Investigation of image errors in VLBI images of SN 1993J

Simple item page
dc.contributor.advisorBartel, Norbert
dc.contributor.advisorMcCall, Marshall
dc.contributor.advisorDe Robertis, Michael
dc.creatorKarimi, Bahman
dc.date.accessioned2016-09-13T13:13:10Z
dc.date.available2016-09-13T13:13:10Z
dc.date.copyright2013-10
dc.degree.disciplinePhysics And Astronomy
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstractAll deconvolved images from observational data obtained from very-long-baseline interferometry (VLBI) arrays are subject to image errors. They are caused by noise and incomplete sampling in the u-v plane. To investigate image errors we simulated data on the basis of VLBI observations of SN 1993J taken on 2007 Nov. 3. We computed the brightness distribution of a model of a supernova, calculated the visibility data of the model and made an image with the simulated data. The difference between model image and the image made with the simulated data indicates image errors. We found that image errors are larger by a factor~ 1.6 than the rms fluctuations of the background noise. We investigated the modulation of the brightness around the ridge of the shell and concluded that brightness variations are significant for the 2007 observations and also for those made in 1996, 1997 and 2010.
dc.identifier.urihttp://hdl.handle.net/10315/31909
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subject.keywordsvery-long-baseline interferometry
dc.subject.keywordsVLBI
dc.subject.keywordsSN 1993J
dc.subject.keywordsimage errors
dc.subject.keywordsstars
dc.titleInvestigation of image errors in VLBI images of SN 1993J
dc.typeElectronic Thesis or Dissertation

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Karimi_Bahman_2014_Masters.pdf
Size:
8.24 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
license.txt
Size:
1.83 KB
Format:
Plain Text
Description:
Download
No Thumbnail Available
Name:
YorkU_ETDlicense.txt
Size:
3.36 KB
Format:
Plain Text
Description:
Download

Collections

Physics and Astronomy

All items in the YorkSpace institutional repository are protected by copyright, with all rights reserved except where explicitly noted.