26-30 June 2023
Centro Congressi Federico II
Europe/Rome timezone

Early-stage AGN with extreme radio variability

Not scheduled
Aula Magna (Centro Congressi Federico II)

Aula Magna

Centro Congressi Federico II

Via Partenope, 36, Napoli, Italy
Poster Poster


Dr. Emilia Järvelä (The University of Oklahoma, USA)


Narrow-line Seyfert 1 (NLS1) galaxies are a class of active galactic nuclei (AGN) identified almost 40 years ago, but still not well understood. They are preferentially hosted by disk-like galaxies, and harbour fast-growing, low-mass supermassive black holes, accreting at high Eddington ratios. Some tens of NLS1s have been detected in gamma-rays, proving the presence of powerful relativistic jets in them. An intriguing subset of jetted NLS1s was discovered in late 2010s when seven previously radio-silent sources were detected at Jy-levels at 37 GHz at Metsähovi Radio Observatory (Finland). These sources proved to exhibit extremely high-amplitude radio variability, at levels previously unseen in AGN. This launched an extensive, still ongoing, investigation into these sources, utilising several facilities - such as the JVLA, VLBA, Effelsberg, OVRO, IRAM, GranTeCan, Swift, XMM-Newton, and Fermi - across the electromagnetic spectrum. In this talk I will summarise our efforts so far to understand and explain the nature of these extraordinary AGN.

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