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Marco Miceli, INAF – Osservatorio Astronomico di PalermoConsorzio COMETA, Italy
Collaborators
F. Bocchino, INAF – Osservatorio Astronomico di Palermo, Italy F. Reale, INAF – OAPa, Università di Palermo, ItalyS. Orlando, INAF – Osservatorio Astronomico di Palermo, Italy
5th Jetset School onHigh Performance Computing
in Astrophysics
8th-13th January 2008 Galway, Ireland
Hydrodynamic evolution of Hydrodynamic evolution of ejecta in the Vela SNRejecta in the Vela SNR
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Supernova RemnantsSupernova Remnants
Supernova explosion
Total energy released: 1053 erg
“Visible” energy: 1051 erg
Mass ejected: several solar masses
G292.0+1.8
Formation of blast wave shocks Heating of the ambient medium Compression Interaction with interstellar clouds
Propagation of the ejecta Chemical enrichment of the galaxy Propagation of supersonic “bullets”
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The Vela SNRThe Vela SNR
The Vela SNRDistance: ~250 pc
Age: ~11000 yr In middle-aged SNR the bulk of the X-ray emission is commonly associated with shocked ISM, but:
Vela SNR: 6 X-ray emitting “shrapnels”, that are probably associated with ejecta (outside the border of the shell).
Recent discovery of new shrapnels inside the shell (Miceli et al. 2007, ApJ accepted)
0.1-2.3 keV
Rosat All Sky Survey
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Hydrodynamic modelingHydrodynamic modeling
: mass densityv: bulk velocityP: pressureE: tot. energy per unit massq: (T) T (Spitzer & saturated)n: density (T): radiative losses function: internal energy per unit mass
Numerical solution through the FLASH HD code (Fryxell, 2000)
P=
Aims: evolution of supersonic fragments of ejecta (interaction with the shock waves and with the ambient medium)
Equations of the model:
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Hydrodynamic modelingHydrodynamic modeling
r (cm)z
(cm
)
Initial conditions: exploding sphere of ejecta with a density inhomogeneity(i. e. the shrapnel)
Mej = 12 M⊙
E = 1051 erg
R0 = 4.5 x 1018 cm
Vej(R0) = 6 x 1018 cm/s (v(R) r)
(R) following Wang & Chevalier 2002
Mshrapnel = 1/20 Mej
shrapnel = ej
2-D simulations in cylindrical coordinates (axial symmetry). We follow the evolution of the system for ~ 15000 yr (the Vela age is ~ 11000 yr)
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Parameter space exploration(*): We investigate how the evolution of the system depends on the density contrast (between the shrapnel and the surrounding ejecta) and on the initial position of the shrapnel.
Rsh
rap
nel/R
0
“Complete” run executed on the CINECA CLX cluster (total CPU time~9000 h)
“Complete” runs to be done on the COMETA HPC system
Pure HD run (no thermal cond. no rad. losses) executed on the HPC system COMETA (total CPU time~250 h, memory~7 Mb, output size~3 Gb).
Hydrodynamic modelingHydrodynamic modeling
(*) Work in progress…
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log (g/cm3) T (K)spatial res. 2048 x 2048 point
The Vela SNR0.1-2.4 keV
ROSAT All SKy Survey(0.1-2.4 keV)
The “pure HD” run: = 30, Rshr = 1/3 R0)
Hydrodynamic modelingHydrodynamic modeling