High spatial resolution X-ray spectroscopy of SNR Cassiopeia A with {\sl Chandra}

Abstract

We present high spatial resolution X-ray spectroscopy of supernova remnant Cassiopeia A with the {\sl Chandra} observations. The X-ray emitting region of this remnant was divided into 38 $\times$ 34 pixels with a scale of 10$\arcsec$ $\times$ 10$\arcsec$ each. Spectra of 960 pixels were created and fitted with an absorbed two component non-equilibrium ionization model. With the spectral analysis results we obtained maps of absorbing column density, temperatures, ionization ages, and the abundances for Ne, Mg, Si, S, Ca and Fe. The Si, S and possibly Ca abundance maps show obviously jet structures, while Fe doesn't follow the jet but seems to be distributed perpendicular to it. In the range of about two orders of magnitude, the abundances of Si, S and Ca show tight correlations between each other, suggesting them to be ejecta from explosive O-burning and incomplete Si-burning. Meanwhile, Ne abundance is well correlated with that of Mg, indicating them to be the ashes of explosive C/Ne burning. The Fe abundance is positively correlated with that of Si when Si abundance is lower than 3 solar abundances, but a negative correlation appears when the Si abundance is higher. We suggest that such a two phase correlation is the results of different ways in which Fe is synthesized.

arXiv commentaccepted by ChJAA

References in corpus (20)

• Supernova Remnants in the Sedov Expansion Phase: Thermal X-Ray Emission
• Jet-Induced Explosions of Core Collapse Supernovae
• The Physics of Core-Collapse Supernovae
• Nucleosynthesis and Mixing in Cassiopeia A
• The Propagation and Eruption of Relativistic Jets from the Stellar Progenitors of GRBs
• A Million-Second Chandra View of Cassiopeia A
• Chandra Detection of the Forward and Reverse Shocks in Cassiopeia-A
• The Expansion Center and Dynamical Age of the Galactic Supernova Remnant Cassiopeia A
• On the Determination of Ejecta Structure and Explosion Asymmetry from the X-ray Knots of Cassiopeia A
• X-ray spectral imaging and Doppler mapping of Cassiopeia A
• Hydrodynamic Interaction of Strong Shocks with Inhomogeneous Media - I: Adiabatic Case
• Instabilities and Clumping in Type Ia Supernova Remnants
• Mapping the X-ray Emitting Ejecta in Cassiopeia A with Chandra
• Accelerated Electrons in Cassiopeia A: An Explanation for the Hard X-ray Tail
• Cassiopeia A: on the origin of the hard X-ray continuum and the implication of the observed O VIII Ly-alpha/Ly-beta distribution
• A Comparison of X-ray and Radio Emission from the Supernova Remnant Cassiopeia A
• X- and Gamma-ray Studies of Cas A: Exposing Core Collapse to the Core
• Explosive Nucleosynthesis Associated with Formation of Jet-induced GRBs in Massive Stars
• A Laboratory Investigation of Supersonic Clumpy Flows: Experimental Design and Theoretical Analysis
• An XMM-Newton Study of the Coronae of ${\sigma }^2$ Coronae Borealis

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• A Cr-K emission line survey in young supernova remnants with Chandra
• In-orbit calibration status of the Insight-HXMT
• Hints of a second explosion (a quark nova) in Cassiopeia A Supernova
• High Spatial Resolution Spectroscopy of G292.0+1.8 with Chandra
• Smoothed Particle Inference Analysis of SNR DEM L71
• Spatial Distribution of Metal Emissions in SNR 3C 397 Viewed with Chandra and XMM