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CROSSING THE SHOCK: illuminating the ejecta of Cas A L. Rudnick, Univ. of Minnesota. E13-0024-08 13 July, 1820h, 515B. The work of many hands…. SPITZER T. DeLaney, MIT J. Ennis, U MN T. Kozasa, Hokkaido H. Morgan, Cardiff W. Reach, Spitzer J. Rho, Spitzer J.D. Smith, U. Ohio
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CROSSING THE SHOCK: illuminating the ejecta of Cas AL. Rudnick, Univ. of Minnesota E13-0024-0813 July, 1820h, 515B
The work of many hands… SPITZER T. DeLaney, MIT J. Ennis, U MN T. Kozasa, Hokkaido H. Morgan, Cardiff W. Reach, Spitzer J. Rho, Spitzer J.D. Smith, U. Ohio K. Isensee, U MN RADIO, X-RAY, OPTICAL R. Petre, U. Hwang, GSFC R. Fesen (Dartmouth) J. Bowden (Colorado Coll.) N. Kassim (Naval RL) Funding: NASA (Chandra/HST/Spitzer) and NSF (radio)
Messages to take home • • The ONLY ejecta which have been seen in Cas A (optical, IR, X-ray, radio) are those that have just crossed the reverse shock • The explosion of the inner layers was flattened. with multiple “jets” different nucleosynthesis layers are now visible in each direction. ● Much of the ejecta is still in the interior, waiting to encounter the reverse shock. •
Multiple temperature overlapping plasmas 104K relativistic 107K 102K
Bits of wisdom • The motion of material is different than the motion of the shock – • Ejecta become visible as they encounter the reverse shock
Illuminating the nucleosynthesis layers Circumstellar H,He burn Small C grains, PAH? O-burning Si, Ar, S + dust: SiO2, FeO, MgSiO3 C-burning: Ne, O + dust: Al2O3
More to come? Si XIV Si II
Si XIII Si XIV
Messages to take home • • The ONLY ejecta which have been seen in Cas A (optical, IR, X-ray, radio) are those that have just crossed the reverse shock • The explosion of the inner layers was flattened. with multiple “jets” different nucleosynthesis layers are now visible in each direction. • Much of the ejecta is still in the interior, waiting to encounter the reverse shock. •