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Hints of an axion-like particle mixing in the GeV gamma-ray blazar data?

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Hints of an axion-like particle mixing in the GeV gamma-ray blazar data?

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dc.contributor.author Mena Requejo, Olga
dc.contributor.author Razzaque, Soebur
dc.date.accessioned 2014-02-20T09:26:05Z
dc.date.available 2014-11-11T09:26:05Z
dc.date.issued 2013
dc.identifier.citation Mena Requejo, Olga Razzaque, S. 2013 Hints of an axion-like particle mixing in the GeV gamma-ray blazar data? Journal Of Cosmology And Astroparticle Physics 11 11 023
dc.identifier.uri http://hdl.handle.net/10550/33115
dc.description.abstract Axion-Like Particles (ALPs), if exist in nature, are expected to mix with photons in the presence of an external magnetic field. The energy range of photons which undergo strong mixing with ALPs depends on the ALP mass, on its coupling with photons as well as on the external magnetic field and particle density configurations. Recent observations of blazars by the Fermi Gamma-Ray Space Telescope in the 0.1-300 GeV energy range show a break in their spectra in the 1-10 GeV range. We have modeled this spectral feature for the flat-spectrum radio quasar 3C454.3 during its November 2010 outburst, assuming that a significant fraction of the gamma rays convert to ALPs in the large scale jet of this blazar. Using theoretically motivated models for the magnetic field and particle density con figurations in the kiloparsec scale jet, outside the broad-line region, we find an ALP mass m(a) similar to (1 ¿ 3).10(-7) eV and coupling g(a gamma) similar to (1 ¿ 3).10(-10) GeV-1 after performing an illustrative statistical analysis of spectral data in four different epochs of emission. The precise values of m(a) and g(a gamma) depend weakly on the assumed particle density con figuration and are consistent with the current experimental bounds on these quantities. We apply this method and ALP parameters found from fitting 3C454.3 data to another flat-spectrum radio quasar PKS1222+216 (4C+21.35) data up to 400 GeV, as a consistency check, and found good fit. We find that the ALP-photon mixing effect on the GeV spectra may not be washed out for any reasonable estimate of the magnetic field in the intergalactic media.
dc.relation.ispartof Journal Of Cosmology And Astroparticle Physics, 2013, vol. 11, num. 11, p. 023
dc.subject Partícules (Física nuclear)
dc.subject Astrofísica
dc.subject Cosmologia
dc.title Hints of an axion-like particle mixing in the GeV gamma-ray blazar data?
dc.type journal article es_ES
dc.date.updated 2014-02-20T09:26:05Z
dc.identifier.doi 10.1088/1475-7516/2013/11/023
dc.identifier.idgrec 093160
dc.rights.accessRights open access es_ES
dc.identifier.url 10.1088/1475-7516/2013/11/023

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