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The June 2008 flare of Markarian 421 from optical to TeV energies

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dc.contributor.author Lang, Mark en
dc.date.accessioned 2011-03-23T13:29:58Z en
dc.date.available 2011-03-23T13:29:58Z en
dc.date.issued 2008 en
dc.identifier.citation The Agile Collaboration, Gasp-Webt Collaboration, Magic Collaboration, Veritas...(2008)The June 2008 flare of Markarian 421 from optical to TeV energies, Astrophys.J.691:L13-L19,2009 en
dc.identifier.uri http://hdl.handle.net/10379/1771 en
dc.description.abstract We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very high energy ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 and June 23. A high energy $\gamma$-ray signal was detected by AGILE with \sqrt{TS}=4.5 on June 9--15, with $F(E>100 \mathrm{MeV})= 42^{+14}_{-12}\times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. This flaring state is brighter than the average flux observed by EGRET by a factor of $\sim$3, but still consistent with the highest EGRET flux. In hard X-rays (20-60 keV) SuperAGILE resolved a 5-day flare (June 9-15) peaking at $\sim$ 55 mCrab. SuperAGILE, RXTE/ASM and Swift/BAT data show a correlated flaring structure between soft and hard X-rays. Hints of the same flaring behavior are also detected in the simultaneous optical data provided by the GASP-WEBT. A Swift/XRT observation near the flaring maximum revealed the highest 2-10 keV flux ever observed from this source, of 2.6 $\times 10^{-9}$ erg cm$^{-2}$ s$^{-1}$ (i.e. > 100 mCrab). A peak synchrotron energy of $\sim$3 keV was derived, higher than typical values of $\sim$0.5-1 keV. VHE observations with MAGIC and VERITAS on June 6-8 show the flux peaking in a bright state, well correlated with the X-rays. This extraordinary set of simultaneous data, covering a twelve-decade spectral range, allowed for a deep analysis of the spectral energy distribution as well as of correlated light curves. The $\gamma$-ray flare can be interpreted within the framework of the synchrotron self-Compton model in terms of a rapid acceleration of leptons in the jet. en
dc.format application/pdf en
dc.language.iso en en
dc.subject Astrophysics en
dc.title The June 2008 flare of Markarian 421 from optical to TeV energies en
dc.type Article en
dc.local.publishedsource http://arxiv.org/pdf/0812.1500 en
dc.description.peer-reviewed peer-reviewed en
dc.local.authors The Agile Collaboration, Gasp-Webt Collaboration, Magic Collaboration, Veritas Collaboration: I. Donnarumma, et al en
dc.local.arxivid 0812.1500 en

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