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Showing 1 to 20 of 130 for “"Supernova"”.
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The core collapse supernova rate in the sdss-ii supernova survey
<p>The Sloan Digital Sky Survey II Supernova Survey (SDSS-II SN), though designed as a type Ia supernova search for cosmology, also discovered a large sample of core collapse supernovae (CCSN). I use the SDSS-II SN data to measure the volumetric CCSN rate in the redshift range (0.03 < z < 0.09), …
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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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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
In addition, I have included two specific case studies, comprised of detailed 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 …
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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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Penetration of supernova radioactivities in the solar system
"We investigate the mechanism by which supernova ejecta can penetrate the solar system, and in particular, directly deposit live radioactivities on Earth. This study is motivated by the discovery of live undersea 60Fe from an event 2.8 Myr ago. The 60Fe signal is consistent with a nearby supernova …
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The Impact of Peculiar Velocities on Supernova Cosmology
… cosmological parameters calculated using type Ia supernovae. We use mock galaxy catalogues constructed from the Millennium Simulation, the largest dark matter N-body simulation run to date. Supernovae are assigned to the galaxies in the mock survey data according to supernova rates that define the …
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Supernova Rates, Rise-Ttmes and their Relations to Progenitors
Supernovae are fundamental in astronomy: they inject high mass elements into the interstellar medium enriching the chemistry of galaxies, they feed processes of star formation and active galactic nuclei, and they have been a key for the developments in cosmology of the past decades. This …
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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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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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Novel methods of supernova classification and type probability estimation
… photometric surveys will provide vastly more supernovae than have presently been observed, the majority of which will not be spectroscopically typed. Key to extracting information from these future datasets will be the efficient use of light-curves. In the first part of this thesis we …
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A 3-dimensional analysis of the Cassiopeia a supernova remnant.
We present a multi-wavelength study of the nearby supernova remnant Cassiopeia A (Cas A). Easily resolvable supernova remnants such as Cas A provide a unique opportunity to test supernova explosion models. Additionally, we can observe key processes in the interstellar medium as the ejecta from the …
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Supernova-driven turbulence and magnetic field amplification in disk galaxies
Supernovae are known to be the dominant energy source for driving turbulence in the interstellar medium. Yet, their effect on magnetic field amplification in spiral galaxies is still poorly understood. Analytical models based on the uncorrelated-ensemble approach predicted that any created field …
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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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Supernova shrapnel: nearby supernovae and dust transport in the ISM
… extending previous analyses of Core-Collapse Supernovae (CCSNe) to include Electron-Capture Supernovae (ECSNe), Super-Asymptotic Giant Branch (SAGBs) stars, Thermonuclear/Type Ia Supernovae (TNSNe), and Kilonovae/Neutron Star Mergers (KNe). We revisit previous estimates of the ^60Fe and ^26Al …
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