Long-term monitoring of bright blazars in the multi-GeV to TeV range with FACT

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dc.contributor.authorTemme, Fabian
dc.contributor.authorAdam, Jan
dc.contributor.authorAhnen, Max L.
dc.contributor.authorBaack, Dominik
dc.contributor.authorBalbo, Matteo
dc.contributor.authorBergmann, Matthias
dc.contributor.authorBiland, Adrian
dc.contributor.authorBlank, Michael
dc.contributor.authorBretz, Thomas
dc.contributor.authorBrügge, Kai A.
dc.contributor.authorBuss, Jens
dc.contributor.authorDmytriiev, Anton
dc.contributor.authorDorner, Daniela
dc.contributor.authorEinecke, Sabrina
dc.contributor.authorHempfling, Christina
dc.contributor.authorHildebrand, Dorothee
dc.contributor.authorHughes, Gareth
dc.contributor.authorLinhoff, Lena
dc.contributor.authorMannheim, Karl
dc.contributor.authorMüller, Sebastian
dc.contributor.authorNeise, Dominik
dc.contributor.authorNeronov, Andrii
dc.contributor.authorNöthe, Max
dc.contributor.authorParavac, Aleksander
dc.contributor.authorPauss, Felicitas
dc.contributor.authorRhode, Wolfgang
dc.contributor.authorShukla, Amit
dc.contributor.authorThaele, Julia
dc.contributor.authorWalter, Roland
dc.date.accessioned2019-11-07T13:18:03Z
dc.date.available2019-11-07T13:18:03Z
dc.date.issued2017-02-20
dc.description.abstractBlazars 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.en
dc.identifier.urihttp://hdl.handle.net/2003/38322
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-20292
dc.language.isoende
dc.relation.ispartofseriesGalaxies;5(1)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectImaging Air Cherenkov Telescopeen
dc.subjectFirst G-APD Cherenkov Telescopeen
dc.subjectVery high energy gamma raysen
dc.subjectLong-term monitoringen
dc.subjectSilicon photo multiplieren
dc.subject.ddc530
dc.titleLong-term monitoring of bright blazars in the multi-GeV to TeV range with FACTen
dc.typeTextde
dc.type.publicationtypearticlede
dcterms.accessRightsopen access
eldorado.secondarypublicationtruede
eldorado.secondarypublication.primarycitationTemme, F.; Adam, J.; Ahnen, M.L.; Baack, D.; Balbo, M.; Bergmann, M.; Biland, A.; Blank, M.; Bretz, T.; Brügge, K.A.; Buss, J.; Dmytriiev, A.; Dorner, D.; Einecke, S.; Hempfling, C.; Hildebrand, D.; Hughes, G.; Linhoff, L.; Mannheim, K.; Müller, S.; Neise, D.; Neronov, A.; Nöthe, M.; Paravac, A.; Pauss, F.; Rhode, W.; Shukla, A.; Thaele, J.; Walter, R. Long-Term Monitoring of Bright Blazars in the Multi-GeV to TeV Range with FACT. Galaxies 2017, 5, 18.de
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.3390/galaxies5010018de

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