Lensed and extended quasars : J/MNRAS/466/3088


Authors : Williams P. orcid , Agnello A., Treu T. (hide) , Agnello A., Treu T. et..al

Bibcode : 2017MNRAS.466.3088W (ADS) (Simbad) (Objects) (hide)

CDS Keywords : QSOs; Gravitational lensing
UAT : Quasars, Gravitational lensing

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Inserted into VizieR : 27-Nov-2019
Last modification : 17-Aug-2024

Population mixtures and searches of lensed and extended quasars across photometric surveys. (2017)

Keywords : gravitational lensing strong - methods: statistical - catalogues

Abstract:Wide-field photometric surveys enable searches of rare yet interesting objects, such as strongly lensed quasars or quasars with a bright host galaxy. Past searches for lensed quasars based on their optical and near-infrared properties have relied on photometric cuts and spectroscopic preselection (as in the Sloan Quasar Lens Search), or neural networks applied to photometric samples. These methods rely on cuts in morphology and colours, with the risk of losing many interesting objects due to scatter in their population properties, restrictive training sets, systematic uncertainties in catalogue-based magnitudes and survey-to-survey photometric variations. Here, we explore the performance of a Gaussian mixture model to separate ...(more)
Abstract: (hide)
We finalize our tests of the Gaussian mixture model by examining how it classifies known lenses. Of a list of known lenses, 128 lie in the SDSS footprint for which we can obtain colours and calculate membership probabilities (table 2). From our visual inspection scores, we have 43 objects with score greater than 1.5, after eliminating all contaminants based on the spectroscopic information. These are listed in Table 3


                
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