TELAMON: Effelsberg monitoring of AGN jets with very-high-energy astroparticle emission — I. Program description and sample characterization. (arXiv:2401.06296v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Eppel_F/0/1/0/all/0/1">F. Eppel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kadler_M/0/1/0/all/0/1">M. Kadler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hessdorfer_J/0/1/0/all/0/1">J. Heßdörfer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Benke_P/0/1/0/all/0/1">P. Benke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Debbrecht_L/0/1/0/all/0/1">L. Debbrecht</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Eich_J/0/1/0/all/0/1">J. Eich</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gokus_A/0/1/0/all/0/1">A. Gokus</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hammerich_S/0/1/0/all/0/1">S. Hämmerich</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kirchner_D/0/1/0/all/0/1">D. Kirchner</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Paraschos_G/0/1/0/all/0/1">G. F. Paraschos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rosch_F/0/1/0/all/0/1">F. Rösch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schulga_W/0/1/0/all/0/1">W. Schulga</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sinapius_J/0/1/0/all/0/1">J. Sinapius</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Weber_P/0/1/0/all/0/1">P. Weber</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bach_U/0/1/0/all/0/1">U. Bach</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dorner_D/0/1/0/all/0/1">D. Dorner</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Edwards_P/0/1/0/all/0/1">P. G. Edwards</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Giroletti_M/0/1/0/all/0/1">M. Giroletti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kraus_A/0/1/0/all/0/1">A. Kraus</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hervet_O/0/1/0/all/0/1">O. Hervet</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Koyama_S/0/1/0/all/0/1">S. Koyama</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Krichbaum_T/0/1/0/all/0/1">T. P. Krichbaum</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mannheim_K/0/1/0/all/0/1">K. Mannheim</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ros_E/0/1/0/all/0/1">E. Ros</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zacharias_M/0/1/0/all/0/1">M. Zacharias</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zensus_J/0/1/0/all/0/1">J. A. Zensus</a>
Aims. 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.
Methods. We analyze the data sample from the first ~2.5 years of observations
between August 2020 and February 2023 in the range from 14 GHz to 45 GHz.
During this pilot phase, we have observed all 59 TeV-detected blazars in the
Northern Hemisphere (i.e., Dec. >0{deg}) 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.
Results. 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 find a
median spectral index ($S(nu)proptonu^alpha$) of $alpha=-0.11$. 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.
Aims. 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.
Methods. We analyze the data sample from the first ~2.5 years of observations
between August 2020 and February 2023 in the range from 14 GHz to 45 GHz.
During this pilot phase, we have observed all 59 TeV-detected blazars in the
Northern Hemisphere (i.e., Dec. >0{deg}) 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.
Results. 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 find a
median spectral index ($S(nu)proptonu^alpha$) of $alpha=-0.11$. 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.
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