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A systematic survey for z< 0.04 CLAGNs

Senarath, Madhooshi R; Brown, Michael JI; Cluver, Michelle E; Jarrett, Thomas H; Wolf, Christian; Ross, Nicholas P; Lucey, John R; Parkash, Vaishali; Hon, Wei J

A systematic survey for z< 0.04 CLAGNs Thumbnail


Authors

Madhooshi R Senarath

Michael JI Brown

Michelle E Cluver

Thomas H Jarrett

Christian Wolf

Nicholas P Ross

Profile image of John Lucey

John Lucey john.lucey@durham.ac.uk
Emeritus Professor

Vaishali Parkash

Wei J Hon



Abstract

We have conducted a systematic survey for z < 0.04 active Galactic nuclei (AGNs) that may have changed spectral class over the past decade. We use SkyMapper, Pan-STARRS and the Véron-Cetty & Véron catalogue to search the entire sky for these ‘changing-look’ AGNs (CLAGNs) using a variety of selection methods, where Pan-STARRS has a coverage of 3π steradians (sky north of Declination −30○) and SkyMapper has coverage of ∼21000  deg2 (sky south of Declination 0○). We use small aperture photometry to measure how colour and flux have changed over time, where a change may indicate a change in spectral type. Optical colour and flux are used as a proxy for changing Hα equivalent width, while WISE 3.4 μm flux is used to look for changes in the hot dust component. We have identified four AGNs with varying spectra selected using our optical colour selection method. Three AGNs were confirmed from recent observations with WiFeS on the 2.3 m telescope at Siding Spring and the other was identified from archival spectra alone. From this, we identify two new CLAGNs; NGC 1346 and 2MASX J20075129–1108346. We also recover Mrk 915 and Mrk 609, which are known to have varying spectra in the literature, but they do not meet our specific criteria for CLAGNs.

Citation

Senarath, M. R., Brown, M. J., Cluver, M. E., Jarrett, T. H., Wolf, C., Ross, N. P., …Hon, W. J. (2021). A systematic survey for z< 0.04 CLAGNs. Monthly Notices of the Royal Astronomical Society, 503(2), 2583-2597. https://doi.org/10.1093/mnras/stab393

Journal Article Type Article
Acceptance Date Feb 8, 2021
Online Publication Date Feb 13, 2021
Publication Date 2021-05
Deposit Date Aug 25, 2021
Publicly Available Date Aug 25, 2021
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 503
Issue 2
Pages 2583-2597
DOI https://doi.org/10.1093/mnras/stab393
Public URL https://durham-repository.worktribe.com/output/1242243

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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