13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

Broadband characterisation and physical implications from the most extreme X-ray flaring activity of the high-peaked BL Lac Mrk 501

15 Dec 2015, 14:21
Level 0, Room 4 (International Conference Centre Geneva)

Level 0, Room 4

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


Josefa Becerra Gonzalez (NASA GSFC)


The high-frequency-peaked BL Lac object Markarian 501 is a very high energy (VHE, E>100 GeV) emitter located in our extragalactic neighborhood (z=0.034). The source can be detected in the VHE band during low state, what makes this target an ideal source for long-term multi-wavelength studies covering the entire electromagnetic spectrum. During a multi-wavelength campaign in 2014, the source showed the highest X-ray activity observed by Swift-XRT during the last decade. The source displayed very hard spectra at X-rays and gamma-ray energies with variability on day timescales. The distortion of the broadband SED strongly suggests the existence of, at the very least, an extra component with ultra-energetic and relatively narrow electron energy distribution, which had never been seen before for Mrk501. In the conference I will report about this unprecedented flaring event and its physical implications.
Collaboration on behalf of the MAGIC and Fermi-LAT collaboration

Primary author


David Paneque Camarero (Instituto de Fisica de Altas Energias (IFAE)) Fabrizio Tavecchio (INAF) Kazuma Ishio (MPI) Koji Noda (Max-Planck-Institute for Physics) Matteo Perri (ASI Science Data Center)

Presentation Materials