Unusual flaring activity in the blazar PKS 1424−418 during 2008−2011

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dc.contributor.authorBuson, S.
dc.contributor.authorLongo, F.
dc.contributor.authorLarsson, S.
dc.contributor.authorCutini, S.
dc.contributor.authorFinke, J.
dc.contributor.authorCiprini, S.
dc.contributor.authorOjha, R.
dc.contributor.authorD'Ammando, F.
dc.contributor.authorDonato, D.
dc.contributor.authorThompson, D. J.
dc.contributor.authorDesiante, R.
dc.contributor.authorBastieri, D.
dc.contributor.authorWagner, S.
dc.contributor.authorHauser, M.
dc.contributor.authorFuhrmann, L.
dc.contributor.authorDutka, M.
dc.contributor.authorMüller, C.
dc.contributor.authorKadler, M.
dc.contributor.authorAngelakis, E.
dc.contributor.authorZensus, J. A.
dc.contributor.authorStevens, J.
dc.contributor.authorBlanchard, J. M.
dc.contributor.authorEdwards, P. G.
dc.contributor.authorLovell, J. E. J.
dc.contributor.authorGurwell, M. A.
dc.contributor.authorWehrle, A. E.
dc.contributor.authorZook, A.
dc.date.accessioned2020-05-08T14:18:17Z
dc.date.available2020-05-08T14:18:17Z
dc.date.issued2014-09-16
dc.description.abstractContext. Blazars are a subset of active galactic nuclei (AGN) with jets that are oriented along our line of sight. Variability and spectral energy distribution (SED) studies are crucial tools for understanding the physical processes responsible for observed AGN emission. Aims. We report peculiar behavior in the bright γ-ray blazar PKS 1424−418 and use its strong variability to reveal information about the particle acceleration and interactions in the jet. Methods. Correlation analysis of the extensive optical coverage by the ATOM telescope and nearly continuous γ-ray coverage by the Fermi Large Area Telescope is combined with broadband, time-dependent modeling of the SED incorporating supplemental information from radio and X-ray observations of this blazar. Results. We analyse in detail four bright phases at optical-GeV energies. These flares of PKS 1424−418 show high correlation between these energy ranges, with the exception of one large optical flare that coincides with relatively low γ-ray activity. Although the optical/γ-ray behavior of PKS 1424−418 shows variety, the multiwavelength modeling indicates that these differences can largely be explained by changes in the flux and energy spectrum of the electrons in the jet that are radiating. We find that for all flares the SED is adequately represented by a leptonic model that includes inverse Compton emission from external radiation fields with similar parameters. Conclusions. Detailed studies of individual blazars like PKS 1424−418 during periods of enhanced activity in different wavebands are helping us identify underlying patterns in the physical parameters in this class of AGN.en_US
dc.description.sponsorshipThe Fermi LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States, the Commissariat à l’Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucléaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase from the following agencies is also gratefully acknowledged: the Istituto Nazionale di Astrofisica in Italy and the K. A. Wallenberg Foundation in Sweden for providing a grant in support of a Royal Swedish Academy of Sciences Research fellowship for J.C. Part of this work was supported by the German Deutsche Forschungsgemeinschaft, DFG project number Ts 17/2–1. The Australian Long Baseline Array and the Australia Telescope Compact Array are part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. The Submillimeter Array is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academia Sinica. This research was funded in part by NASA through Fermi Guest Investigator grants NNH09ZDA001N and NNH10ZDA001N. This research was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. We thank Neil Gehrels and the Swift team for scheduling our Target of Opportunity requests. This research was enabled in part through Swift Guest Investigator grants 6090777. We thank Silvia Rainò for useful comments and suggestions.en_US
dc.description.urihttps://www.aanda.org/articles/aa/abs/2014/09/aa23367-14/aa23367-14.htmlen_US
dc.format.extent11 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2smsa-fpv4
dc.identifier.citationS. Buson et al., Unusual flaring activity in the blazar PKS 1424−418 during 2008−2011, A&A, 569 (2014) A40 DOI: https://doi.org/10.1051/0004-6361/201423367en_US
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201423367
dc.identifier.urihttp://hdl.handle.net/11603/18510
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2014A%26A...569A..40B
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2014A%26A...569A..40B
dc.identifier.urihttp://telbib.eso.org/detail.php?bibcode=2014A%26A...569A..40B
dc.language.isoen_USen_US
dc.publisherEDP sciencesen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.relation.ispartofUMBC Faculty Collection
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dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleUnusual flaring activity in the blazar PKS 1424−418 during 2008−2011en_US
dc.typeTexten_US

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