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Discovery of two gravitationally lensed quasars in the Dark Energy Survey

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Discovery of two gravitationally lensed quasars in the Dark Energy Survey

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Título Discovery of two gravitationally lensed quasars in the Dark Energy Survey
Autor Agnello, Adriano
Treu, Tommaso
Ostrovski, F.
Schechter, Paul L.
Buckley-Geer, Elizabeth
Lin, H.
Auger, Matthew W.
Courbin, Frederic Y. M.
Fassnacht, Christopher D.
Frieman, Joshua A.
Kuropatkin, Nikolay P.
Marshall, Phillip J.
McMahon, Richard G.
Meylan, Georges
More, Andrew Mills
Suyu, Sherry
Rusu, Cristian Eduard
Finley, David A.
Abbott, Timothy M. C.
Abdalla, Filipe B.
Allam, Sahar S.
Annis, James T.
Banerji, M.
Benoit-Lévy, Aurélien
Bertin, Emmanuel
Brooks, D.
Burke, David Lyle
Carnero Rosell, Aurelio
Carrasco Kind, Matías
Carretero Palacios, Jorge
Cunha, Carlos Eduardo
D'Andrea, Christopher B.
Costa, Luiz N. da
Desai, S.
Diehl, H. Thomas
Dietrich, Jörg P.
Doel, Peter
Eifler, Tim
Estrada, Juan
Fausti Neto, Angelo
Flaugher, Brenna
Fosalba Vela, Pablo
Gerdes, David W.
Gruen, Daniel
Gutierrez, Gaston R.
Honscheid, K.
James, David J.
Kent, Stephen M.
Kuehn, Kyler
Kuropatkin, Nikolay P.
Lahav, Ofer
Lima, Marcos Vinicius Borges Teixeira
Maia, Marcio Antonio Geimba
March, Marisa Cristina
Marshall, Jennifer L.
Martini, Paul
Melchior, Peter M.
Miller, Christopher J.
Miquel, Ramon
Nichol, Robert C.
Ogando, Ricardo L.C.
Plazas Malagón, Andrés Alejandro
Reil, Kevin
Romer, Anita K.
Roodman, Aaron
Sako, Masao
Sanchez-Alvaro, Eusebio
Santiago, Basilio Xavier
Scarpine, Victor Emanuel
Schubnell, Michael
Sevilla Noarbe, Ignacio
Smith, Robert Christopher
Soares-Santos, Marcelle
Sobreira, Flávia
Suchyta, Eric
Swanson, Molly E. C.
Tarle, Gregory
Thaler, Jon J.
Tucker, Douglas L.
Walker, Alistair
Wechsler, Risa H.
Zhang, Y.
Abstract We present spectroscopic confirmation of two new gravitationally lensed quasars, discovered in the Dark Energy Survey (DES) and Wide-field Infrared Survey Explorer (WISE) based on their multiband photometry and extended morphology in DES images. Images of DES J0115−5244 show a red galaxy with two blue point sources at either side, which are images of the same quasar at zs = 1.64 as obtained by our long-slit spectroscopic data. The Einstein radius estimated from the DES images is 0.51 arcsec. DES J2146−0047 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 fibre spectrum shows a quasar component at zs = 2.38 and absorption by Mg II and Fe II at zl = 0.799, which we tentatively associate with the foreground lens galaxy. Our long-slit spectra show that the blue components are resolved images of the same quasar. The Einstein radius is 0.68 arcsec, corresponding to an enclosed mass of 1.6 × 1011M . 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 data set.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 454, no. 2 (Dec. 2015), p. 1260-1265
Assunto Galaxias
Quasars
[en] Gravitational lensing: strong
[en] Methods: observational
[en] Methods: statistical
[en] Quasars: emission lines
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/140371
Arquivos Descrição Formato
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