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Discovery of two quasars at z = 5 from the OGLE Survey

MPG-Autoren
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Rau,  A.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Greiner,  J.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Zitation

Kozłowski, S., Bañados, E., Udalski, A., Morrell, N., Ji, A. P., Wyrzykowski, Ł., et al. (2020). Discovery of two quasars at z = 5 from the OGLE Survey. The Astrophysical Journal, 878(2): 115. doi:10.3847/1538-4357/ab20d1.


Zitierlink: https://hdl.handle.net/21.11116/0000-0006-5EAD-F
Zusammenfassung
We 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 deg2, 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.