1. CROSSING THE SHOCK: illuminating the ejecta of Cas A L. Rudnick, Univ
CROSSING THE SHOCK: illuminating the ejecta of Cas A L. Rudnick, Univ. of Minnesota
E July, 1820h, 515B

2. The work of many hands… SPITZER RADIO, X-RAY, OPTICAL 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)

3. Messages to take home The ONLY ejecta which have been seen in Cas A•
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. •

4. The Explosion - structure

5. Multiple temperature overlapping plasmas
104K
relativistic
107K
102K

6. Explosion paradox - optical, X-ray, radio

7. New view of the explosion

8. Bits of wisdom The motion of material is different
than the motion of the shock –
Ejecta become visible as they encounter the reverse shock

9. Illuminating the nucleosynthesis layers

10. 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

11. Explosion in 3D Doppler motions

13. The Explosion in 3-D

14. More to come?
Si XIV
Si II

16. Si XIII
Si XIV

17. Messages to take home The ONLY ejecta which have been seen in Cas A•
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. •