Authors: Temme, Fabian
Adam, Jan
Ahnen, Max L.
Baack, Dominik
Balbo, Matteo
Bergmann, Matthias
Biland, Adrian
Blank, Michael
Bretz, Thomas
Brügge, Kai A.
Buss, Jens
Dmytriiev, Anton
Dorner, Daniela
Einecke, Sabrina
Hempfling, Christina
Hildebrand, Dorothee
Hughes, Gareth
Linhoff, Lena
Mannheim, Karl
Müller, Sebastian
Neise, Dominik
Neronov, Andrii
Nöthe, Max
Paravac, Aleksander
Pauss, Felicitas
Rhode, Wolfgang
Shukla, Amit
Thaele, Julia
Walter, Roland
Title: Long-term monitoring of bright blazars in the multi-GeV to TeV range with FACT
Language (ISO): en
Abstract: Blazars like Markarian 421 or Markarian 501 are active galactic nuclei (AGN), with their jets orientated towards the observer. They are among the brightest objects in the very high energy (VHE) gamma ray regime (>100 GeV). Their emitted gamma-ray fluxes are extremely variable, with changing activity levels on timescales between minutes, months, and even years. Several questions are part of the current research, such as the question of the emission regions or the engine of the AGN and the particle acceleration. A dedicated longterm monitoring program is necessary to investigate the properties of blazars in detail. A densely sampled and unbiased light curve allows for observation of both high and low states of the sources, and the combination with multi-wavelength observation could contribute to the answer of several questions mentioned above. FACT (First G-APD Cherenkov Telescope) is the first operational telescope using silicon photomultiplier (SiPM, also known as Geigermode—Avalanche Photo Diode, G-APD) as photon detectors. SiPM have a very homogenous and stable longterm performance, and allow operation even during full moon without any filter, leading to a maximal duty cycle for an Imaging Air Cherenkov Telescope (IACT). Hence, FACT is an ideal device for such a longterm monitoring of bright blazars. A small set of sources (e.g., Markarian 421, Markarian 501, 1ES 1959+650, and 1ES 2344+51.4) is currently being monitored. In this contribution, the FACT telescope and the concept of longterm monitoring of bright blazars will be introduced. The results of the monitoring program will be shown, and the advantages of densely sampled and unbiased light curves will be discussed.
Subject Headings: Imaging Air Cherenkov Telescope
First G-APD Cherenkov Telescope
Very high energy gamma rays
Long-term monitoring
Silicon photo multiplier
Issue Date: 2017-02-20
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Appears in Collections:Experimentelle Physik V

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