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http://hdl.handle.net/20.500.12386/34528
Title: | The GeV-band variability of Mrk 421 | Authors: | Kapanadze, B. Dorner, D. VERCELLONE, STEFANO ROMANO, Patrizia Kapanadze, S. Tabagari, L. |
Issue Date: | 2017 | Journal: | AIP CONFERENCE PROCEEDINGS | Volume: | HIGH ENERGY GAMMA-RAY ASTRONOMY: 6th International Symposium on High Energy Gamma-Ray Astronomy | Number: | 1792 | Issue: | 1 | First Page: | 050021 | Abstract: | The TV-detected blazar Markarian 421 is the brightest high-energy peaked BL Lac (HBL) source in the GeV energy range, detectable with 3 sigma significance on daily timescales in medium and higher brightness states with Large Area Telescope onboard Fermi. The 0.3-300 GeV flux showed a strong variability on diverse time scales from the flares lasting a few weeks down to intraday flux fluctuations detected mostly in the flaring states. The source also exhibited a GeV spectral variability. We mostly observe a low spectral curvature in this band due to the presence of the Inverse Compton peak at the energies mainly beyond about 100 GeV. The GeV flux generally showed a significantly stronger correlation with the radio-UV fluxes than with those in the X-ray and TeV bands that confirms the hypothesis about the possible stronger connection between radio-UV and GeV emissions due the effect of Klein-Nishina suppression on the IC process, leading to the effective up-scattering of radio-UV photons at the GeV energies by the X-ray emitting electrons. <P /> | Conference Name: | 6th International Symposium on High Energy Gamma-Ray Astronomy | Conference Place: | Heidelberg | Conference Date: | July 11-15, 2016 | URI: | http://hdl.handle.net/20.500.12386/34528 | URL: | https://www.mpi-hd.mpg.de/hd2016/pages/news.php | ISSN: | 0094-243X | DOI: | 10.1063/1.4968967 | Bibcode ADS: | 2017AIPC.1792e0021K | Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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1.4968967.pdf | PDF editoriale | 1.02 MB | Adobe PDF | View/Open |
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