Description
Chair: Sera Markoff
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Dr Anna Luashvili (North-West University, Centre for Space Research)30/09/2026, 13:00Active Galactic NucleiInvited Talk
Since 2019, the Event Horizon Telescope (EHT) Collaboration released the first horizon-scale images of M87 and Sgr A, two primary EHT targets and the only systems resolved at horizon scales so far, while the innermost jet regions of a few (other) AGNi were explored at an unprecedented angular resolution. EHT campaigns are accompanied by extensive MWL observations, from radio up to...
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Suvas Chaudhary (University of the Free State, Bloemfontein, South Africa.)30/09/2026, 13:31Active Galactic NucleiContributed Talk
Blazars are promising sources of extragalactic high-energy astrophysical neutrinos, detected at energies $\gtrsim 10$ TeV by the IceCube neutrino observatory. Here, we report the broadband timing and spectral study of the flat-spectrum radio quasar PKS 1725+123, which has recently emerged as a compelling multimessenger target following its spatial association with the IceCube event IC-201021A....
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Mfuphi Ntshatsha30/09/2026, 13:44Active Galactic NucleiContributed Talk
Blazars are a subclass of active galactic nuclei spatially oriented such that our line of sight is closely aligned with their jets. This configuration results in the emissions by relativistic electrons in the jet being Doppler enhanced to higher observed frequencies and luminosities. By contrast, the jets of their parent population, the radio galaxies, point at large angles relative to our...
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Motseothata Tisang30/09/2026, 13:57Active Galactic NucleiContributed Talk
Blazars exhibit a characteristic double-humped, non-thermal spectral energy distribution and polarized emission from radio through X-ray energies. While spectral modeling constrains the physical conditions within the emitting region, it does not uniquely constrain the underlying magnetic-field geometry. Polarization provides an additional diagnostic that is sensitive to the projected...
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Mikhail de Villiers (University of Cape Town / South African Astronomical Observatory)30/09/2026, 14:10Active Galactic NucleiContributed Talk
Majority of galaxies live in the group environment, which serve as an intermediate galaxy environment between the field and the cluster, making the investigation of the processes involved vital for understanding galaxy evolution. We present MeerKAT observations of the Grus quartet as part of the MeerChoirs survey. The Grus quartet consists of four large spiral galaxies, NGC 7552, NGC 7582, NGC...
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Laenita Lorraine Oberholzer30/09/2026, 14:23Active Galactic NucleiContributed Talk
Orphan flares are events where flaring takes place in one frequency
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unaccompanied by flaring in other bands. Orphan flares are usually secondary flares. We study a very-high-energy orphan flare taking place in 3C279, an FSRQ-type blazar. A primary flare was observed 11 days earlier by Fermi-LAT. We study three models that could explain orphan flares. The hadronic synchrotron mirror model,...