SDSSJ110546.07+145202.4: The first long-duration radio changing-look NLS1 galaxy
S. Komossa, D. Grupe, A. Kraus, P.G. Edwards, E.F. Kerrison, K. Rose, R. Soria, T. An, M.J. Hardcastle, K.E. Gabanyi, S. Panda, D.W. Xu, J. Wang, S. Frey, A. Mezosi

TL;DR
This paper presents multi-wavelength observations of SDSSJ110546.07+145202.4, a unique radio changing-look NLS1 galaxy with a long-duration, stable radio outburst, providing insights into radio-jet ignition and SMBH activity.
Contribution
First comprehensive multi-wavelength study of a long-duration radio changing-look NLS1 galaxy, supporting an accretion rate change as the outburst trigger.
Findings
X-ray spectrum is soft with Gamma_X=2.5.
Radio SED peaks at ~2 GHz and remains constant over >8 years.
Outburst likely caused by an accretion rate change.
Abstract
SDSSJ110546.07+145202.4 stands out as a unique radio changing-look Narrow-line Seyfert 1 (NLS1) galaxy that has brightened dramatically and shows an exceptionally long duration of its "on" phase. We present the first high-frequency radio observations, the first simultaneous radio spectral energy distributions (SEDs), the first optical--UV--X-ray SEDs, and the first X-ray monitoring and spectroscopy of this recently discovered event. Importantly for understanding the nature of the outburst, we show that the X-ray spectrum is soft with a photon index Gamma_X=2.5; line-of-sight absorption and extinction are low or absent; the radio SED is peaked at low frequencies ~2 GHz; and the radio outburst emission is very long-lived (t > 8 yr) and roughly constant. The softness of the X-ray spectrum, low supermassive black hole (SMBH) mass, and high Eddington ratio all corroborate the optical NLS1…
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