7-9 December 2016
Cochem (Mosel), Germany
Europe/Berlin timezone
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Studies on the VHE γ-ray/X-ray correlation in high-synchrotron peak BL Lacs

7 Dec 2016, 12:15
Pater Martin Hall (Kapuzinerkloster)

Pater Martin Hall


Oral HAP Workshop Multi-Wavelength Astronomy


Dr. Maria Magdalena Gonzalez (Universidad Nacional Autonoma de Mexico)


Many multi-wavelength campaigns have been carried out to study high-synchrotron peak BL Lacs (HBL). In particular the activity in the gamma-rays and X-rays seems to be correlated in many observations but, not conclusive results have been achieved yet. In this work we present a robust and comprehensive study of the (VHE) γ-ray/X- ray correlation of Mrk 421 with data taken with different VHE experiments on different time scales and different levels of activity of the source. We show that, independently of the time scale, there exists a robust correlation, consistent between instruments and that can be described as a linear function. However, a breakdown of the correlation is clearly evident at high states of activity with fluxes comparable with three times the one of the Crab at energies above 400 GeV independently of the time scale, observational period or instrument. The breakdown is observed as an arbitrary decrement in the X-ray flux while the source remains in a high state of activity in VHE γ-rays. Even for single flares, the X-ray and VHE γ-ray emissions lie on the correlation until the VHE γ-ray flux reaches values higher than the mentioned above. We present a theoretical interpretation of these results within the leptonic SSC scenario and extend our studies to other HBL.

Primary author

Dr. Maria Magdalena Gonzalez (Universidad Nacional Autonoma de Mexico)


Dr. Barbara Patricelli (Dipartimento de fisica, Universita di Pisa) Dr. Jose Andres Garcia (Instituto de Fisica, UNAM) Dr. Nissim Fraija (Instituto de Astronomia, UNAM) Dr. Simone Dichiara (Instituto de Astronomia, UNAM)

Presentation Materials

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