X-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275

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dc.contributor.authorFukazawa, Yasushi
dc.contributor.authorShiki, Kensei
dc.contributor.authorTanaka, Yasuyuki
dc.contributor.authorItoh, Ryosuke
dc.contributor.authorTakahashi, Hiromitsu
dc.contributor.authorImazato, Fumiya
dc.contributor.authorDutka, Filippo
dc.contributor.authorOjha, Roopesh
dc.contributor.authorNagai, Hiroshi
dc.date.accessioned2020-05-11T14:00:08Z
dc.date.available2020-05-11T14:00:08Z
dc.date.issued2018-03-12
dc.description.abstractWe analyzed Suzaku/XIS data (2006–2015) and Fermi/LAT data (2008–2015) of the gamma-ray emitting radio galaxy NGC 1275. Correlated brightening of the nucleus in both the X-ray and GeV gamma-ray energy bands was found for the period 2013–2015. This is the first evidence of correlated variability between these two energy bands for NGC 1275. We also analyzed Swift/XRT data and found that the X-ray flux increased over several days in 2010, coincidentally with the GeV gamma-ray flare. During the flare, the X-ray spectra were softer, with a photon index of ~2 compared with 1.5–2.1 of the other periods, suggesting the brightening of a synchrotron component. The GeV gamma-ray band also showed a higher flux with a harder spectrum during the 2010 flare. Simultaneous X-ray and GeV gamma-ray flux increase in the flare could be explained by the shock-in-jet scenario. On the other hand, a long-term gradual brightening of radio, X-ray, and GeV gamma-ray flux with a larger gamma-ray amplitude could have an origin other than internal shocks, and some of these possibilities are discussed.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 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 was performed in part under DOE Contract DE- AC02-76SF00515.en_US
dc.description.urihttps://iopscience.iop.org/article/10.3847/1538-4357/aaabc0en_US
dc.format.extent8 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2xmeu-ggw7
dc.identifier.citationYasushi Fukazawa et al., X-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275, The Astrophysical Journal, Volume 855, Number 2, doi: https://doi.org/10.3847%2F1538-4357%2Faaabc0en_US
dc.identifier.urihttps://doi.org/10.3847%2F1538-4357%2Faaabc0
dc.identifier.urihttp://hdl.handle.net/11603/18538
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2018ApJ...855...93F
dc.identifier.urihttps://ui.adsabs.harvard.edu/link_gateway/2018ApJ...855...93F/XMM
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2018ApJ...855...93F
dc.identifier.urihttps://heasarc.gsfc.nasa.gov/xamin/xamin.jsp?bibcode=2018ApJ%2E%2E%2E855%2E%2E%2E93F
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
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rights© 2018. The American Astronomical Society. All rights reserved.
dc.titleX-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275en_US
dc.typeTexten_US

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