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Discovery of Two Quasars at z = 5 from the OGLE Survey

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cris.lastimport.scopus2024-02-12T19:39:05Z
dc.abstract.enWe used Optical Gravitational Lensing Experiment (OGLE-IV) deep (stacked) images (V ≲ 23 mag, I ≲ 23 mag at 3σ) of the Magellanic System, encompassing an area of ˜670 deg<SUP>2</SUP>, to perform a search for high-z quasar candidates. We combined the optical OGLE data with the mid-IR Wide-field Infrared Survey Explorer 3.4/4.6/12 μm data, and devised a multicolor selection procedure. We identified 33 promising candidates and then spectroscopically observed the two most variable sources. We report the discovery of two high-z quasars, OGLE J015531-752807 at a redshift z = 5.09 and OGLE J005907-645016 at a redshift of z = 4.98. The variability amplitude of both quasars at the rest-frame wavelength ˜1300 Å is much larger (˜0.4 mag) than other quasars (˜0.15 mag) at the same rest-frame wavelength but lower redshifts (2 < z < 5). A larger sample of such sources with at least decade-long light curves would be necessary to determine whether increased variability is typical in the population of high-z quasars, or whether we are finding extreme outliers. The Large Synoptic Survey Telescope will provide such light curves for sources 3-4 mag fainter than OGLE.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorBañados, Eduardo
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorMorrell, N.
dc.contributor.authorJi, A. P.
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorRau, A.
dc.contributor.authorMróz, Przemysław
dc.contributor.authorGreiner, J.
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorPoleski, Radosław
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSkowron, Jan
dc.contributor.authorSkowron, Dorota
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorIwanek, Patryk
dc.contributor.authorWrona, Marcin
dc.date.accessioned2024-01-24T21:54:50Z
dc.date.available2024-01-24T21:54:50Z
dc.date.copyright2018-10-19
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume878
dc.identifier.doi10.3847/1538-4357/AB20D1
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/104981
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019ApJ...878..115K
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages115
dc.rightsOther
dc.sciencecloudnosend
dc.titleDiscovery of Two Quasars at z = 5 from the OGLE Survey
dc.typeJournalArticle
dspace.entity.typePublication