Madhooshi R Senarath
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
Authors
Michael JI Brown
Michelle E Cluver
Thomas H Jarrett
Christian Wolf
Nicholas P Ross
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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