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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 731604.0, MPI für Astronomie / Publikationen_mpia
Finding, characterizing and classifying variable sources in multi-epoch sky surveys: QSOs and RR Lyraes in PS1 3Pi
Authors:Hernitschek, N.; Schlafly, E. F.; Sesar, B.; Rix, H. -. W.; Hogg, D. W.; Ivezic, Z.; Grebel, E. K.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Commmunications of the Konkoly Observatory Hungary
Volume:105
Start Page:85
End Page:92
Audience:Not Specified
Abstract / Description:We develop a new approach for quantifying statistical properties of non-simultaneous, sparse, multi-color light curves through light-curve structure functions. Using PS1 data on SDSS Stripe 82 as "ground truth", a Random Forest Classifier identifies QSOs and RR Lyrae stars based on their variability and mean PS1 and WISE colors. We find that, aside from the Galactic plane, QSO and RR Lyrae samples of purity 75% and completeness 92% can be selected. On this completeness and purity basis we have identified a QSO candidate sample of a million objects, including many at low latitudes. We have assembled an unprecedentedly large and deep sample of 150 000 likely RR Lyrae candidates, with distances from 10 kpc to 120 kpc. We provide a catalog of 2.6 x 107 likely variable point sources. This work illustrates the power of time- domain surveys to identify variable objects and opens up enormous follow-up possibilities.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0324-2234
URL:http://adsabs.harvard.edu/abs/2016CoKon.105...85H
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