FERMI view of the TeV blazar Markarian 421

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The high energy component of the TeV blazar Markarian 421 has been extensively studied since the beginning of the 90s, when the source was first detected at gamma-rays with EGRET and the Whipple Telescope, yet the source is still far from being understood. The high sensitivity, large dynamic range, and excellent time coverage of the Fermi Large Area Telescope (LAT), all representing significant advances over previous gamma-ray observations, will play a key role in the elucidation of the physical processes underlying the high energy emission of this blazar. In this presentation we show the results from almost 6 months (4 ... continued below

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4 pages

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Paneque, D; /SLAC /KIPAC, Menlo Park; Raino, S.; /Bari Polytechnic /INFN, Bari; Chiang, J.; /SLAC /KIPAC, Menlo Park et al. August 26, 2010.

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The high energy component of the TeV blazar Markarian 421 has been extensively studied since the beginning of the 90s, when the source was first detected at gamma-rays with EGRET and the Whipple Telescope, yet the source is still far from being understood. The high sensitivity, large dynamic range, and excellent time coverage of the Fermi Large Area Telescope (LAT), all representing significant advances over previous gamma-ray observations, will play a key role in the elucidation of the physical processes underlying the high energy emission of this blazar. In this presentation we show the results from almost 6 months (4 August 2008 to 20 January 2009) of observation with LAT. We report significant flux/spectral variability on a range of time scales from weeks to days, and an energy spectrum from 0.1 GeV to 300 GeV, overlapping with the energy ranges covered by the current generation of Cherenkov Telescopes. Results on the observations of the BLLac object Markarian 421 collected in the first months of operation of the Fermi satellite have been presented. Light curves on weekly and daily timescales have been shown, as well as the results of the spectral analysis in the energy range between 100 MeV and 300 GeV, covered for the first time by a satellite experiment overlapping the lower energy observations from Cherenkov telescopes on earth. These results are still preliminary and will be enriched and completed soon by a forthcoming publication. The results shown here demonstrate the great performance of Fermi-LAT to study the gamma-emission from Mrk421 (and blazars in general) over a large dynamic range and also on short timescales, which is expected to be of key importance for the study of the emission of the source in a coordinated way with other instruments covering other energy ranges.

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4 pages

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  • Journal Name: Submitted to Astrophysical Journal; Conference: Presented at the 31st International Cosmic Ray Conference, 7-15 Jul 2009, Lodz, Poland

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  • Report No.: SLAC-PUB-13643
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 992461
  • Archival Resource Key: ark:/67531/metadc1012400

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  • August 26, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 2, 2017, 8:12 p.m.

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Paneque, D; /SLAC /KIPAC, Menlo Park; Raino, S.; /Bari Polytechnic /INFN, Bari; Chiang, J.; /SLAC /KIPAC, Menlo Park et al. FERMI view of the TeV blazar Markarian 421, article, August 26, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1012400/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.