Note: this is an archived version which has been superseded.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

G111.7-2.1 Cassiopeia A, 3C461

• Right Ascension: 23 23 26
• Declination: +58 48
• Size (/arcmin): 5
• Type: S
• Flux density at 1 GHz (/Jy): 2720
• Spectral Index: 0.77

Notes: Presumably the remnant of a late 17th century SN.

Radio: Bright shell with compact knots and extended plateau of emission.

Optical: Fast knots and quasi-stationary flocculli, with many filaments at large radii, and NE `jet'.

X-ray: Incomplete shell, with hard spectral component, and compact central source.

Distance: Optical expansion, plus proper motions indicate 3.4 kpc.

References:

• Woan & Duffett-Smith 1990, MNRAS, 243, 87. Structure at 81.5 MHz. ADS
• Rees 1990, MNRAS, 243, 637. Flux density decrease at 38 MHz. ADS
• Anderson et al. 1991, ApJ, 373, 146. VLA at 1.4 and 5 GHz (1".3) for spectral variations. ADS
• Reed et al. 1995, ApJ, 440, 706. Optical spectra, for 3-d structure. ADS
• Anderson et al. 1995, ApJ, 441, 300. VLA at 1.4 GHz and 4.8 GHz (both 1".3), for polarization studies. ADS
• Anderson & Rudnick 1995, ApJ, 441, 307. VLA at 1.4 GHz and 4.8 GHz, for proper motion studies. ADS
• Predehl & Schmitt 1995, A&A, 293, 889. ROSAT of dust scattered halo. ADS
• Lawrence et al. 1995, AJ, 109, 2635. Optical imaging spectroscopy. ADS
• Kassim et al. 1995, ApJ, 455, L59. VLA at 74 (25") and 332 MHz (6"), including spectral index comparisons. ADS
• Anderson & Rudnick 1996, ApJ, 456, 234. VLA for spectral index comparisons. ADS
• Agafanov 1996, A&A, 306, 578. Flux density decrease at 102 MHz. ADS
• Vink et al. 1996, A&A, 307, L41. ASCA spectrum. ADS
• Lagage et al. 1996, A&A, 315, L273. ISO observations. ADS
• Keohane et al. 1996, ApJ, 466, 309. Radio and X-ray comparison. ADS
• Hurford & Fesen 1996, ApJ, 469, 246. Optical spectroscopy and reddening studies. ADS
• Fesen & Gunderson 1996, ApJ, 470, 967. Optical observations of NE `jet'. ADS
• Schwarz et al. 1997, A&AS, 123, 43. WSRT at 1.4 GHz (30") for HI absorption. ADS
• Reynoso et al. 1997, A&A, 317, 203. VLA at 1.4 GHz (11"×14") for HI absorption. ADS
• Dupraz et al. 1997, A&A, 324, 683. gamma-ray line detection. ADS
• Koralesky et al. 1998, AJ, 116, 1323. VLA search for OH emission. ADS
• Vink et al. 1998, A&A, 339, 201. Comparison of ROSAT and Einstein images for expansion studies. ADS
• Keohane et al. 1998, ApJ, 503, L175. Deep ROSAT image, and comparison with radio. ADS
• Koralesky et al. 1998, ApJ, 505, L27. Comparison of ROSAT and Einstein images for expansion studies. ADS
• Wright et al. 1999, ApJ, 518, 284. BIMA at 83 GHz (6".5×6".2) at 28 GHz, for comparison with other radio images for spectral index studies. ADS
• Arendt et al. 1999, ApJ, 521, 234. ISO observations. ADS
• O'Sullivan & Green 1999, MNRAS, 303, 575. Flux density changes at 13.5, 15.5 and 16.5 GHz. ADS
• Agüeros & Green 1999, MNRAS, 305, 957. CLFST at 151 MHz for bulk expansion studies. ADS
• Mason et al. 1999, AJ, 118, 2908. Flux density at 32 GHz (S=194±5 Jy). ADS
• Vink et al. 1999, A&A, 344, 289. X-ray line and continuum observations. ADS
• Liszt & Lucas 1999, A&A, 347, 258. NRAO 12-m at 86 GHz (72": S=101±3.3 Jy) and 140 GHz (44": S=69.6±6.3 Jy), plus CO observations. ADS
• Douvion et al. 1999, A&A, 352, L111. ISO observations. ADS
• Hughes et al. 2000, ApJ, 528, L109. Chandra observations. ADS
• Reichart & Stephens 2000, ApJ, 537, 904. Flux density changes at 1405 MHz. ADS
• Hwang et al. 2000, ApJ, 537, L119. Chandra imaging, including lines. ADS
• Chakrabarty et al. 2001, ApJ, 548, 800. Chandra observations, including central compact source. ADS
• Ryan et al. 2001, ApJ, 548, 811. Optical limits in compact central source. ADS
• Gotthelf et al. 2001, ApJ, 552, L39. Chandra observations, showing outer shock. ADS
• Kaplan et al. 2001, ApJ, 558, 270. Search for near-IR counterpart to central source. ADS
• Vink et al. 2001, ApJ, 560, L79. BeppoSAX X-ray line observations. ADS
• Fesen 2001, ApJS, 133, 161. Optical imaging and spectroscopy. ADS
• Bleeker et al. 2001, A&A, 365, L225. XMM-Newton observations. ADS
• Maccarone et al. 2001, A&A, 368, 267. BeppoSAX observations. ADS
• Douvion et al. 2001, A&A, 369, 589. ISO observations. ADS
• Aharonian et al. 2001, A&A, 370, 112. High energy gamma-ray emission detection. ADS
• Gerardy & Fesen 2001, AJ, 121, 2781. IR spectroscopy and imaging. ADS
• Thorstensen et al. 2001, AJ, 122, 297. Optical expansion studies. ADS
• Hwang et al. 2001, ApJ, 560, L175. Chandra observations of Doppler shifted lines. ADS
• Fesen et al. 2001, AJ, 122, 2644. HST observations. ADS
• Willingale et al. 2002, A&A, 381, 1039. XMM-Newton observations. ADS
• Mereghetti et al. 2002, ApJ, 569, 275. XMM-Newton observations of central source. ADS
• Reynoso & Goss 2002, ApJ, 575, 871. VLA at 5 GHz (6".4×6".0) for H₂CO absorption studies. ADS
• Dunne et al. 2003, Natur, 424, 285. Sub-mm dust observations. ADS
• Rho et al. 2003, ApJ, 592, 299. IR observations. ADS
• Laming & Hwang 2003, ApJ, 597, 347. Chandra spectroscopy. ADS
• DeLaney & Rudnick 2003, ApJ, 589, 818. Chandra expansion studies. ADS
• Jones et al. 2003, ApJ, 587, 227. 2.2 micron polarisation. ADS

Last updated: 23 Jan 2004