Nine lensed quasars and quasar pairs discovered through spatially extended variability in Pan-STARRS

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dc.contributor.authorDux, Frederic
dc.contributor.authorLemon, Cameron
dc.contributor.authorCourbin, Frederic
dc.contributor.authorNeira, Favio
dc.contributor.authorAnguita, Timo
dc.contributor.authorGalan, Aymeric
dc.contributor.authorKim, Sam
dc.contributor.authorHempel, Maren
dc.contributor.authorHempel, Angela
dc.contributor.authorLachaume, Regis
dc.date.accessioned2025-01-20T17:07:26Z
dc.date.available2025-01-20T17:07:26Z
dc.date.issued2024
dc.description.abstractWe present the proof of concept of a method for finding strongly lensed quasars using their spatially extended photometric variability through difference imaging in cadenced imaging survey data. We applied the method to Pan-STARRS, starting with an initial selection of 14 107 Gaia multiplets with quasar-like infrared colours from WISE. We identified 229 candidates showing notable spatially extended variability during the Pan-STARRS survey period. These include 20 known lenses and an additional 12 promising candidates for which we obtained long-slit spectroscopy follow-up. This process resulted in the confirmation of four doubly lensed quasars, four unclassified quasar pairs, and one projected quasar pair. Only three are pairs of stars or quasar + star projections. The false-positive rate accordingly is 25%. The lens separations are between 0.81 '' and 1.24 '', and the source redshifts lie between z = 1 :47 and z = 2 :46. Three of the unclassified quasar pairs are promising dual-quasar candidates with separations ranging from 6.6 to 9.3 kpc. We expect that this technique is a particularly e fficient way to select lensed variables in the upcoming Rubin-LSST, which will be crucial given the expected limitations for spectroscopic follow-up.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202347598
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202347598
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90856
dc.identifier.wosidWOS:001163661300006
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectgravitation
dc.subjectgravitational lensing: strong
dc.subjectquasars: general
dc.titleNine lensed quasars and quasar pairs discovered through spatially extended variability in Pan-STARRS
dc.typeartículo
dc.volumen682
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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