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A gravitationally lensed quasar discovered in OGLE

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dc.abstract.enWe report the discovery of a new gravitationally lensed quasar (double) from the Optical Gravitational Lensing Experiment (OGLE) identified inside the ˜670deg<SUP>2</SUP> area encompassing the Magellanic Clouds. The source was selected as one of ˜60 `red W1 - W2' mid-infrared objects from WISE and having a significant amount of variability in OGLE for both two (or more) nearby sources. This is the first detection of a gravitational lens, where the discovery is made `the other way around', meaning we first measured the time delay between the two lensed quasar images of -132 < t<SUB>AB</SUB> < -76 d (90 per cent CL), with the median t<SUB>AB</SUB> ≈ -102 d (in the observer frame), and where the fainter image B lags image A. The system consists of the two quasar images separated by 1.5 arcsec on the sky, with I ≈ 20.0 mag and I ≈ 19.6 mag, respectively, and a lensing galaxy that becomes detectable as I ≈ 21.5 mag source, 1.0 arcsec from image A, after subtracting the two lensed images. Both quasar images show clear AGN broad emission lines at z = 2.16 in the New Technology Telescope spectra. The spectral energy distribution (SED) fitting with the fixed source redshift provided the estimate of the lensing galaxy redshift of z ≈ 0.9 ± 0.2 (90 per cent CL), while its type is more likely to be elliptical (the SED-inferred and lens-model stellar mass is more likely present in ellipticals) than spiral (preferred redshift by the lens model).
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKostrzewa-Rutkowska, Zuzanna
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorLemon, Cameron
dc.contributor.authorAnguita, T.
dc.contributor.authorGreiner, J.
dc.contributor.authorAuger, M. W.
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorApostolovski, Y.
dc.contributor.authorBolmer, J.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorPoleski, Radosław
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSkowron, Jan
dc.contributor.authorMróz, Przemysław
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorPawlak, Michał
dc.date.accessioned2024-01-24T17:39:11Z
dc.date.available2024-01-24T17:39:11Z
dc.date.copyright2018-01-25
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume476
dc.identifier.doi10.1093/MNRAS/STY259
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/101579
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018MNRAS.476..663K
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages663-672
dc.rightsOther
dc.sciencecloudnosend
dc.titleA gravitationally lensed quasar discovered in OGLE
dc.typeJournalArticle
dspace.entity.typePublication