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Showing 1 to 20 of 31 for “"Supernova Remnants"”.
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The Evolution of Supernova Remnants
Made available in DSpace on 2014-12-09T18:34:00Z (GMT). No. of bitstreams: 1 6910695.pdf: 3988851 bytes, checksum: df2bd7f2ab59f08760d7bc0c6a0a35dc (MD5) Previous issue date: 1968
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X-ray studies of supernova remnants
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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X-ray Properties of Galactic Supernova Remnants
… in der ROSAT Himmelsdurchmusterung (RASS) als Supernova Ueberreste (SNRs) Kandidaten identifiziert (Busser, 1998). Ein Ziel der vorliegenden Arbeit war die genaue Untersuchung und Identifizierung dieser Galaktischen SNR Kandidaten an Hand ihrer Roentgen- und Radiomorphologie. Diese Analyse …
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Supernova Remnants in the Large Magellanic Cloud
… multiwavelength analyses for individual LMC remnants. In one case study I have examined DEM L 316, which appears to consist of two overlapping shells. Using the correlation of optical and X-ray morphologies, the velocity profile, and the magnetic field in the overlapping region area, I have …
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Meshless hydrodynamic simulations of young supernova remnants
… ejecting their outer envelopes in a corecollapse supernova explosion. The collision of their ejecta with the surrounding circumstellar medium results in the formation of supernova remnants that have been detected at all wavelengths, from radio to gamma-rays. For several dozen supernova remnants, …
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A Survey of the Properties of Supernova Remnants
Made available in DSpace on 2014-12-10T23:45:13Z (GMT). No. of bitstreams: 1 7317478.pdf: 7080493 bytes, checksum: 16f00905b501dd6c51b4bd482bb8f816 (MD5) Previous issue date: 1972
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Constraining the Magneto-Ionic Environment of Galactic Supernova Remnants
… focuses on applying a similar technique to supernova remnants (SNRs), extended sources of polarised emission in our Galaxy, in order to determine `anchor points' of the GMF where the 3-dimensional magnetic field can be found. I refined existing work using SNRs to develop techniques of …
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Numerical modeling of radio emission from young supernova remnants
Young supernova remnants such as Tycho, Kepler, and Cas A generally show a circular, clumpy shell near the outer boundary in both radio and X-ray emission. The magnetic field in the radio shell has been inferred to be in the range of $10\sp{-4}\sim10\sp{-3}G$ by the minimum energy requirements. The …
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Using Polarised HI Absorption to Estimate Distances to Supernova Remnants
Supernova remnants are the aftermath of the explosions of stars. In the study of Galactic supernova remnants, distance measurements are a vital supplement to astronomical observations. While in general, the angular extent and surface brightness of a supernova remnant are readily observed, knowledge …
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A study of the infrared emission of galactic supernova remnants
… the nature of the infrared (IR) emission of supernova remnants (SNRs), and to use this radiation to reveal the physical properties of SNRs and the gas and dust they contain. This project has been made possible only recently, following the success of the Infrared Astronomical Satellite (IRAS) …
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RADIO STUDY OF SUPERNOVA REMNANTS: UNDERSTANDING THE MISSING SUPERNOVA REMNANT PROBLEM
… the observed and predicted numbers of Galactic supernova remnants (SNRs), likely due to observational biases that hinder the detection of old, faint, large remnants, as well as very young, small remnants, caused by poor sensitivity and spatial resolution. The goal of this thesis is to address …
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XMM-Newton Survey of the Brightest Supernova Remnants in the Large Magellanic Cloud
<p>Therefore, a realistic understanding of SN contribution from SNRs populations is needed to model the evolution of a galaxy.</p>
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High-resolution studies of charge exchange in supernova remnants with Magellan, XMM-Newton, and Micro-X
… on a cold, at least partially neutral gas. Supernova remnants, especially in the immediate shock region, provide conditions conducive to charge exchange. The emission from post charge-exchange ions as the captured electron cascades down to the ground state, can shed light on the physical …
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Gamma-ray studies of the young shell-type SNR RX J1713.7-3946
… the knee there seems to be a wide consensus that supernova remnants are the most likely candidates. Evidence of this comes from observations of non-thermal X-ray radiation, requiring synchrotron electrons with energies up to 1014 eV, exactly in the remnant of supernovae. To date, however, there is …
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Particle-in-cell simulations of perpendicular supernova shock fronts
… allows us to arrive at the conclusion that supernova remnants are our main suspect for the origin of galactic cosmic rays. The mechanism by which they are accelerating particles is found within the field of shock physics as diffusive shock acceleration. To allow particles to enter this …
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Investigating the cosmic-ray ionization rate in the galactic interstellar medium through observations of H3+
… clouds known to be interacting with the supernova remnant IC 443, a probable site of particle acceleration. Where H3+ is detected, ionization rates of zeta_2=(20+-10)x10^-16 s^-1 are inferred, higher than for any other diffuse cloud. These results support both the concept that supernova …
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Imaging X-ray spectroscopy with micro-X and Chandra
… spectra, using gratings. Extended objects like supernova remnants cannot be dispersed, leaving the dense forest of emission lines blended by the moderate resolution of modern instruments. In the first half of this thesis, I undertake two investigations of the supernova remnant Cassiopeia A using …
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The distributions of stellar remnants in disk galaxies
… an account of work on the distribution of supernova remnants in galaxies. It consists of 3 parts, the identification of runaway stars in galaxies and then the modelling of the expected distribution of these stars around a galaxy and their expected dispersion over time. The first part of the …
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Rayleigh—Taylor-Instability Evolution in Colliding-Plasma-Jet Experiments with Magnetic and Viscous Stabilization
… confinement fusion implosions to parsec-scale supernova remnants. The evolution of this interchange instability in a plasma is influenced by the presence of viscosity and magnetic fields, both of which have the potential to stabilize short-wavelength modes. Very few experimental observations of …
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