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TELAMON: Effelsberg monitoring of AGN jets with very-high-energy astroparticle emission - I. Program description and sample characterization

We introduce 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, specifically TeV blazars and candidate neutrino-associated AGN. Here, we present and characterize our main sample of T...

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Main Authors: Eppel, Florian (Author) , Kadler, Matthias (Author) , Heßdörfer, J. (Author) , Benke, P. (Author) , Debbrecht, L. (Author) , Eich, J. (Author) , Gokus, Andrea Katharina (Author) , Hämmerich, S. (Author) , Kirchner, D. (Author) , Paraschos, G. F. (Author) , Rösch, F. (Author) , Schulga, W. (Author) , Sinapius, J. (Author) , Weber, P. (Author) , Bach, U. (Author) , Dorner, D. (Author) , Edwards, P. G. (Author) , Giroletti, M. (Author) , Kraus, A. (Author) , Hervet, O. (Author) , Koyama, S. (Author) , Krichbaum, T. P. (Author) , Mannheim, K. (Author) , Ros, E. (Author) , Zacharias, Michael (Author) , Zensus, J. Anton (Author)
Format: Article (Journal)
Language:English
Published: April 2024
In: Astronomy and astrophysics
Year: 2024, Volume: 684, Pages: 1-16
ISSN:1432-0746
DOI:10.1051/0004-6361/202348262
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202348262
Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2024/04/aa48262-23/aa48262-23.html
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Author Notes:F. Eppel, M. Kadler, J. Heßdörfer, P. Benke, L. Debbrecht, J. Eich, A. Gokus, S. Hämmerich, D. Kirchner, G.F. Paraschos, F. Rösch, W. Schulga, J. Sinapius, P. Weber, U. Bach, D. Dorner, P.G. Edwards, M. Giroletti, A. Kraus, O. Hervet, S. Koyama, T.P. Krichbaum, K. Mannheim, E. Ros, M. Zacharias, and J.A. Zensus
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Summary:We introduce 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, specifically TeV blazars and candidate neutrino-associated AGN. Here, we present and characterize our main sample of TeV-detected blazars.We analyzed the data sample from the first ∼2.5 yr of observations between August 2020 and February 2023 in the range from 14 GHz to 45 GHz. During this pilot phase, we observed all 59 TeV-detected blazars in the Northern Hemisphere (i.e., Dec > 0°) known at the time of observation. We discuss the basic data reduction and calibration procedures used for all TELAMON data and introduce a sub-band averaging method used to calculate average light curves for the sources in our sample.The TeV-selected sources in our sample exhibit a median flux density of 0.12 Jy at 20 mm, 0.20 Jy at 14 mm, and 0.60 Jy at 7 mm. The spectrum for most of the sources is consistent with a flat radio spectrum and we found a median spectral index (<i>S<i/>(<i>ν<i/>)∝<i>ν<i/><sup><i>α<i/><sup/>) of <i>α<i/> = −0.11. Our results on flux density and spectral index are consistent with previous studies of TeV-selected blazars. Compared to the GeV-selected F-GAMMA sample, TELAMON sources are significantly fainter in the radio band. This is consistent with the double-humped spectrum of blazars being shifted towards higher frequencies for TeV-emitters (in particular for high-synchrotron peaked BL Lac type objects), which results in a lower radio flux density. The spectral index distribution of our TeV-selected blazar sample is not significantly different from the GeV-selected F-GAMMA sample. Moreover, we present a strategy to track the light curve evolution of sources in our sample for future variability and correlation analysis.
Item Description:Online veröffentlicht am 28. März 2024
Gesehen am 24.09.2024
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202348262

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