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Nordic-Baltic Astronomy Days 2026

26–29 May 2026
Radisson Blu Marina Palace Hotel
Europe/Helsinki timezone

Session

28-B1: AGN

Th-06B
28 May 2026, 13:15
Room B

Room B

Description

Chair: Talvikki Hovatta

Presentation materials

There are no materials yet.

  1. 317. The Astroparticle Physics European Consortium (APPEC) and the Astrophysics Centre for Multi-messenger studies in Europe (ACME)
    Antoine Kouchner (Centre National de la Recherche Scientifique (FR))
    28/05/2026, 13:15
    Oral

    The Astroparticle Physics European Consortium (APPEC) is an international organisation bringing together the European scientific community active in astroparticle physics. Its mission is to promote and coordinate research in this field by fostering transnational collaboration, developing common strategies, and supporting the construction and operation of large-scale research infrastructures....

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  2. 318. Are AGN jets emitting high-energy neutrinos?
    Pouya Kouch (University of Turku)
    28/05/2026, 13:30
    Oral

    Since two decades ago the IceCube Neutrino Observatory has been detecting ~TeV-PeV neutrinos from mostly unidentified extraterrestrial sources. So far, active galactic nuclei (AGN), powered by supermassive black holes (SMBH), are theoretically and observationally the most likely source candidates. The hottest spot in the diffuse ~TeV neutrino sky is a weakly jetted Seyfert-II AGN, while the...

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  3. 319. Long-term optical variability of blazars
    Folkert Wierda (Turku University)
    28/05/2026, 13:45
    Oral

    Blazars, a subclass of active galactic nuclei with relativistic jets aligned close to the line of sight, exhibit strong, rapidly variable emission across the electromagnetic spectrum due to Doppler boosting. Their double-peaked spectral energy distributions (SEDs) are attributed to synchrotron emission at lower frequencies and inverse Compton scattering at higher frequencies, providing key...

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  4. 320. On the hunt for peaked source-like narrow-line Seyfert 1 galaxies
    Irene Varglund
    28/05/2026, 14:00
    Oral

    From sources with presumably no significant radio emission to sources capable of forming and maintaining relativistic jets, narrow-line Seyfert 1 galaxies (NLS1s) have challenged paradigms. These sources are identified by their distinct spectral line features: the full width at half maximum being a maximum of 2000 km/s for the broad Hb component and S[O III]/S(Hb) < 3. However, due to the...

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  5. 321. Understanding the structure and variability of AGN
    Scott Hagen (IFPU / SISSA / INAF-OATs)
    28/05/2026, 14:15
    Oral

    Active galactic nuclei (AGN) are powered by accretion onto a supermassive black hole (SMBH), but the structure of this flow is not well understood. Standard accretion disc models match to zeroth order in predicting substantial energy dissipated in optically-thick material, producing a strong blue/UV continuum. More detailed comparisons to the observed spectral shapes fail, along with a...

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