The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs

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dc.contributor.authorLemon, C.
dc.contributor.authorAuger, M.
dc.contributor.authorAnguita, T.
dc.contributor.authorMcMahon, R.
dc.contributor.authorApostolovski, Y.
dc.contributor.authorChen, G.
dc.contributor.authorFassnacht, C.
dc.contributor.authorMelo, A.
dc.contributor.authorMotta, V.
dc.contributor.authorShajib, A.
dc.contributor.authorTreu, T.
dc.contributor.authorAgnello, A.
dc.contributor.authorBuckley-Geer, E
dc.contributor.authorSchechter, P.
dc.contributor.authorBirrer, S.
dc.contributor.authorCollett, T.
dc.contributor.authorCourbin, F.
dc.contributor.authorRusu, C.
dc.contributor.authorAbbott, T.
dc.contributor.authorAllam, S.
dc.contributor.authorAnnis, J.
dc.contributor.authorAvila, S.
dc.contributor.authorBertin, E.
dc.contributor.authorBrooks, D.
dc.contributor.authorBurke, D.
dc.contributor.authorCarnero Rosell, A.
dc.contributor.authorCarrasco Kind, M.
dc.contributor.authorCarretero, J.
dc.contributor.authorCostanzi, M.
dc.contributor.authorCosta, L.
dc.contributor.authorDe Vicente, J.
dc.contributor.authorDesai, S.
dc.contributor.authorEifler, T.
dc.contributor.authorFlaugher, B.
dc.contributor.authorFrieman, J.
dc.contributor.authorGarcia-Bellido, J.
dc.contributor.authorGaztanaga, E.
dc.contributor.authorGerdes, D.
dc.contributor.authorGruen, D.
dc.contributor.authorGruendl, R.
dc.contributor.authorGschwend, J.
dc.contributor.authorGutierrez, G.
dc.contributor.authorHonscheid, K.
dc.contributor.authorJames, D.
dc.contributor.authorKim, A.
dc.contributor.authorKrause, E.
dc.contributor.authorKuehn, K.
dc.contributor.authorKuropatkin, N.
dc.contributor.authorLahav, O.
dc.contributor.authorLima, M.
dc.contributor.authorLin, H.
dc.contributor.authorMaia, M.
dc.contributor.authorMarch, M.
dc.contributor.authorMarshall, J.
dc.contributor.authorMenanteau, F.
dc.contributor.authorMiquel, R.
dc.contributor.authorPalmese, A.
dc.contributor.authorPaz-Chinchon, F.
dc.contributor.authorPlazas, A.
dc.contributor.authorRoodman, A.
dc.contributor.authorSanchez, E.
dc.contributor.authorSchubnell, M.
dc.contributor.authorSerrano, S.
dc.contributor.authorSmith, M.
dc.contributor.authorSoares-Santos, M.
dc.contributor.authorSuchyta, E.
dc.contributor.authorTarle, G.
dc.contributor.authorWalker, A.
dc.date.accessioned2021-08-20T18:16:15Z
dc.date.available2021-08-20T18:16:15Z
dc.date.issued2020
dc.descriptionIndexación: Scopus.es
dc.description.abstractWe report the results of the STRong lensing Insights into the Dark Energy Survey (STRIDES) follow-up campaign of the late 2017/early 2018 season. We obtained spectra of 65 lensed quasar candidates with ESO Faint Object Spectrograph and Camera 2 on the NTT and Echellette Spectrograph and Imager onKeck, confirming 10 newlensed quasars and 10 quasar pairs. Eight lensed quasars are doubly imaged with source redshifts between 0.99 and 2.90, one is triply imaged (DESJ0345.2545, z = 1.68), and one is quadruply imaged (quad: DESJ0053.2012, z = 3.8). Singular isothermal ellipsoid models for the doubles, based on high-resolution imaging from SAMI on Southern Astrophysical Research Telescope or Near InfraRed Camera 2 on Keck, give total magnifications between 3.2 and 5.6, and Einstein radii between 0.49 and 1.97 arcsec. After spectroscopic follow-up, we extract multi-epoch grizY photometry of confirmed lensed quasars and contaminant quasar+star pairs from DES data using parametric multiband modelling, and compare variability in each system's components. By measuring the reduced χ2 associated with fitting all epochs to the samemagnitude, we find a simple cut on the less variable component that retains all confirmed lensed quasars, while removing 94 per cent of contaminant systems. Based on our spectroscopic follow-up, this variability information improves selection of lensed quasars and quasar pairs from 34-45 per cent to 51-70 per cent, with most remaining contaminants being star-forming galaxies. Using mock lensed quasar light curves we demonstrate that selection based only on variability will over-represent the quad fraction by 10 per cent over a complete DES magnitude-limited sample, explained by the magnification bias and hence lower luminosity/more variable sources in quads.es
dc.description.urihttps://academic.oup.com/mnras/article/494/3/3491/5801039
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Volume 494, Issue 3, Pages 3491 - 3511, 2020es
dc.identifier.doiDOI: 10.1093/MNRAS/STAA652
dc.identifier.issn0035-8711
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/19924
dc.language.isoenes
dc.publisherOxford University Presses
dc.subjectGravitational lensing: stronges
dc.subjectMethods: observationales
dc.subjectQuasars: generales
dc.subjectGravitational Lenseses
dc.subjectQuasarses
dc.subjectGalaxieses
dc.titleThe STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairses
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