Show simple item record

dc.contributor.advisorChairperson, Graduate Committee: Sachiko Tsurutaen
dc.contributor.authorLiebmann, Andrew Cargillen
dc.date.accessioned2013-06-25T18:36:54Z
dc.date.available2013-06-25T18:36:54Z
dc.date.issued2010en
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/1730en
dc.description.abstractPresented is the detailed analysis of three Narrow Line Seyfert 1 galaxies using the method of dynamical spectral analysis. These are NGC 4051, IRAS F12397+3333 and Mrk 766. The highly variable NGC 4051 exhibits some dramatic changes over the course of two observations. These dramatic changes are attributed to a variable emission region being partially covered by a fixed, thick absorbing cloud. A unique time region was found where the emission region becomes smaller than the absorbing cloud. Source enters a true minimal phase and appears quite stable, appearing to "turn off." When in its lowest flux states NGC 4051 has a thermal plasma feature suggesting starburst activity in the nucleus. The possibility of starburst activity proves an important link in the understanding of the evolution of Active Galactic Nuclei. IRAS F12397+3333, a little studied source, was found to possess a complex, dusty, warm absorber spectrum of helium- and hydrogen-like carbon, nitrogen, oxygen, neon and several ionic species of iron. This is similar to the spectrum of IRAS 13349+2348. A two-phase gas was used to model this spectrum. The location of the gas is consistent with being located in the narrow line region. Two types of variability were found in the rapidly varying Mrk 766. The longterm variability and its associated spectral flattening seen in two observations are caused by a thick partially covering cloud and variable emission region. However the average spectral behavior shows partial covering of a thinner cloud. The result is a "lumpy cloud." When the source is dim a thicker portion of the clouds covers it, but as the source brightens and enlarges the thinner portion plays a more dominant role in the covering. The short, rapid variability is caused by the combination of a highly variable power law component and a stable reflected component, referred to here as ionized relativistic reflection. Finally, some unique flares were discovered. Unlike the other flares seen in the lightcurves, these occur only in the 0.3-2.0 keV band. They are attributed as a 'hot spot' on the accretion disk.en
dc.language.isoenen
dc.publisherMontana State University - Bozeman, College of Letters & Scienceen
dc.subject.lcshActive galaxiesen
dc.subject.lcshSeyfert galaxiesen
dc.subject.lcshX-raysen
dc.titleTemporal and dynamical spectral analysis of select narrow line Seyfert 1 galaxiesen
dc.typeDissertationen
dc.rights.holderCopyright 2010 by Andrew Cargill Liebmannen
thesis.catalog.ckey1606752en
thesis.degree.committeemembersMembers, Graduate Committee: Neil J. Cornish; Petrus Martens; John L. Carlsten; Charles C. Kankelborgen
thesis.degree.departmentPhysics.en
thesis.degree.genreDissertationen
thesis.degree.namePhDen
thesis.format.extentfirstpage1en
thesis.format.extentlastpage187en


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record


MSU uses DSpace software, copyright © 2002-2017  Duraspace. For library collections that are not accessible, we are committed to providing reasonable accommodations and timely access to users with disabilities. For assistance, please submit an accessibility request for library material.