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Dr Daniela Huppenkothen (New York University)12/8/16, 9:00 AMHAP WorkshopOralVirtually all astronomical sources are variable on some time scale, making studies of variability across different wavelengths a major tool in pinning down the underlying physical processes, for example accretion onto compact objects and cataclysmic explosions like gamma-ray bursts. The new telescopes currently starting operations or coming online in the coming years, including the Square...Go to contribution page
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Mr Ioannis Liodakis (University of Crete, FORTH)12/8/16, 9:30 AMHAP WorkshopOralBlazars are known to show periods of quiescence followed by extreme outbursts seen throughout the electromagnetic spectrum. We present a novel maximum likelihood approach to capturing this bimodal behavior by examining blazar radio variability in the flux-density domain. We separate quiescent and flaring components of a source's light curve by modeling its flux-density distribution as a series...Go to contribution page
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Dr Guillaume Belanger (European Space Agency)12/8/16, 9:50 AMHAP WorkshopOralTime domain astronomy and astrophysics are concerned with studying the temporal characteristics of the light from distant astrophysical sources that our instruments detect. Consequently, time domain studies are aimed at the detection and characterisation of variability: periodic variability, aperiodic or stochastic variability, and transient events. In this presentation, I propose to introduce...Go to contribution page
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Dr Arti Goyal (Astronomical observatory of the Jagiellonian University)12/8/16, 10:10 AMHAP WorkshopOralThe typical shape of blazar lightcurves' power spectra is a power-law, $P(f) = A f^{-\beta}$, where A is the normalization and $\beta$ is the slope, indicating that the variability is generated by the underlying $\it stochastic$ processes which is of colored noise type (i.e., $\beta \simeq 1-3$). Here we present the results of power spectral analysis of 5 blazars utilizing the $\it Fermi$-LAT...Go to contribution page
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Dr Ian McHardy12/8/16, 11:15 AMOralMost of our understanding of the processes that power AGN has been gained not from single-epoch observations, but from monitoring over long periods and, usually, in more than waveband. In this talk I will describe the results of combined X-ray/UV/optical monitoring of Seyfert galaxies which have shown that UV/optical variability on short timescales is largely driven by reprocessing of high...Go to contribution page
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Walter Max-Moerbeck (Max-Planck-Institut für Radioastronomie)12/8/16, 11:45 AMHAP WorkshopOralI will discuss our efforts to determine the location of the gamma-ray emission site in blazars with the ongoing OVRO 40 meter telescope blazar monitoring program. This program started in 2008 and is currently monitoring about 1800 blazars at 15 GHz with twice a week cadence for a sample including most of the bright blazars north of declination -20 degrees. A summary of previous findings and...Go to contribution page
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Dr Nachiketa Chakraborty (Max Planck Institute for Nuclear Physics)12/8/16, 12:05 PMHAP WorkshopOralDespite intensive research over a few decades facilitated by highly sensitive multiwavelength (MWL) telescopes, fundamental characteristics of active galactic nuclei (AGNs) are still open. With respect to physics of individual AGNs, the location and mechanisms of particle acceleration, their connection to flaring, relative importance of hadronic and leptonic processes in specific sources and...Go to contribution page
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Dr Tim Ruhe (TU Dortmund)12/8/16, 12:25 PMHAP WorkshopOralObtaining energy spectra of incident particles such as neutrinos or gamma-rays is a common challenge in neutrino- and Air-Cherenkov astronomy, as the particle's energy cannot be observed directly but has to be inferred from other observables e.g. energy losses of secondary particles utilized for detection. The task is further made difficult by the fact that the production of secondaries, e.g....Go to contribution page
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