Measurement of the perseus cluster gamma-ray spectrum

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dc.contributor.advisorHaymes, Robert C.en_US
dc.creatorWalraven, Daviden_US
dc.date.accessioned2018-12-18T21:16:55Zen_US
dc.date.available2018-12-18T21:16:55Zen_US
dc.date.issued1976en_US
dc.description.abstractOn May 15, 1973 a balloon-borne gamma-ray telescope belonging to the Rice University Gamma-Ray Astronomy Group was launched from Palestine, Texas. Both source and background segment counting rates were measured over the 56 keV to 12.4 MeV energy range from 118 CDT to 1313 CDT. In each of the source segments, the detector was pointed at the Seyfert galaxy NGC 1275 in the Perseus cluster. However the entire cluster was within the field of view of the detector during the observations of this galaxy. The experiment was carried out at altitudes corresponding to a residual atmospheric depth of approximately 4 gm/cm. The detector consisted of a central crystal of Nal (Tl) which was actively collimated by a shield of the same material. The instrument had a beam width of 13° full width half maximum. The results obtained show that NGC 1275 in particular and the Perseus cluster in general do not constitute a detectable gamma-ray source. A series of upper limits to the flux in the 56 keV to 12.4 MeV energy range was computed.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent136 ppen_US
dc.identifier.callnoThesis Sp. Sci. 1976 Walravenen_US
dc.identifier.citationWalraven, David. "Measurement of the perseus cluster gamma-ray spectrum." (1976) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104065">https://hdl.handle.net/1911/104065</a>.en_US
dc.identifier.digitalRICE1691en_US
dc.identifier.urihttps://hdl.handle.net/1911/104065en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleMeasurement of the perseus cluster gamma-ray spectrumen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentSpace Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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