G111.7−2.1 ADS: search fulltext or title/keyword/abstract

Cassiopeia A, 3C461

• Right Ascension: 23 23 26
• Declination: +58 48
• Size (/arcmin): 5
• Type: S
• Flux density at 1 GHz (/Jy): 2300
• 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; shows secular decline.

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 gives 3.3 kpc.

References:

• 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
• 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
• Gotthelf et al. 2001, ApJ, 552, L39. Chandra observations, showing outer shock. 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
• Reynoso & Goss 2002, ApJ, 575, 871. VLA at 5 GHz (6.''0×6.''4) for H₂CO absorption studies. ADS
• Krause et al. 2005, Science, 308, 1604. Spitzer light echoes from surroundings. ADS
• Ennis et al. 2006, ApJ, 652, 376. Spitzer observations. ADS
• Kang & Koo 2007, ApJS, 173, 85. SGPS of high velocity HI. ADS
• Rho et al. 2008, ApJ, 673, 271. Spitzer observations. ADS
• Rest et al. 2008, ApJ, 681, L81. SN light echo. ADS
• Krause et al. 2008, Science, 320, 1195. SN light echo spectrum. ADS
• Helmboldt & Kassim 2009, AJ, 138, 838. Low radio frequency temporal variations. ADS
• Barlow et al. 2010, A&A, 518, L138. Herschel 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
• Vogt et al. 2012, ApJ, 750, 155. Spitzer light echoes. 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
• DeLaney et al. 2014, ApJ, 785, 7. VLA plus Pie Town at 74 MHz (9'') and comparison with higher frequencies. ADS
• Arendt et al. 2014, ApJ, 786, 55. Spitzer and Herschel IR observations. ADS
• Patnaude & Fesen 2014, ApJ, 789, 138. Multi-epoch optical and X-ray observations. ADS
• Lee et al. 2014, ApJ, 789, 7. Spitzer and CO observations. ADS
• Vinyaikin 2014, ARep, 58, 626. Time evolution of radio emission. ADS
• Alarie et al. 2014, MNRAS, 441, 2996. Optical imaging/spectroscopy, including distance from expansion. ADS
• Grefenstette et al. 2014, Nature, 506, 339. NuSTAR ⁴⁴Ti observations. ADS
• Grefenstette et al. 2015, ApJ, 802, 15. NuSTAR observations. ADS
• Lee et al. 2015, ApJ, 808, 98. WISE, Spitzer and other IR observations. ADS
• Milisavljevic & Fesen 2015, Science, 347, 526. Near-IR observations. ADS
• Planck Collaboration: Arnaud et al. 2016, A&A, 586, A134. Planck flux densities at 7 frequencies between 30 and 353 GHz. ADS
• Kilpatrick et al. 2016, ApJ, 816, 1. CO observations, including broad lines. ADS
• Fesen & Milisavljevic 2016, ApJ, 818, 17. HST [SIII] and [SII] observations. ADS
• Koo et al. 2016, ApJ, 821, 20. Spitzer and Herschel flux densities (and comparison with X-ray properties). ADS
• Wang & Li 2016, ApJ, 825, 102. INTEGRAL observations. ADS
• Acero et al. 2016, ApJS, 224, 8. Fermi observations. ADS
• Oonk et al. 2017, MNRAS, 465, 1066. LOFAR observations, including H and C lines, 33 to 78 MHz, including 69 MHz (9.''8×11.''2). ADS
• De Looze et al. 2017, MNRAS, 465, 3309. Spitzer and Herschel observations. ADS
• Trotter et al. 2017, MNRAS, 469, 1299. Time evolution of radio emission. ADS
• Grefenstette et al. 2017, ApJ, 834, 19. NuSTAR observations. ADS
• Sato et al. 2017, ApJ, 836, 225. Multi-epoch Chandra observations. ADS
• Lee et al. 2017, ApJ, 837, 118. IR observations. ADS
• Arias et al. 2018, A&A, 612, A110. LOFAR at 30 to 77 MHz (7''×17''). ADS
• Salas et al. 2018, MNRAS, 475, 2496. LOFAR C recombination lines as 43, 54, 148 and 340 MHz (70''). ADS
• Sato et al. 2018, ApJ, 853, 46. Chandra and NuSTAR observations. ADS
• Zhou et al. 2018, ApJ, 865, 6. CO observations. ADS
• Raymond et al. 2018, ApJ, 866, 128. IR observations. ADS
• Koo et al. 2018, ApJ, 866, 139. IR observations. ADS
  also see: Koo et al. 2020, ApJ, 896, 177. Erratum. ADS
• Chowdhury & Chengalur 2019, MNRAS, 486, 42. GMRT at 410 to 460 MHz for C recombination lines. ADS
• Weinberger et al. 2020, A&A, 638, A83. INTEGRAL observations. ADS
• Koo et al. 2020, NatAs, 4, 584. Near IR spectroscopy of surroundings. ADS
• Weil et al. 2020, ApJ, 891, 116. Deep Hα of surroundings. ADS
• Mayer & Becker 2021, A&A, 651, A40. Multi-epoch Chandra observations for proper motion of compact source. ADS
• Domček et al. 2021, MNRAS, 502, 1026. Radio to IR spectral study. ADS

Last updated: 16 Dec 2022

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