Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt........18h&link_type=abstract
Ph.D dissertation, 2004. 142 pages; United States -- Arizona: The University of Arizona; 2004. Publication Number: AAT 3145077.
Physics
Gamma-Ray Lines, Supernovae, X-Ray Spectra, High-Energy Emissions
Scientific paper
High energy emission from supernovae provide a direct window into the quantity and distribution of radioactive elements produced in these explosions. Combining supernova explosion calculations with 3D Monte Carlo g-ray transport, I have studied the effect mixing and asymmetries have on the hard X-ray and g- ray spectra. Two types of asymmetries (bipolar and unipolar) are investigated, the parameters of which are motivated by the most recent findings from multi- dimensional core-collapse supernova simulations. These bipolar and unipolar asymmetries are imposed artificially on 1-dimensional stellar progenitor structures and their evolution is followed using a 3-dimensional smoothed particle hydrodynamics (SPH) code. Global asymmetries in the explosion enhance the outward mixing of heavy elements such as 56 Ni, reducing the observable emergence time for the hard X-ray continuum and g-ray line emission over that of symmetrically mixed models. The details of the velocity asymmetry lead to very different nickel distributions in the outer envelope. The high energy spectra resulting from these models predict an angular variation for the correspondence between the emergence time of the hard X-ray continuum and the broadening of the g-line profiles. The unipolar explosion models, in particular, demonstrate that redshifted g-ray line profiles are attainable at epochs where g-ray emission arises predominantly from the outer extent of the nickel distribution. The departure from a symmetric explosion scenario manifests itself most clearly in the extended nickel, making g-ray line observations an ideal probe of the initial explosion asymmetry.
No associations
LandOfFree
Gamma-ray lines from asymmetric supernovae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Gamma-ray lines from asymmetric supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gamma-ray lines from asymmetric supernovae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1638905