Low-energy gamma radiation from Cen. X-4

dc.contributor.advisorHaymes, Robert C.en_US
dc.creatorJohnson, Wiley Neil, 1945-en_US
dc.date.accessioned2016-04-22T22:00:56Zen_US
dc.date.available2016-04-22T22:00:56Zen_US
dc.date.issued1972en_US
dc.description.abstractIn July of 1969 a new X-ray source was detected in the southern sky near the constellation Centaurus. This source, identified as Centaurus X-4, displayed a variable intensity in the energy range 3 to 12 keV which at its maximum was more than twice as great as that from Sco X-l, the brightest discrete extrasolar X-ray source in the sky. A balloon-borne gamma-ray detector was launched from Parana, Argentina, on November 26, 1969, in an effort to measure the high-energy spectrum from this transient X-ray source. Due to partial failure of the instrument midway through the flight, the full sensitivity of the actively collimated Nal(Tl) detector was not achieved. This complication, coupled with the apparent time variation of the source, allowed only upper limits to be placed on the high-energy flux from this object in the range 80 keV to 2 MeV. As a result of this flight, the first high-altitude balloon research from Argentina, comparisons of Cen X-4 with other nova-like X-ray sources may be made. In addition, useful information on the response of actively collimated scintillation detectors to gamma radiation under varied conditions may he determined. The atmospheric gamma-ray background over Argentina, as well as the facilities avail able in Parana, proved to be ideal for southern hemisphere balloon research. In 1970 and 1971 two more successful expeditions to Argentina were made which produced valuable new data on various southern hemisphere celestial X-ray objects.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent113 ppen_US
dc.identifier.callnoThesis SP.SCI. 1972 Johnsonen_US
dc.identifier.citationJohnson, Wiley Neil, 1945-. "Low-energy gamma radiation from Cen. X-4." (1972) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/90357">https://hdl.handle.net/1911/90357</a>.en_US
dc.identifier.digitalRICE1394en_US
dc.identifier.urihttps://hdl.handle.net/1911/90357en_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.titleLow-energy gamma radiation from Cen. X-4en_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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