Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914907m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #149.07
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on observations of the high-synchrotron-peaked BL Lac (HBL) Markarian 421 during a bright X-ray flaring period in February 2010. Combining data in the GeV band, obtained by the Fermi Large Area Telescope, with data in the X-rays, obtained by the RXTE, Swift, and MAXI observatories, we find evidence for correlated variability between the X-ray and GeV emission for the first time in an HBL. Including data from the UVOT instrument aboard Swift, we model the spectral energy distribution of the source in the pre-flare, flare and post-flare time periods using the standard synchrotron self-Compton model. In the context of these models, the GeV and X-ray emission arise from electrons with significantly different energies in the particle distributions that are inferred from the models. We discuss the constraints that the correlated X-ray/GeV temporal behavior places on the properties of the emitting plasma during this flare.
Chiang James
Fegan Stephen
Fermi LAT Collaboration
Giebels Berrie
Horan Deirdre
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