Contribution to individual blazar spectrum from the cascade of very-high energy gamma rays

dc.contributor.advisor Frank Krennrich
dc.contributor.author Fang, Ke
dc.contributor.department Physics and Astronomy
dc.date 2018-08-11T07:20:04.000
dc.date.accessioned 2020-06-30T02:35:51Z
dc.date.available 2020-06-30T02:35:51Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 2010
dc.date.embargo 2013-06-05
dc.date.issued 2010-01-01
dc.description.abstract <p>As Very High Energy (VHE) photons travel through the extragalactic background light (EBL), they will interact and generate electron and positron pairs via pair production. The newly produced electrons and positrons will Inverse-Compton scatter the background soft photons to secondary gamma-rays in the process of electromagnetic cascading. The intensity of a cosmological population emitting at VHEs will be attenuated at the highest energies due to absorption and enhanced at lower energies by the resulting cascade. We calculate the cascade radiation created by VHE photons produced by blazars and investigate the effects of cascades on the observed intensity of individual blazars. We find that the cascade radiation greatly enhances the observed intensity at the observational energy range. The prominence of the resulting features depends on the intrinsic spectral index and the location of the source. We</p> <p>additionally calculate the cascade radiation from several sources with distinct spectral index and cosmological positions. Finally, we discuss the implications that this analysis could have for the prediction of sourse spectrum with the observational data from VERITAS and FERMI.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/11461/
dc.identifier.articleid 2485
dc.identifier.contextkey 2807683
dc.identifier.doi https://doi.org/10.31274/etd-180810-2777
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/11461
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/25667
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/11461/Fang_iastate_0097M_11275.pdf|||Fri Jan 14 18:50:39 UTC 2022
dc.subject.disciplines Physics
dc.subject.keywords 1ES1218+304
dc.subject.keywords blazar
dc.subject.keywords intrinsic spectrum
dc.subject.keywords Markarian 421
dc.title Contribution to individual blazar spectrum from the cascade of very-high energy gamma rays
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
thesis.degree.level thesis
thesis.degree.name Master of Science
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