Journal article

Changing look active galactic nuclei in the MaNGA survey

Wei Jeat Hon, Rachel Webster, Christian Wolf

Monthly Notices of the Royal Astronomical Society | Oxford University Press (OUP) | Published : 2020

Abstract

Changing look active galactic nuclei (CLAGNs) are rare cases of AGNs, where the continuum flux increases/decreases and the broad emission lines appear/disappear within short time-scales. These extreme changes challenge our understanding of accretion disc dynamics. We present a sample of four new CLAGNs at 0.026 < z |0.5| mag change in SDSS-g band is ineffective at lower redshifts. This is, in part, due to the fact that the g band is probing a different part of the AGNs spectral energy distribution at these redshifts. The bigger issue is that the galaxy continuum dominates the spectrum and thus overwhelms any variation of the AGNs continuum that might contribute to photometric variations. Thi..

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University of Melbourne Researchers

Grants

Awarded by National Aeronautics and Space Administration through the Science Mission Directorate Near-Earth Objects Observations Program


Awarded by U.S. National Science Foundation


Awarded by Gordon and Betty Moore Foundation


Awarded by NSF


Funding Acknowledgements

WJH would like to thank the University of Melbourne for an International Graduate Research Scholarship. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS web site is www.sdss.org.SDSSIV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration. The CSS survey is funded by the National Aeronautics and Space Administration under Grant No. NNG05GF22G issued through the Science Mission Directorate Near-Earth Objects Observations Program. The CRTS survey is supported by the U.S. National Science Foundation under grants AST-0909182 and AST-1313422. The ASAS-SN survey is partially funded by Gordon and Betty Moore Foundation with a 5-yr grant GBMF5490. The team is also supported by NSF Grants AST-151592 and AST-1908570. The survey telescopes are hosted by LCO global. ASAS-SN expansion was also possible with support from: Peking University, Mt. Cuba Astronomical Foundation, OSU Center for Cosmology and AstroParticle Physics (CCAPP), the Chinese Academy of Science South America Center for Astronomy (CAS-SACA), and the Villum Foundation (Denmark). This publication makes use of data products from the Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE), which is a project of the Jet Propulsion Laboratory/California Institute of Technology. NEOWISE is funded by the National Aeronautics and Space Administration. We greatly appreciate Katie Auchettl and Michele Trenti from the University of Melbourne for comments in improving the manuscript. We are also grateful to the referee for helpful suggestions.