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T: Fachverband Teilchenphysik

T 14: Gammaastronomie 1

T 14.8: Vortrag

Montag, 27. März 2017, 18:35–18:50, H 2

FACT - Time-Resolved Spectral Energy Distributions from Blazar Flares — •Daniela Dorner¹ and Thomas Bretz² for the FACT-Collaboration and the MWL-group collaboration — ¹Universität Würzburg, Germany — ²RWTH Aachen, Germany

The First G-APD Cherenkov Telescope (FACT) is monitoring blazars at TeV energies. Based on the results of a fast quick look analysis, alerts are sent to the astronomy community with low latency. This allows to set up target-of-opportunity programs, as it has been done with the X-ray satellites Swift, INTEGRAL and XMM-Newton.

While FACT provides the monitoring at TeV energies on a nightly basis, Swift monitors weekly at X-rays to check for time-lags or correlations. In case FACT measures a flux above 70 events/hour, more sensitive observations with INTEGRAL or XMM-Newton are triggered to study the evolution of the spectrum during and after the flare.

Based on this program, time-resolved spectral energy distributions are compiled and used to discern radiation mechanisms such as synchrotron-self-Compton emission (X-ray flux and gamma-ray flux strictly correlated) from photo-hadronic cascade emission, allowing more complex variability patterns.

Here, we present preliminary results of simultaneous and time-resolved broadband observations of Mrk 421 during a moderate-high flux state in December 2015, which were triggered by FACT and include simultaneous observations with the X-ray telescopes Swift and INTEGRAL.