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.

Point sources: Central compact X-ray source.

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

References:

• Anderson et al. 1991, ApJ, 373, 146. VLA at 1.4 and 5 GHz (1".3) for spectral variations. ADS
• Anderson et al. 1995, ApJ, 441, 300. VLA at 1.4 GHz and 4.8 GHz (both 1".3), for polarisation studies. ADS
• Anderson & Rudnick 1995, ApJ, 441, 307. VLA at 1.4 GHz and 4.8 GHz, for proper motion studies. 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
• 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
• 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. 151 MHz observations for bulk expansion studies. ADS
• Mason et al. 1999, AJ, 118, 2908. Flux density at 32 GHz (S=194±5 Jy). ADS
• Reichart & Stephens 2000, ApJ, 537, 904. Flux density changes at 1405 MHz. ADS
• Gotthelf et al. 2001, ApJ, 552, L39. Chandra observations, showing outer shock. ADS
• Bleeker et al. 2001, A&A, 365, L225. XMM observations. ADS
• Maccarone et al. 2001, A&A, 368, 267. BeppoSAX observations. ADS
• Douvion et al. 2001, A&A, 369, 589. ISO observations. 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 observations. ADS
• Mereghetti et al. 2002, ApJ, 569, 275. XMM observations of central source. ADS
• Reynoso & Goss 2002, ApJ, 575, 871. VLA at 5 GHz (6".4×6".0) for H₂CO absorption studies. ADS
• Reich 2002, in NSPS, p1. Effelsberg 100-m at 32 GHz, including polarisation. ADS
• Rho et al. 2003, ApJ, 592, 299. IR observations. ADS
• Laming & Hwang 2003, ApJ, 597, 347. Chandra spectroscopy. ADS
• Hines et al. 2004, ApJS, 154, 290. Spitzer observations. ADS
• Morse et al. 2004, ApJ, 614, 727. HST proper motion studies. ADS
• Hwang et al. 2004, ApJ, 615, L117. Deep Chandra imaging. ADS
• Krause et al. 2004, Nature, 432, 596. IR and molecular line observations of surroundings. ADS
• Bamba et al. 2005, ApJ, 621, 793. Chandra observations of rim. ADS
• Wilson & Batrla 2005, A&A, 430, 561. Observational constraints on dust. ADS
• Krause et al. 2005, Science, 308, 1604. Spitzer light echoes from surroundings. ADS
• Fesen et al. 2006, ApJ, 636, 848. Optical and IR limits for central sources. ADS
• Vinyaĭkin 2006, ARep, 50, 143. Secular decrease at 36, 81.5 and 151.5 MHz. ADS
• Laming et al. 2006, ApJ, 644, 260. Chandra observations, particularly of NE `jet'. ADS
• Fesen et al. 2006, ApJ, 645, 283. HST observations for expansion studies. ADS
• Renaud et al. 2006, ApJ, 647, L41. γ-ray line observations. ADS
• Lazendic et al. 2006, ApJ, 651, 250. Chandra spectroscopy of bright knots. ADS
• Ennis et al. 2006, ApJ, 652, 376. Spitzer observations. ADS
• Mookerjea et al. 2006, MNRAS, 371, 761. Sub-mm [CI] observations. ADS
• Kang & Koo 2007, ApJS, 173, 85. SGPS of high velocity HI. ADS
• Patnaude & Fesen 2007, AJ, 133, 147. X-ray variability of compact features. ADS
• Albert et al. 2007, A&A, 474, 937. γ-ray observations. ADS
• Rho et al. 2008, ApJ, 673, 271. Spitzer observations. ADS
• Uchiyama & Aharonian 2008, ApJ, 677, L105. X-ray variability of compact features. ADS
• Rest et al. 2008, ApJ, 681, L81. SN light echo. ADS
• Hammell & Fesen 2008, ApJS, 179, 195. HST of outer knots. ADS
• Krause et al. 2008, Science, 320, 1195. SN light echo spectrum. ADS
• Hurley-Walker et al. 2009, MNRAS, 396, 365. Radio observations at 14 to 18 GHz. ADS
• Helmboldt & Kassim 2009, AJ, 138, 838. Low radio frequency temporal variations. ADS
• Maeda et al. 2009, PASJ, 61, 1217. Suzaku observations. ADS
• Smith et al. 2009, ApJ, 693, 713. Spitzer observations. ADS
• Patnaude & Fesen 2009, ApJ, 697, 535. X-ray proper motions. ADS
• Pavlov & Luna 2009, ApJ, 703, 910. Chandra observations of central source. ADS
• Barlow et al. 2010, A&A, 518, L138. Herschel observations. ADS
• Abdo et al. 2010, ApJ, 710, L92. Fermi observations. ADS
• Acciari et al. 2010, ApJ, 714, 163. γ-ray observations. ADS
• Sibthorpe et al. 2010, ApJ, 719, 1553. AKARI and sub-mm observations of region. ADS
• DeLaney et al. 2010, ApJ, 725, 2038. Spitzer and Chandra observations for 3-D structure. ADS
• Patnaude et al. 2011, ApJ, 729, L28. Chandra observations of fading. ADS
• Rest et al. 2011, ApJ, 732, 3. SN light echo observations. ADS
• Fesen et al. 2011, ApJ, 736, 109. HST variability studies. ADS
• Besel & Krause 2012, A&A, 541, L3. IR light echoes. ADS
• Hwang & Laming 2012, ApJ, 746, 130. Chandra observations. ADS
• Rho et al. 2012, ApJ, 747, L6. AKARI CO observations. ADS
• Vogt et al. 2012, ApJ, 750, 155. Spitzer light echoes. ADS
• Isenne et al. 2012, ApJ, 757, 126. Spitzer spectroscopy. ADS
• Asgekar et al. 2013, A&A, 551, L11. LOFAR of carbon recombination lines. ADS
• Yang et al. 2013, ApJ, 766, 44. Suzaku spectroscopy. ADS
• Rutherford et al. 2013, ApJ, 769, 64. Chandra spectroscopy. ADS
• Milisavljevic & Fesen 2013, ApJ, 772, 134. Optical spectroscopy for 3-D structure. ADS
• Koo et al. 2013, Science, 342, 1346. IR spectroscopy. ADS
• Willström et al. 2013, A&A, 558, L2. CO observations. ADS

Last updated: 30 May 2014