Discovery of two gravitationally lensed quasars in the Dark Energy Survey
Creators: name: Agnello, Adriano
name: Treu, Tommaso
name: Ostrovski, Fernanda
name: Schechter, Paul L.
name: Buckley-Geer, Elizabeth J.
name: Lin, Huan
name: Auger, Matthew W.
name: Courbin, Frederic
name: Fassnacht, Christopher D.
name: Frieman, Josh
name: Kuropatkin, Nikolay
name: Marshall, Philip J.
name: McMahon, Richard G.
name: Meylan, Georges
name: More, Anupreeta
name: Suyu, Sherry H.
name: Rusu, Cristian E.
name: Finley, David
name: Abbott, Tim
name: Abdalla, Filipe B.
name: Allam, Sahar
name: Annis, James
name: Banerji, Manda
name: Benoit-Lévy, Aurélien
name: Bertin, Emmanuel
name: Brooks, David
name: Burke, David L.
name: Rosell, Aurelio Carnero
name: Kind, Matias Carrasco
name: Carretero, Jorge
name: Cunha, Carlos E.
name: D'Andrea, Chris B.
name: da Costa, Luiz N.
name: Desai, Shantanu
name: Diehl, H. Thomas
name: Dietrich, Jörg P.
name: Doel, Peter
name: Eifler, Tim F.
name: Estrada, Juan
name: Neto, Angelo Fausti
name: Flaugher, Brenna
name: Fosalba, Pablo
name: Gerdes, David W.
name: Gruen, Daniel
name: Gutierrez, Gaston
name: Honscheid, Klaus
name: James, David J.
name: Kuehn, Kyler
name: Lahav, Ofer
name: Lima, Marco
name: Maia, Marcio A. G.
name: March, Marina
name: Marshall, Jennifer L.
name: Martini, Paul
name: Melchior, Peter
name: Miller, Christopher J.
name: Miquel, Ramon
name: Nichol, Robert C.
name: Ogando, Ricardo
name: Plazas, Andres A.
name: Reil, Kevin
name: Romer, A. Kathy
name: Roodman, Aaron
name: Sako, Masao
name: Sanchez, Eusebio
name: Santiago, Basilio
name: Scarpine, Vic
name: Schubnell, Michael
name: Sevilla-Noarbe, Ignacio
name: Smith, R. Chris
name: Soares-Santos, Marcelle
name: Sobreira, Flavia
name: Suchyta, Eric
name: Swanson, Molly E. C.
name: Tarle, Gregory
name: Thaler, Jon
name: Tucker, Douglas
name: Walker, Alistair R.
name: Wechsler, Risa H.
name: Zhang, Yuanyuan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present spectroscopic confirmation of two new lensed quasars via data obtained at the 6.5m Magellan/Baade Telescope. The lens candidates have been selected from the Dark Energy Survey (DES) and WISE based on their multi-band photometry and extended morphology in DES images. Images of DES J0115-5244 show two blue point sources at either side of a red galaxy. Our long-slit data confirm that both point sources are images of the same quasar at $z_{s}=1.64.$ The Einstein Radius estimated from the DES images is $0.51$". DES J2200+0110 is in the area of overlap between DES and the Sloan Digital Sky Survey (SDSS). Two blue components are visible in the DES and SDSS images. The SDSS fiber spectrum shows a quasar component at $z_{s}=2.38$ and absorption compatible with Mg II and Fe II at $z_{l}=0.799$, which we tentatively associate with the foreground lens galaxy. The long-slit Magellan spectra show that the blue components are resolved images of the same quasar. The Einstein Radius is $0.68$" corresponding to an enclosed mass of $1.6\times10^{11}\,M_{\odot}.$ Three other candidates were observed and rejected, two being low-redshift pairs of starburst galaxies, and one being a quasar behind a blue star. These first confirmation results provide an important empirical validation of the data-mining and model-based selection that is being applied to the entire DES dataset.
description: 7 pages, 1 figure, 2 tables, MNRAS subm. This paper includes data gathered with the 6.5m Baade Telescopes located at Las Campanas Observatory, Chile. This paper has gone through internal review by the DES collaboration, FERMILAB-PUB-15-341-AE