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A new kind of changing-look AGN?

3 Apr 2021, 19:31 UTC
A new kind of changing-look AGN?
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Title: The 450 days X-ray monitoring of the changing-look AGN 1ES 1927+654Authors: C. Ricci, M. Loewenstein, E. Kara, R. Remillard, B. Trakhtenbrot, I. Arcavi, K. C. Gendreau, Z. Arzoumanian, A. C. Fabian, R. Li, L. C. Ho, C. L. MacLeod, E. Cackett, D. Altamirano, P. Gandhi, P. Kosec, D. Pasham, J. Steiner, C.-H. ChanFirst Author’s Institution: Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, ChileStatus: Accepted to ApJS.Accreting supermassive black holes at the centers of galaxies are some of the most powerful objects in the Universe, outshining even their host galaxies. These active galactic nuclei (AGN) exhibit strong variability in their luminosity and emission lines. Some AGN show very broad emission lines in their spectra coming from high velocity gas orbiting near the black hole, while others only show narrow emission lines. AGN are typically classified based on the existence of these emission lines as Type-1 (broad emission) or Type-2 (no broad emission). Why some AGN don’t show broad lines in their spectra is still up for debate—some AGN, known as changing-look AGN, have been observed to actually switch types!The subject of today’s paper is a nearby AGN called 1ES 1927+654, originally ...

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