Quasar Lenses and Galactic Streams: Outlier Selection and GAIA Multiplet Detection

Abstract

I describe two novel techniques originally devised to select strongly lensed quasar candidates in wide-field surveys. The first relies on outlier selection in optical and mid-infrared magnitude space; the second combines mid-infrared colour selection with GAIA spatial resolution, to identify multiplets of objects with quasar-like colours. Both methods have already been applied successfully to the SDSS, ATLAS and DES footprints: besides recovering known lenses from previous searches, they have led to new discoveries, including quadruply lensed quasars, which are rare within the rare-object class of quasar lenses. As a serendipitous by-product, at least four candidate Galactic streams in the South have been identified among foreground contaminants. There is considerable scope for tailoring the WISE-GAIA multiplet search to stellar-like objects, instead of quasar-like, and to automatically detect Galactic streams.

arXiv commentMNRAS subm. 21/04, revised version after referee report. 10 pages, 5 figures

References in corpus (58)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Gaia mission
• The Seventh Data Release of the Sloan Digital Sky Survey
• The Palomar Transient Factory: System Overview, Performance and First Results
• Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
• redMaPPer I: Algorithm and SDSS DR8 Catalog
• The Pan-STARRS1 Surveys
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data
• Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds
• Shapes and Shears, Stars and Smears: Optimal Measurements for Weak Lensing
• A Faint New Milky Way Satellite in Bootes
• Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
• Mid-Infrared Selection of Active Galactic Nuclei with the Wide-Field Infrared Survey Explorer. II. Properties of WISE-Selected Active Galactic Nuclei in the NDWFS Boötes Field
• The Cosmic Lens All-Sky Survey: I. Source selection and observations
• A New Milky Way Dwarf Satellite in Canes Venatici
• H0LiCOW I. $H_0$ Lenses in COSMOGRAIL's Wellspring: Program Overview
• Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way
• Sagittarius II, Draco II and Laevens 3: three new Milky Way satellites discovered in the Pan-STARRS 1 3pi Survey
• Think Outside the Color Box: Probabilistic Target Selection and the SDSS-XDQSO Quasar Targeting Catalog
• Segue 2: A Prototype of the Population of Satellites of Satellites
• redMaGiC: Selecting Luminous Red Galaxies from the DES Science Verification Data
• The Sloan Digital Sky Survey Quasar Lens Search. I. Candidate Selection Algorithm
• The Sloan Digital Sky Survey Quasar Lens Search. V. Final Catalog from the Seventh Data Release
• Microlensing of the broad line region in 17 lensed quasars
• A quadruply imaged quasar with an optical Einstein ring candidate: 1RXS J113155.4-123155
• The discovery of two extremely low luminosity Milky Way globular clusters
• The weirdest SDSS galaxies: results from an outlier detection algorithm
• The stellar and dark matter distributions in elliptical galaxies from the ensemble of strong gravitational lenses
• A Synoptic Map of Halo Substructures from the Pan-STARRS1 3π Survey
• HE 0435-1223: a wide separation quadruple QSO and gravitational lens
• WFI J2026-4536 and WFI J2033-4723: Two New Quadruple Gravitational Lenses
• ATLAS lifts the Cup: Discovery of a New Milky Way satellite in Crater
• The devil is in the tails: the role of globular cluster mass evolution on stream properties
• A calibration of the stellar mass fundamental plane at z ~ 0.5 using the micro-lensing induced flux ratio anomalies of macro-lensed quasars
• The Color Variability of Quasars
• VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning
• Gaia 1 and 2. A pair of new Galactic star clusters
• Quasar Probabilities and Redshifts from WISE mid-IR through GALEX UV Photometry
• Data Mining for Gravitationally Lensed Quasars
• Gaia data release 1, the photometric data
• The Phoenix stream: a cold stream in the Southern hemisphere
• Discovery of two gravitationally lensed quasars in the Dark Energy Survey
• A microlensing measurement of dark matter fractions in three lensing galaxies
• Observations of radio-quiet quasars at 10mas resolution by use of gravitational lensing
• CHITAH: Strong-gravitational-lens hunter in imaging surveys
• Discovery of a Stellar Overdensity in Eridanus-Phoenix in the Dark Energy Survey
• Discovery of the Lensed Quasar System DES J0408-5354
• Exploring the SDSS Photometric Galaxies with Clustering Redshifts
• H0LiCOW VI. Testing the fidelity of lensed quasar host galaxy reconstruction
• Exploring the 2MASS Extended and Point Source Catalogs with Clustering Redshifts
• The 2QDES Pilot : The luminosity and redshift dependence of quasar clustering
• A Study of Quasar Selection in the Dark Energy Survey Supernova fields
• Models of the strongly lensed quasar DES J0408-5354
• Discovery and first models of the quadruply lensed quasar SDSS J1433+6007
• Population mixtures and searches of lensed and extended quasars across photometric surveys
• A Global Correction to PPMXL Proper Motions
• Polarization microlensing in the quadruply imaged broad absorption line quasar H1413+117

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• Stellar Streams Discovered in the Dark Energy Survey
• A SHARP view of H0LiCOW: $H_0$ from three time-delay gravitational lens systems with adaptive optics imaging
• Gravitationally Lensed Quasars in Gaia: II. Discovery of 24 Lensed Quasars
• galstreams: A Library of Milky Way Stellar Stream Footprints and Tracks
• Fourteen candidate RR Lyrae star streams in the inner Galaxy
• COSMOGRAIL XVII: Time delays for the quadruply imaged quasar PG 1115+080
• The STRong lensing Insights into the Dark Energy Survey (STRIDES) 2016 follow-up campaign. I. Overview and classification of candidates selected by two techniques
• DES meets Gaia: discovery of strongly lensed quasars from a multiplet search
• The STRong lensing Insights into the Dark Energy Survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs
• Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). IV. Lensed quasar search in the HSC survey
• Quasar lenses and pairs in the VST-ATLAS and Gaia
• Constraining the microlensing effect on time delays with new time-delay prediction model in $H_0$ measurements
• The Milky Way's stellar streams and globular clusters do not align in a Vast Polar Structure
• Data mining techniques on astronomical spectra data. II : Classification Analysis
• Models of the strongly lensed quasar DES J0408-5354
• Discovery and first models of the quadruply lensed quasar SDSS J1433+6007
• Quasar Lenses in the South: searches over the DES public footprint
• A Survey for High-redshift Gravitationally Lensed Quasars and Close Quasars Pairs. I. the Discoveries of an Intermediately-lensed Quasar and a Kpc-scale Quasar Pair at $z\sim 5$
• Discovery of three strongly lensed quasars in the Sloan Digital Sky Survey
• Lensed quasar search via time variability with the HSC transient survey
• Strongly lensed candidates from the HSC transient survey
• Gaia space mission and quasars