The spectral and temporal variability of the isolated X-ray pulsar RX J0720.4-3125 = Untersuchung der spektralen und zeitlichen Variabilität des isolierten Röntgenpulsars RX J0720.4-3125 [[Elektronische Ressource]] / Markus Matthias Hohle. Gutachter: Ralph Neuhäuser ; Joachim Trümper ; Fred Walter

The spectral and temporal variabilityof the isolated X-ray pulsarRX J0720.4-3125Untersuchung der spektralen und zeitlichenVariabilitat des isolierten R ontgenpulsarsRX J0720.4-3125A thesis submitted for the degree ofdoctor rerum naturalium (Dr. rer. nat.)th2010 September 29presented to the council of the Physikalisch-Astronomische Fakultat derFriedrich-Schiller-Universitat JenaDipl. Phys. Markus Matthias Hohlethborn on November 12 1982 in P o neck, Thuringia, GermanyMax-Planck-Institut fur extraterrestrische Physik, Garching, GermanyAstrophysikalisches Institut und Universitatssternwarte derFriedrich-Schiller-Universitat, Jena, Germany1. Reviewer: Prof. Dr. Ralph Neuhauser2. Reviewer: Prof. Dr. Joachim Trump er (Co-referent)3. Reviewer: Prof. Dr. (USA) Fred WalterDay of the defense: January, 27th 2011Signature from head of PhD committee:AbstractThe radio-quiet thermally emitting X-ray pulsar RX J0720.4 3125 belongs toa group of seven isolated neutron stars (often referred to as the \Magni centSeven"). They share similar properties such as pure thermal radiation (blackbody emission with broad absorption features in some cases), long pulse peri-13ods (3 12 s) and high magnetic eld strengths ( B 10 Gauss) on theirsurfaces. These neutron stars are nearby ( 500 pc) and up to a few millionyears old (i.e. relatively young and still hot), thus, most of them have beenidenti ed with dim ( 25 28 mag) blue optical counterparts.RX J0720.