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Modeling of shocks in young and old supernova remnants.

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Call No.	QB841 .P38 2005
Author	Patnaude, Daniel James.
Title	Modeling of shocks in young and old supernova remnants.
Date	2005
Abstract	We present results from a modeling effort of simple shock phenomena in the Cygnus Loop and Cassiopeia A. Using multi-epoch MDM observations of a small, isolated cloud in the southwest region of the Cygnus Loop, we measure the velocity of the Balmer-dominated shock filaments as well as the velocity of the internal cloud shock. These results are used to constrain the primary parameter for interstellar clouds: the density contrast between the cloud and the interstellar medium. These results are used to present models for a strong shock interacting with a lumpy, but diffuse cloud. This model represents a refinement over previous shock-cloud models. Using multi-epoch X-ray observations of the Cassiopeia A supernova remnant, we investigate a small bow shock which protrudes north of the identified forward shock front. Proper motion estimates for this object, combined with a spectral analysis suggest that the object is a bullet of ejecta, similar to those found in Vela. Model results are presented which show the evolution of an ejecta bullet across the SNR. These simulations suggest that bullet ejecta could arise in Cas A, and that the bullet material could survive the turbulent journey through shocked ejecta. Finally, preliminary results from a study of the reverse shock structure in Cas A are presented. We present regions which show decaying fluxes over a four year period, but also show an increase in X-ray line emission, suggesting that the gas in these regions is approaching ionization equilibrium. Models for reverse shock formation and the reverse shock-ejecta interaction are discussed.
Description	xxiii, 239 leaves : ill.(some col.) 28 cm.
Format	application/pdf
Subject	Supernova remnants. Shock waves -- Mathematical models. Interstellar matter.
College	Dartmouth College -- Department of Physics and Astronomy.
Issuing Body	Dartmouth Dissertations are made available through the Dartmouth Digital Library.
Degree	Thesis (Ph.D.)--Dartmouth College.
Copyright	All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means without permission in writing from the author.
DOI	http://dx.doi.org/10.1349/ddlp.91

Title	Page 1
Format	application/pdf
Issuing Body	Dartmouth Dissertations are made available through the Dartmouth Digital Library.
Degree	Thesis (Ph.D.)--Dartmouth College.
Full Text	Modeling of Shocks in Young and Old Supernova Remnants A Thesis Submitted to the Faculty in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Physics and Astronomy by Daniel James Patnaude DARTMOUTH COLLEGE Hanover, New Hampshire 29 March 2005 Examining Committee: Prof. Robert A. Fesen Prof. Brian Chaboyer Prof. Mary Hudson Dr. John Raymond Charles Barlowe Dean of Graduate Studies

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Modeling of shocks in young and old supernova remnants.

Modeling of shocks in young and old supernova remnants.