Long-term NIR Variability in the UKIDSS Ultra Deep Survey: a new probe of AGN activity at high redshift.

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dc.contributor.authorElmer, E.
dc.contributor.authorAlmaini, O.
dc.contributor.authorMerrifield, M.
dc.contributor.authorHartley, W. G.
dc.contributor.authorMaltby, D. T.
dc.contributor.authorBotti, Ismael
dc.contributor.authorLawrence, A.
dc.contributor.authorHirst, P.
dc.date.accessioned2021-08-24T21:03:40Z
dc.date.available2021-08-24T21:03:40Z
dc.date.issued2019
dc.description.abstractWe present the first attempt to select AGN using long-term NIR variability. By analysing the K-band light curves of all the galaxies in the UKIDSS Ultra Deep Survey, the deepest NIR survey over ∼ 1 sq degree, we have isolated 393 variable AGN candidates. A comparison to other selection techniques shows that only half of the variable sources are also selected using either deep Chandra X-ray imaging or IRAC colour selection, suggesting that using NIR variability can locate AGN that are missed by more standard selection techniques. In particular, we find that long-term NIR variability identifies AGN at low luminosities and in host galaxies with low stellar masses, many of which appear relatively X-ray quiet.es
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2019:1-11es
dc.identifier.urihttps://doi.org/10.1093/mnras/staa381es
dc.identifier.urihttp://hdl.handle.net/11447/4458
dc.language.isoenes
dc.subjectGalaxies: activees
dc.subjectInfrared: galaxieses
dc.subjectSurveyses
dc.subjectX-rays: galaxieses
dc.titleLong-term NIR Variability in the UKIDSS Ultra Deep Survey: a new probe of AGN activity at high redshift.es
dc.typeArticlees

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