TELAMON: Effelsberg Monitoring of AGN Jets with Very-High-Energy Astroparticle Emissions -- Polarization properties

• Published in: arXiv.org 2023-10
• Main Authors: Heßdörfer, J, Kadler, M, Benke, P, Debbrecht, L, Eich, J, Eppel, F, Gokus, A, Hämmerich, S, Kirchner, D, Paraschos, G F, Rösch, F, Schulga, W, Sinapius, J, Weber, P, Bach, U, Berge, D, Buson, S, Dorner, D, Edwards, P G, Fromm, C M, Giroletti, M, Hervet, O, Kappes, A, Koyama, S, Kraus, A, Krichbaum, T P, Lindfors, E, Mannheim, K, Ojha, R, Pueschel, E, Ros, E, Schleicher, B, Sitarek, J, Wilms, J, Zacharias, M, Zensus, J A
• Format: Article
• Language: English
• Subjects: Active galactic nuclei; Blazars; Emission; Neutrinos; Polarization; Radio frequency; Radio spectra
• ISSN: 2331-8422

We present recent results of the TELAMON program, which is using the Effelsberg 100-m telescope to monitor the radio spectra of active galactic nuclei (AGN) under scrutiny in astroparticle physics, namely TeV blazars and neutrino-associated AGN. Our sample includes all known Northern TeV-emitting blazars as well as blazars positionally coincident with IceCube neutrino alerts. Polarization can give additional insight into the source properties, as the polarized emission is often found to vary on different timescales and amplitudes than the total intensity emission. Here, we present an overview of the polarization properties of the TeV-emitting TELAMON sources at four frequencies in the 20 mm and 7 mm bands. While at 7 mm roughly \(82\,\%\) of all observed sources are found to be significantly polarized, for 20 mm the percentage is \(\sim58\,\%\). We find that most of the sources exhibit mean fractional polarizations of \(