Detection of a Gamma-Ray Flare from the High-redshift Blazar DA 193

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dc.contributor.authorPaliya, Vaidehi S.
dc.contributor.authorAjello, M.
dc.contributor.authorOjha, R.
dc.contributor.authorAngioni, R.
dc.contributor.authorCheung, C. C.
dc.contributor.authorTanada, K.
dc.contributor.authorPursimo, T.
dc.contributor.authorGalindo, P.
dc.contributor.authorLosada, I. R.
dc.contributor.authorSiltala, L.
dc.contributor.authorDjupvik, A. A.
dc.contributor.authorMarcotulli, L.
dc.contributor.authorHartmann, D.
dc.date.accessioned2020-04-01T12:28:59Z
dc.date.available2020-04-01T12:28:59Z
dc.date.issued2019-02-01
dc.description.abstractHigh-redshift (z > 2) blazars are the most powerful members of the blazar family. Yet, only a handful of them have both X-ray and γ-ray detection, thereby making it difficult to characterize the energetics of the most luminous jets. Here, we report, for the first time, the Fermi-Large Area Telescope detection of the significant γ-ray emission from the high-redshift blazar DA 193 (z = 2.363). Its time-averaged γ-ray spectrum is soft (γ-ray photon index = 2.9 ± 0.1), and together with a relatively flat hard X-ray spectrum (14–195 keV photon index = 1.5 ± 0.4), DA 193 presents a case to study a typical high-redshift blazar with inverse Compton peak being located at MeV energies. An intense GeV flare was observed from this object in the first week of 2018 January, a phenomenon rarely observed from high-redshift sources. What makes this event a rare one is the observation of an extremely hard γ-ray spectrum (photon index = 1.7 ± 0.2), which is somewhat unexpected because high-redshift blazars typically exhibit a steep falling spectrum at GeV energies. The results of our multifrequency campaign, including both space- (Fermi, NuSTAR, and Swift) and ground-based (Steward and Nordic Optical Telescope) observatories are presented, and this peculiar γ-ray flare is studied within the framework of a single-zone leptonic emission scenario.en_US
dc.description.sponsorshipWe thank the anonymous referees for useful suggestions on the manuscript. We are grateful to NuSTAR and Swift PIs for approving the ToO observations and to the mission operation teams for quickly executing them. We also thank P. Smith (Steward observatory) for considering our request of observations. V.S.P. acknowledges funding under NASA contracts 80NSSC17K0310 and 80NSSC18K0580. R.A. is a member of the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne. 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 NASA 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 is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d’Études Spatiales in France. This work performed in part under DOE Contract DE- AC02-76SF00515. This work made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). This research has made use of the XRT Data Analysis Software (XRTDAS). This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. This research has made use of data obtained through the High Energy Astrophysics Science Archive Research Center Online Service, provided by the NASA/Goddard Space Flight Center. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Part of this work is based on archival data, software or online services provided by the ASI Data Center (ASDC). Data from the Steward Observatory spectropolarimetric monitoring project were used. This program is supported by Fermi Guest Investigator grants NNX08AW56G, NNX09AU10G, NNX12AO93G, and NNX15AU81G.en_US
dc.description.urihttps://iopscience.iop.org/article/10.3847/1538-4357/aafa10en_US
dc.format.extent12 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m23aot-ktfq
dc.identifier.citationVaidehi S. Paliya, M. Ajello, R. Ojha, R. Angioni, C. C. Cheung, K. Tanada, T. Pursimo, P. Galindo, I. R. Losada, L. Siltala, A. A. Djupvik, L. Marcotulli, and D. Hartmann, Detection of a Gamma-Ray Flare from the High-redshift Blazar DA 193, https://iopscience.iop.org/article/10.3847/1538-4357/aafa10
dc.identifier.urihttp://hdl.handle.net/11603/17784
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dc.identifier.urihttps://irsa.ipac.caltech.edu/bibdata/2019/P/2019ApJ...871..211P.html
dc.identifier.urihttps://heasarc.gsfc.nasa.gov/xamin/xamin.jsp?bibcode=2019ApJ%2E%2E%2E871%2E%2E211P
dc.language.isoen_USen_US
dc.publisherIOPen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
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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.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.titleDetection of a Gamma-Ray Flare from the High-redshift Blazar DA 193en_US
dc.typeTexten_US

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