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HEASA 2021

13–17 Sept 2021
Africa/Johannesburg timezone

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Session

AGN II

14 Sept 2021, 13:30

Conveners

AGN II

  • Sthabile Kolwa (University of Johannesburg)

Presentation materials

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  1. 97. Probing magnetic fields in active galactic nuclei jets
    Dr Evgeniya Kravchenko (Moscow Institute of Physics and Technology)
    14/09/2021, 13:30
    Active Galactic Nuclei
    Invited talk

    Accreting systems in the centres of Active Galactic Nuclei (AGN) produce highly collimated relativistic jets.Magnetohydrodynamic simulations show that strong magnetic fields, twisted by the differential rotation of central black hole, play dynamically important role in these processes. Due to the dependence of the polarized radiation transfer coefficients on elementary composition and energy...

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  2. 111. MeerKAT observations of radio galaxies
    Imogen Whittam (Oxford University)
    14/09/2021, 14:00
    Active Galactic Nuclei
    Invited talk

    MIGHTEE is a galaxy evolution survey currently underway with the MeerKAT radio telescope. Once complete, the survey will cover 20 square degrees in four fields to a depth of 1 uJy rms/beam at 1.28 GHz, providing a unique combination of depthand breath. Crucially, the MIGHTEE fields have excellent multi-wavelength coverage, enabling a full census of galaxy properties. I will provide an overview...

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  3. 100. RXS J08182+0122 - an AGN with an unusually broad Keplerian rotator line profile
    Hartmut Winkler (University of Johannesburg)
    14/09/2021, 14:30
    Active Galactic Nuclei
    Contributed talk

    We have investigated the Balmer line profile of the AGN linked to the X-ray source RXS J08182+0122. We present a low-resolution spectrum of this target that we obtained at SAAO and subsequently analysed. This AGN displays broad emission lines with a double bump profile that is characteristic of fast moving gas in a Keplerian orbit around a supermassive black hole. This source is particularly...

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  4. 101. Simulations of stochastic long-term variability in leptonic models for external-Compton and synchrotron self-Compton dominated blazars
    Hannes Thiersen (North-West University)
    14/09/2021, 14:45
    Active Galactic Nuclei
    Contributed talk

    In this work we investigate the nature of multi-wavelength variability of blazars from a purely numerical approach. We use a time-dependent one-zone leptonic blazar emission model to simulate multi-wavelength variability by introducing stochastic parameter variations in the emission region. These stochastic parameter variations are generated by Monte Carlo methods and have a characteristic...

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  5. 102. Simulating AGN light curves of blob injection in RMHD jet simulations
    Daniel Kulik (N/A)
    14/09/2021, 15:00
    Active Galactic Nuclei
    Contributed talk

    Active Galactic Nuclei (AGN) are compact regions in the centre of galaxies exhibiting higher than normal luminosity. Radio loud AGN produce relativistic jets which exhibit variability over various time-scales. This has been attributed to the formation of blob/shock structures propagating along the jet. Using relativistic magnetohydrodynamic (RMHD) simulations we investigate how blob injection...

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  6. 103. Jets and disc-winds from magnetically driven flows around black holes
    Indu Kalpa Dihingia (Indian Institute of Technology Indore, India)
    14/09/2021, 15:15
    Active Galactic Nuclei
    Contributed talk

    Relativistic jets and disc-winds are typically observed in BH-XRBs and AGNs. However, many physical details of jet launching and the driving of disc winds from the underlying accretion disc (AD) are still not fully understood. This study will investigate the role of different flow parameters on the launching of jets, driving disc-winds, and the dynamical properties of the disc. We will also...

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