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Discovery of new changing look in NGC 1566

Published online by Cambridge University Press:  29 January 2021

Victor L. Oknyansky ,
Sergey S. Tsygankov ,
Vladimir M. Lipunov ,
Evgeny S. Gorbovskoy  and
Nataly V. Tyurina
Victor L. Oknyansky
Affiliation:
M. V. Lomonosov Moscow State University, Sternberg Astronomical Institute, 119234, Moscow, Universitetsky pr-t, 13, Russian Federation e-mail: [email protected]
Sergey S. Tsygankov
Affiliation:
Department of Physics and Astronomy, FI-20014 University of Turku, Finland Space Research Institute of the Russian Academy of Sciences, Profsoyuznaya Str. 84/32, Moscow 117997, Russia
Vladimir M. Lipunov
Affiliation:
M. V. Lomonosov Moscow State University, Sternberg Astronomical Institute, 119234, Moscow, Universitetsky pr-t, 13, Russian Federation e-mail: [email protected]
Evgeny S. Gorbovskoy
Affiliation:
M. V. Lomonosov Moscow State University, Sternberg Astronomical Institute, 119234, Moscow, Universitetsky pr-t, 13, Russian Federation e-mail: [email protected]
Nataly V. Tyurina
Affiliation:
M. V. Lomonosov Moscow State University, Sternberg Astronomical Institute, 119234, Moscow, Universitetsky pr-t, 13, Russian Federation e-mail: [email protected]
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Abstract

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We present continuation of the multi-wavelength (from X-ray to optical) monitoring of the nearby changing look (CL) active galactic nucleus in the galaxy NGC 1566 performed with the Neil Gehrels Swift Observatory,the MASTER Global Robotic Network over the period 2007–2019. We also present continuation of optical spectroscopy using the South African Astronomical Observatory 1.9-m telescope between Aug. 2018 and Mar. 2019. We investigate remarkable re-brightenings in of the light curve following the decline from the bright phase observed at Dec. 2018 and at the end of May 2019. For the last optical spectra (31 Nov. 2018–28 Mar. 2019) we see dramatic changes compared to 2 Aug. 2018, accompanied by the fading of broad emission lines and high-ionization [FeX]6374Å line. Effectively, one more CL was observed for this object: changing from Sy1.2 to the low state as Sy 1.8–Sy1.9 type. Some possible explanations of the observed CL are discussed.

Keywords

AGNSpectraphotometryX-rayvariabilityNGC 1566
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 127 - 131
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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