Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012

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dc.contributor.authorDutka, Michael S.
dc.contributor.authorCarpenter, Bryce D.
dc.contributor.authorOjha, Roopesh
dc.contributor.authorFinke, Justin D.
dc.contributor.authorD'Ammando, Filippo
dc.contributor.authorKadler, Matthias
dc.contributor.authorEdwards, Philip G.
dc.contributor.authorStevens, Jamie
dc.contributor.authorTorresi, Eleonora
dc.contributor.authorGrandi, Paola
dc.contributor.authorNesci, Roberto
dc.contributor.authorKrauß, Felicia
dc.contributor.authorMüller, Cornelia
dc.contributor.authorWilms, Joern
dc.contributor.authorGehrels, Neil
dc.date.accessioned2020-04-20T12:52:39Z
dc.date.available2020-04-20T12:52:39Z
dc.date.issued2017-02-01
dc.description.abstractQuasi-simultaneous observations of the Flat Spectrum Radio Quasar PKS 2326−502 were carried out in the γ-ray, X-ray, UV, optical, near-infrared, and radio bands. Using these observations, we are able to characterize the spectral energy distribution (SED) of the source during two flaring and one quiescent γ-ray states. These data were used to constrain one-zone leptonic models of the SEDs of each flare and investigate the physical conditions giving rise to them. While modeling one flare required only changes in the electron spectrum compared to the quiescent state, modeling the other flare required changes in both the electron spectrum and the size of the emitting region. These results are consistent with an emerging pattern of two broad classes of flaring states seen in blazars. Type 1 flares are explained by changes solely in the electron distribution, whereas type 2 flares require a change in an additional parameter. This suggests that different flares, even in the same source, may result from different physical conditions or different regions in the jet.en_US
dc.description.sponsorshipThis research was funded in part by NASA through Fermi Guest Investigator grants NNH09ZDA001N, NNH10ZDA001N, and NNH12ZDA001N. 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. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. The Australia Telescope Compact Array is part of the Australia Telescope National Facility, which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. This research has made use of data from the NASA/IPAC Extragalactic Database (NED), operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration; and the SIMBAD database (operated at CDS, Strasbourg, France). This research has made use of NASA’s Astrophysics Data System. This research has made use of the United States Naval Observatory (USNO) Radio Reference Frame Image Database (RRFID). This paper has made use of up-to-date SMARTS optical/near-infrared light curves that are available at http://www.astro.yale.edu/smarts/glast/home.php. F.K. acknowledges funding from the European Unions Horizon 2020 research and innovation programme under grant agreement No 653477. The 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 KA Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d’Études Spatiales in France.en_US
dc.description.urihttps://iopscience.iop.org/article/10.3847/1538-4357/835/2/182en_US
dc.format.extent10 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2ivxt-3fcc
dc.identifier.citationMichael S. Dutka, Bryce D. Carpenter, Roopesh Ojha, Justin D. Finke, Filippo D'Ammando, Matthias Kadler, Philip G. Edwards, Jamie Stevens, Eleonora Torresi, Paola Grandi, Roberto Nesci, Felicia Krauß, Cornelia Müller, Joern Wilms, and Neil Gehrels, Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012 ,American Astronomical Society, Vol 835 #2, https://doi.org/10.3847%2F1538-4357%2F835%2F2%2F182en_US
dc.identifier.urihttps://doi.org/10.3847%2F1538-4357%2F835%2F2%2F182
dc.identifier.urihttp://hdl.handle.net/11603/18132
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2017ApJ...835..182D
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2017ApJ...835..182D
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2017ApJ...835..182D
dc.identifier.urihttps://irsa.ipac.caltech.edu/bibdata/2017/D/2017ApJ...835..182D.html
dc.language.isoen_USen_US
dc.publisherIOPen_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
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dc.titleMultiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012en_US
dc.typeTexten_US

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