Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-10-12
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
for the VERITAS and Fermi-LAT Collaborations and other groups involved in the 2009 Mrk 501 MWL Campaign. To appear in the proc
Scientific paper
We present observations of the gamma-ray blazar Markarian 501 between April 17 and May 5, 2009, with the Whipple 10-m telescope, VERITAS, the Fermi Large Area Telescope (LAT), Swift and RXTE as part of a 4.5-month multi-wavelength campaign. The presentation will focus on the strong very high energy (VHE) gamma-ray activity detected on May 1st with Whipple and VERITAS, when the measured flux (E > 400 GeV) reached five times the flux of the Crab Nebula, coincident with an increase in the optical polarization by a factor of 5, and a rotation of the polarization angle by 15 degrees. We also show that, during this 3-week period, the largest flux and spectral variability is seen at the highest energies of the broadband spectral energy distribution.
for the Fermi-LAT Collaboration
for the VERITAS Collaboration
Paneque David
Pichel Ana
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