A Million Second Chandra View of Cassiopeia A

By U. Hwang, J. Laming, C. Badenes, F. Berendse, J. Blondin, Denis F. Cioffi, T. Delaney, D. Dewey, R. Fesen, K. Flanagan and 13 more. 2004

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We introduce a million second observation of the supernova remnant Cassiopeia A with the Chandra X-Ray Observatory. The bipolar structure of the Si-rich ejecta (northeast jet and southwest counterpart) is clearly evident in the new images, and their chemical similarity is confirmed by their spectra. These are most likely due to jets of ejecta as opposed to cavities in the circumstellar medium, since we can reject simple models for the latter. The properties of these jets and the Fe-rich ejecta will provide clues to the explosion of Cas A.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/93b13d0329461962b9e1ff89bb5cadc54f5697d4

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Citations in the corpus

Non-spherical core collapse supernovae - II. The late-time evolution of globally anisotropic neutrino-driven explosions and their implications for SN 1987 A (2005, background): “We believe that the global asymmetries imprinted on the ejecta by low-mode hydrodynamic instabilities in the neutrinoheated postshock layer may also offer an explanation of the large-scale anisotropy of the element distribution visible in the Cassiopeia A supernova remnant (Hwang et al. 2004).”
Aluminum-, Calcium- and Titanium-rich Oxide Stardust in Ordinary Chondrite Meteorites (2008, background): “Mixing in supernova ejecta is observed to be highly heterogeneous and variable from remnant to remnant (Hwang et al. 2004; Park et al. 2004).”
OBSERVATIONS OF THE YOUNG SUPERNOVA REMNANT RX J1713.7−3946 WITH THE FERMI LARGE AREA TELESCOPE (2011, background): “In particular, X-ray and TeV gamma-ray43 observations of young SNRs such as Cas A (Hwang et al. 2004; Gotthelf et al. 2001; Albert44 et al. 2007; Abdo et al. 2010b), or RX J1713.”
Spectropolarimetry of Supernovae (2008, background): “Soc., 227, 1P Howell et al.(2001)Howell, D. A., Höflich, P., Wang, L., & Wheeler, J. C. 2001, ApJ, 556, 302 Hwang et al.(2004)Hwang, U., et al. 2004, Ap.”
Supernova remnant energetics and magnetars: no evidence in favour of millisecond proto-neutron stars (2006, background): “Interestingly, however, there is considerable evidence for a jet in the SNR Cas A (Fesen 2001; Vink 2004; Hwang et al. 2004), and there is indeed evidence, although not conclusive, that the point source in Cas A is a magnetar (Krause et al. 2005).”
DIRECT OBSERVATION OF THE COOLING OF THE CASSIOPEIA A NEUTRON STAR (2010, background): “It is relatively close-by (d = 3.4+0.3 −0.1 kpc, Reed et al. 1995) and the supernova remnant has been well-studied, with over a megasecond of Chandra ACIS observations spread over 10 years (Hwang et al. 2004; DeLaney et al. 2004; Patnaude & Fesen 2007, 2009).”
Simulations of Magnetically Driven Supernova and Hypernova Explosions in the Context of Rapid Rotation (2007, background): “However, the jet / counterjet structure seen in Cas A (Hwang et al. 2004) may be such a secondary explosion.”
The physics of core-collapse supernovae (2005, background): “The expanding debris of the exploding star is deformed and its composition stirred up, with elements made deep inside mixed to the outside, as seen, for example, in the Cassiopeia A supernova remnan”