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dc.contributor.advisor Haymes, Robert C.
dc.creatorMoss, Michael Jamieson
dc.date.accessioned 2009-06-04T06:49:30Z
dc.date.available 2009-06-04T06:49:30Z
dc.date.issued 1997
dc.identifier.urihttps://hdl.handle.net/1911/19190
dc.description.abstract Results of spectral analysis and time series analysis of the transient source x-ray nova Velorum 1993 (GRS 1009-45) and x-ray nova Ophicuhus 1993 (GRS 1716-249) are presented. These data were accumulated using the OSSE (Oriented Scintillation Spectrometer Experiment) low-energy gamma ray telescope on the Compton Gamma Ray Observatory. Spectral observations of the two x-ray novae showed the presence of gamma ray emission to greater than 100 keV, which is thought to be a signature of a binary system with an accreting black hole. Observations of GRS 1009-45 shows that it was in a gamma-ray soft state during the one-day OSSE observation, which occurred during the exponential decay phase of the outburst. The spectrum of GRS 2716-249 acquired during the plateau stage of outburst indicated a hard state, while spectra acquired during the sawtooth outbursts suggest that a hard to soft transition occurs as the decay progresses. The 40-200 keV pre-outburst luminosity of GRS 1716-249 is shown to be two orders of magnitude less than that estimated during the plateau-stage observation. The only significant power density spectrum was that acquired for GRS 1716-249 during the plateau stage of outburst. It is consistent with the sum of two QPO peaks at 0.128 and 0.32 Hz and a red noise ($\nu\sp{-1}$) component. This power spectrum is consistent with other black hole candidate power spectra for which the source is in the low state. Power spectra for GRS 1009-45 and GRS 1716-249 during the peak of a sawtooth outburst are also presented. They are consistent with band-limited white noise. Corresponding autocorrelations are shown for all observations.
dc.format.extent 141 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectAstronomy
Astrophysics
Radiation
dc.title Gamma ray observations of black hole candidates nova Ophiuchus 1993 and nova Velorum 1993
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Physics
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy
dc.identifier.citation Moss, Michael Jamieson. "Gamma ray observations of black hole candidates nova Ophiuchus 1993 and nova Velorum 1993." (1997) Diss., Rice University. https://hdl.handle.net/1911/19190.


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