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

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-5EAD-F Version Permalink: http://hdl.handle.net/21.11116/0000-0006-5EC9-F
Genre: Journal Article

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 Creators:
Kozłowski, Szymon, Author
Bañados, Eduardo, Author
Udalski, A., Author
Morrell, N., Author
Ji, A. P., Author
Wyrzykowski, Ł., Author
Rau, A.1, Author              
Mróz, P., Author
Greiner, J.1, Author              
Gromadzki, M., Author
Szymański, M. K., Author
Soszyński, I., Author
Poleski, R., Author
Pietrukowicz, P., Author
Skowron, J., Author
Skowron, D. M., Author
Ulaczyk, K., Author
Rybicki, K., Author
Iwanek, P., Author
Wrona, M., Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: 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.

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 Dates: 2020-06-20
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab20d1
Other: LOCALID: 3230099
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 878 (2) Sequence Number: 115 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3