HEASA 2024

Session

AGN IV

4 Oct 2024, 13:30

Conveners

AGN IV

• Sthabile Kolwa (university of johannesburg)

20. Study of the hadronic synchrotron mirror model for orphan flares in blazars - Application to 3C279

Laenita Lorraine Oberholzer

04/10/2024, 13:30

Active Galactic Nuclei

Contributed Talk

Blazars are a class of Active Galactic Nuclei (AGN), found in the centres of elliptical galaxies, that are radio loud and have a small angle between the jet and the observer’s line of sight. In some cases, flaring events in one frequency band are not accompanied by flaring in other bands. Such events are called orphan flares. The causes of this variability and conditions in and location of the...

14. H.E.S.S. detection and multiwavelength study of the z ∼ 1 blazar PKS 0346-27

Ogochukwu Chibueze (NORTH WEST UNIVERSITY, POTCHEFSTROOM, SOUTH AFRICA)

04/10/2024, 13:45

Active Galactic Nuclei

Contributed Talk

**We report the detection of a TeV blazar PKS 0346-27 at redshift 0.99 by the High Energy Stereoscopic System (H.E.S.S.) on 3rd November, 2021 with a significance above 5 σ. The spectral energy distribution (SED) consists of the simultaneous observations by Fermi-LAT, Swift XRT and UVOT during the H.E.S.S detection period. We show that a hadronic one-zone model (modified by strong EBL...

1. H.E.S.S. observations of composite Seyfert–starburst galaxies

Andrew Chen

04/10/2024, 14:00

Active Galactic Nuclei

Contributed Talk

Composite galaxies, containing both a starburst and Seyfert component, may produce very-high-energy (VHE; > 100 GeV) γ-ray emission at vastly different spatial scales ranging from several Schwarzschild radii of a supermassive black hole (SMBH) to a dozen kiloparsecs. In addition to core-collapse supernova remnants, various sources have been suggested to explain multiwavelength and/or...