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http://hdl.handle.net/20.500.12386/27559
Titolo: | X-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275 | Autori: | Fukazawa, Yasushi Shiki, Kensei Tanaka, Yasuyuki Itoh, Ryosuke Takahashi, Hiromitsu Imazato, Fumiya D'AMMANDO, FILIPPO Ojha, Roopesh Nagai, Hiroshi |
Data pubblicazione: | 2018 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 855 | Fascicolo: | 2 | Da pagina:: | 93 | Abstract: | We 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. | URI: | http://hdl.handle.net/20.500.12386/27559 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/aaabc0 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aaabc0 | Bibcode ADS: | 2018ApJ...855...93F | Fulltext: | open |
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