search for very high energy gamma ray emission from Hercules X-1

dc.contributor.author Kelley, Linda Ann en_US
dc.date.accessioned 2009-07-15T18:07:38Z
dc.date.available 2009-07-15T18:07:38Z
dc.date.issued 1991 en_US
dc.description Typescript. en_US
dc.description Thesis (Ph. D.)--University of Hawaii at Manoa, 1991. en_US
dc.description Includes bibliographical references (leaves 210-213) en_US
dc.description Microfiche. en_US
dc.description xvi, 213 leaves, bound ill. 29 cm en_US
dc.description.abstract Data from the Haleakala Gamma-ray Observatory taken during 1987 and 1989 is searched for the presence of TeV Gamma-rays from r he direction of Hercules X-1. These two data sets were compiled on two different instruments: the first in operation from 1985 through the end of 1987 and the second, upgraded instrument in operation from early 1989 to the present. After the initial data selection and calibration, the two data segments were analyzed for periodicity near the interpolated pulse period, a counting rate (or DC) excess during short intervals, and an integrated DC excess over longer periods of time. The 1987 data set revealed one interval of significant periodicity. The detected period, 1.23578 ±0.00020, s, is not in agreement with the expected X-ray pulse period, but it is in agreement with periodicity observed from Her X-1 by several groups during 1986 in the TeV - PeV energy range. No significant rate excess was observed during this interval. A integrated DC excess calculation was not possible on these data because of the mode in which the data were taken. The 1989 data set contained no periodicity; however, an integrated excess corresponding to two of the three high on X-ray intervals during which data was taken was observed. The overall flux observed during this year was (5.9 ± 2.6) X 10^-11 cm^-2s^-1 above 0.15 TeV. No significant short (15 minute) bursts of VHE gamma-rays were detected in this data set. en_US
dc.identifier.uri http://hdl.handle.net/10125/10076
dc.language.iso en-US en_US
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Physics; no. 2635 en_US
dc.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. en_US
dc.subject Gamma ray astronomy en_US
dc.subject Hercules X-1 en_US
dc.title search for very high energy gamma ray emission from Hercules X-1 en_US
dc.type Thesis en_US
dc.type.dcmi Text en_US
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