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

Kozłowski, Szymon; Bañados, Eduardo; Udalski, A.; Morrell, N.; Ji, A. P.; Wyrzykowski, Ł.; Rau, A.; Mróz, P.; Greiner, J.; Gromadzki, M.; Szymański, M. K.; Soszyński, I.; Poleski, R.; Pietrukowicz, P.; Skowron, J.; Skowron, D. M.; Ulaczyk, K.; Rybicki, K.; Iwanek, P.; Wrona, M.

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

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

MPS-Authors

Kozłowski, Szymon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bañados, Eduardo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Udalski, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Morrell, N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ji, A. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wyrzykowski, Ł.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rau, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mróz, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Greiner, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gromadzki, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Szymański, M. K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Soszyński, I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Poleski, R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pietrukowicz, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skowron, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skowron, D. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ulaczyk, K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rybicki, K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Iwanek, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wrona, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...878..115K
(Any fulltext)

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Kozłowski, S., Bañados, E., Udalski, A., Morrell, N., Ji, A. P., Wyrzykowski, Ł., et al. (2019). Discovery of Two Quasars at z = 5 from the OGLE Survey. The Astrophysical Journal, 878.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D0A2-8

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.