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Optical variations in changing-look AGNs selected at X-rays

Published online by Cambridge University Press:  29 January 2021

Sara Cazzoli ,
Josefa Masegosa ,
Isabel Márquez ,
Lorena Hernández-García ,
A. Álvarez-Hernández  and
Laura Hermosa-Muñoz
Sara Cazzoli
Affiliation:
IAA - Instituto de Astrofísica de Andalucía (CSIC), Apdo. 3004, 18008, Granada, Spain, email: sara@iaa.es
Josefa Masegosa
Affiliation:
IAA - Instituto de Astrofísica de Andalucía (CSIC), Apdo. 3004, 18008, Granada, Spain, email: sara@iaa.es
Isabel Márquez
Affiliation:
IAA - Instituto de Astrofísica de Andalucía (CSIC), Apdo. 3004, 18008, Granada, Spain, email: sara@iaa.es
Lorena Hernández-García
Affiliation:
Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Gran Bretaña1111, Playa Ancha, Chile
A. Álvarez-Hernández
Affiliation:
IAA - Instituto de Astrofísica de Andalucía (CSIC), Apdo. 3004, 18008, Granada, Spain, email: sara@iaa.es Departamento de Astrofísica, Universidad de La Laguna, E-38205La Laguna, Tenerife, Spain
Laura Hermosa-Muñoz
Affiliation:
IAA - Instituto de Astrofísica de Andalucía (CSIC), Apdo. 3004, 18008, Granada, Spain, email: sara@iaa.es
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Abstract

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Recent observations of local AGNs have revealed that many of them show a ‘changing look’ behavior at optical and X-rays wavelengths in the sense of transiting between different AGNs families (e.g. from type-1 to type-2 or vice-versa). In order to pinpoint the possible relation of the changes, we performed optical spectroscopic observations (with CAFOS/CAHA) of 15 changing look AGNs selected at X-rays. Highlights from our spectroscopic study are presented.

Keywords

galaxies: activegalaxies: kinematics and dynamicstechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 302 - 305
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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