Study of the radio spectra evolution of Narrow-line Seyfert 1 galaxies with RATAN-600
A.G. Mikhailov*, Y. Sotnikova, T.V. Mufakharov, M. Mingaliev and T. Semenova
Pre-published on:
September 25, 2022
Published on:
December 14, 2022
Abstract
We present the radio properties of narrow-line Seyfert 1 (NLS1) galaxies, obtained using quasi-simultaneous measurements with the radio telescope RATAN-600 in the frequency range $1.2$--$22.3$ GHz. The sample of 95 NLS1s includes both galaxies emitting and not emitting $\gamma$-rays. Generally, $\gamma$-ray emitting NLS1s are more radio luminous and radio-loud than those not emitting $\gamma$-rays. The other difference is the more intensive spectral evolution for $\gamma$-ray emitters: the repetitive change of the spectral index sign on a time scale of months and a high level of variability, on average $26-37$ % at 4.7--11.2 GHz. The obtained differences between $\gamma$-ray emitting and non-emitting NLS1s can be caused by an evolving flare component in the $\gamma$-ray emitters, while for the NLS1s not emitting $\gamma$-rays a quiescent spectral component is predominant.
DOI: https://doi.org/10.22323/1.425.0029
How to cite
Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating
very compact bibliographies which can be beneficial to authors and
readers, and in "proceeding" format
which is more detailed and complete.