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Tenth International Fermi Symposium

9–15 Oct 2022
Africa/Johannesburg timezone

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Session

Parallel 3

11 Oct 2022, 14:00

Conveners

Parallel 3: AGN I

  • Hartmut Winkler (University of Johannesburg)

Presentation materials

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  1. 97. Recent VERITAS Blazar Highlights
    Megan Splettstoesser
    11/10/2022, 14:00
    Contributed Talk

    VERITAS (the Very Energetic Radiation Imaging Telescope Array System) is an array of four 12-meter imaging atmospheric Cherenkov telescopes located at Fred Lawrence Whipple Observatory in Arizona. VERITAS is sensitive to gamma rays with energies between 85 GeV to 30 TeV. First light for the four telescope array was in 2007, shortly before the launch of Fermi. VERITAS has a large extragalactic...

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  2. 86. Studying the multi-wavelength properties of gamma-ray flaring blazars at redshift > 3
    Andrea Gokus (Dr. Karl Remeis-Observatory/ECAP)
    11/10/2022, 14:15
    Contributed Talk

    High-redshift (z > 3) gamma-ray blazars offer the possibility to study black hole growth, accretion processes and jet acceleration in the early Universe. The most luminous blazars, detectable out to high redshifts, tend to have the peaks in their non-thermal spectral energy distributions (SEDs) at relatively low frequencies, with the high-energy peak often appearing at MeV energies. In...

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  3. 145. Southern African Large Telescope Spectroscopy of Fermi-LAT Blazars
    Eli Kasai (University of Namibia)
    11/10/2022, 14:30
    Contributed Talk

    More than 250 galactic and extragalactic very-high energy gamma-ray sources have been detected to date with imaging atmospheric Cherenkov telescopes. At present, Active Galactic Nuclei (AGNs) make up about 35% of such sources, the majority of which are blazars, i.e. their jets are closely aligned with the line of sight to Earth. At lower energies, blazars also dominate the population of...

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  4. 131. The variety of extreme blazars in the AstroSat view
    Pranjupriya Goswami (North-West University)
    11/10/2022, 14:45
    Contributed Talk

    We present a spectral study of extreme blazars (also eHBL) which are
    known to exhibit hard intrinsic X-ray/TeV spectra and extreme SED peak
    energies. We study four eHBLs 1ES 0120+340, RGB J0710+591, 1ES 1101-
    232, 1ES 1741+196 and one HBL 1ES 2322-409 using new X-ray data from
    AstroSat, together with quasi-simultaneous Fermi-LAT and other archival
    multi-frequency data. Three of the eHBLs...

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  5. 103. Modeling the Multi-wavelength Polarization and Spectral Energy Distributions of Blazars
    Hester Schutte
    11/10/2022, 15:00
    Contributed Talk

    In the radio through optical-UV/X-ray regime, blazars emit highly polarized (nonthermal) synchrotron emission. Emission from the dusty torus, broad line region, accretion disk and host galaxy is of thermal origin and unpolarized. In some cases, their contribution is visible in spectropolarimetry wherein the unpolarized thermal emission dilutes the synchrotron polarization. However, partially...

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  6. 58. Effects of non-continuous losses during inverse Compton cooling in blazars
    Anton Dmytriiev (North-West University)
    11/10/2022, 15:15
    Contributed Talk

    Blazar flares are ideally suited to study the extreme physics of relativistic outflows, with the primary method for this objective being physical modeling of the varying broad-band emission from blazar jets. Many of the numerical codes developed for this task, are based on the kinetic approach tracking the particle spectrum evolution due to various physical processes (acceleration, cooling,...

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