Study of the radio spectra evolution of Narrow-line Seyfert 1 galaxies with RATAN-600
September 25, 2022
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.
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