Quasar lenses in the south: searches over the DES public footprint

Agnello, Adriano; Spiniello, Chiara

doi:10.1093/mnras/stz2200

Title: Quasar lenses in the south: searches over the DES public footprint

Journal Article · Mon Aug 12 00:00:00 EDT 2019 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stz2200· OSTI ID:1560740

^[1];

^[2]

European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany, DARK, Niels-Bohr Institute, Lyngbyvej 2, DK-2100 Copenhagen, Denmark
European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany, INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello, 16, I-80131 Napoli, Italy

ABSTRACT We have scanned 5000 deg2 of Southern Sky to search for strongly lensed quasars with five methods, all source oriented, but based on different assumptions and selection criteria. We present a list of high-grade candidates from each method (totalling 98 unique, new candidates), to facilitate follow-up spectroscopic campaigns, including two previously unknown quadruplets, WG 210014.9-445206.4 and WG 021416.37-210535.3. We analyse morphological searches based on Gaia multiplet detection and astrometric offsets, fibre-spectroscopic pre-selection, and X-ray and radio pre-selection. The performance and complementarity of the methods are evaluated on a common sample of known lenses in the Dark Energy Survey public Data Release 1 (DR1) footprint. We recovered in total 13 known lenses, of which 8 are quadruplets. Morphological and colour selection of objects, from the WISE andGaia-DR2 surveys, recovers most of those known lenses, but searches in the radio and X-ray cover regimes that are beyond the completeness of Gaia. Given the footprint, pre-selection, and depth limits, the current number of quads indicates that the union of these searches is complete, and the expected purity on high-grade candidates is $${\approx}60{{\ \rm per\ cent}}$$. Ongoing, spectroscopic campaigns confirm this estimate.

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Sponsoring Organization:: USDOE

OSTI ID:: 1560740

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 489 Journal Issue: 2; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 13 works

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