, PASJ, 50, 257. ASCA observations. ADS
• Miyata et al. 1998, PASJ, 50, 475. ASCA observations of compact X-ray source in S. ADS
• Leahy & Roger 1998, ApJ, 505, 784. DRAO at 1.4 GHz (1'.0×1'.9) and 408 MHz (3'.4×6'.9), for spectral index studies in comparison with other radio observations. ADS
• Levenson et al. 1998, ApJS, 118, 541. Optical images. ADS
• Roger et al. 1999, A&AS, 137, 7. 22 MHz flux density (S=1400±400 Jy). ADS
• Bohigas et al. 1999, ApJ, 518, 324. Optical spectroscopy of surroundings. ADS
• Levenson et al. 1999, ApJ, 526, 874. ROSAT images. ADS
• Blair et al. 1999, AJ, 118, 942. HST observations, for distance. ADS
• Aschenbach & Leahy 1999, A&A, 341, 602. ROSAT image, and comparison with radio. ADS
• Sauvageot et al. 1999, A&A, 351, 669. [NeV] observations. ADS
• Szentgyorgyi et al. 2000, ApJ, 529, 279. [NeV] images. ADS
• Danforth et al. 2000, AJ, 119, 2319. UV, optical and X-ray comparison of selected regions. ADS
• Sankrit et al. 2000, AJ, 120, 1925. HST far-UV spectra on non-radiative shock. ADS
• Miyata et al. 2001, ApJ, 550, 1023. ASCA observations of compact X-ray sources. ADS
• Miyata & Tsunemi 2001, ApJ, 552, 624. ASCA spectroscopy of regions in N and E. ADS
• Ghavamian et al. 2001, ApJ, 547, 995. Optical spectroscopy. ADS
• Danforth et al. 2001, AJ, 122, 938. Far-UV spectroscopy, Hα and other optical observations of NE region. ADS
• Levenson & Graham 2001, ApJ, 559, 948. HST of SE region. ADS
• Uyanıker et al. 2002, A&A, 389, L61. Effelsberg 100-m at 2.7 GHz (4'.3) including polarisation, and comparison with ROSAT data. ADS
• Leahy 2002, AJ, 123, 2689. DRAO at 1.4 GHz (4'×2') for HI. ADS
• Patnaude et al. 2002, AJ, 124, 2118. Optical and ROSAT observations of region in SW. ADS
• Blair et al. 2002, ApJS, 140, 367. UV spectroscopy. ADS
• Welsh et al. 2002, A&A, 391, 705. Optical absorption to background stars. ADS
• Sankrit & Blair 2002, ApJ, 565, 297. UV observations of NE filament. ADS
• Levenson et al. 2002, ApJ, 576, 798. Chandra observations of W edge. ADS
• Reich et al. 2003, A&A, 408, 961. Effelsberg 100-m at 863 MHz (14'.5: S=184±18 Jy). ADS
• Uyanıker et al. 2004, A&A, 426, 909. Effelsberg 100-m at 2.7 GHz (4'.3), with comparison with other data for spectral index studies. ADS
• Blair et al. 2005, AJ, 129, 2268. HST of outer filaments. ADS
• Leahy 2005, AJ, 130, 165. DRAO at 1.4 GHz of SE. ADS
• Levenson & Graham 2005, ApJ, 622, 366. Chandra observations of know in SE. ADS
• Sun et al. 2006, A&A, 447, 937. Urumqi 25-m at 4.8 GHz (9'.5: S=90±9 Jy), with comparisons with other data for spectral index studies. ADS

Last updated: 1 Apr 2006