Discovery of two gravitationally lensed quasars in the Dark Energy Survey
Discovery of two gravitationally lensed quasars in the Dark Energy Survey
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.
Tommaso Treu、David W. Gerdes、Nikolay Kuropatkin、James Annis、Kyler Kuehn、Christopher D. Fassnacht、R. Chris Smith、Matthew W. Auger、Ofer Lahav、Marcelle Soares-Santos、Georges Meylan、Sahar Allam、Paul Martini、Risa H. Wechsler、Molly E. C. Swanson、Jorge Carretero、Ricardo Ogando、Daniel Gruen、Jennifer L. Marshall、Josh Frieman、Flavia Sobreira、Peter Doel、Shantanu Desai、Philip J. Marshall、Pablo Fosalba、Peter Melchior、David J. James、Aur¨|lien Benoit-L¨|vy、Luiz N. da Costa、David L. Burke、Eusebio Sanchez、Masao Sako、Fernanda Ostrovski、Douglas Tucker、Anupreeta More、Frederic Courbin、Aaron Roodman、Elizabeth J. Buckley-Geer、Christopher J. Miller、H. Thomas Diehl、Michael Schubnell、Emmanuel Bertin、Paul L. Schechter、Gaston Gutierrez、Matias Carrasco Kind、Brenna Flaugher、Marina March、David Finley、Huan Lin、Jon Thaler、Ignacio Sevilla-Noarbe、Robert C. Nichol、Adriano Agnello、Marcio A. G. Maia、Cristian E. Rusu、Andres A. Plazas、Tim F. Eifler、Eric Suchyta、Klaus Honscheid、Angelo Fausti Neto、Vic Scarpine、Sherry H. Suyu、Gregory Tarle、Basilio Santiago、Aurelio Carnero Rosell、Yuanyuan Zhang、Filipe B. Abdalla、Manda Banerji、Ramon Miquel、Richard G. McMahon、J?rg P. Dietrich、David Brooks、Kevin Reil、Juan Estrada、Alistair R. Walker、Chris B. D'Andrea、Tim Abbott、Carlos E. Cunha、A. Kathy Romer、Marco Lima
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Tommaso Treu,David W. Gerdes,Nikolay Kuropatkin,James Annis,Kyler Kuehn,Christopher D. Fassnacht,R. Chris Smith,Matthew W. Auger,Ofer Lahav,Marcelle Soares-Santos,Georges Meylan,Sahar Allam,Paul Martini,Risa H. Wechsler,Molly E. C. Swanson,Jorge Carretero,Ricardo Ogando,Daniel Gruen,Jennifer L. Marshall,Josh Frieman,Flavia Sobreira,Peter Doel,Shantanu Desai,Philip J. Marshall,Pablo Fosalba,Peter Melchior,David J. James,Aur¨|lien Benoit-L¨|vy,Luiz N. da Costa,David L. Burke,Eusebio Sanchez,Masao Sako,Fernanda Ostrovski,Douglas Tucker,Anupreeta More,Frederic Courbin,Aaron Roodman,Elizabeth J. Buckley-Geer,Christopher J. Miller,H. Thomas Diehl,Michael Schubnell,Emmanuel Bertin,Paul L. Schechter,Gaston Gutierrez,Matias Carrasco Kind,Brenna Flaugher,Marina March,David Finley,Huan Lin,Jon Thaler,Ignacio Sevilla-Noarbe,Robert C. Nichol,Adriano Agnello,Marcio A. G. Maia,Cristian E. Rusu,Andres A. Plazas,Tim F. Eifler,Eric Suchyta,Klaus Honscheid,Angelo Fausti Neto,Vic Scarpine,Sherry H. Suyu,Gregory Tarle,Basilio Santiago,Aurelio Carnero Rosell,Yuanyuan Zhang,Filipe B. Abdalla,Manda Banerji,Ramon Miquel,Richard G. McMahon,J?rg P. Dietrich,David Brooks,Kevin Reil,Juan Estrada,Alistair R. Walker,Chris B. D'Andrea,Tim Abbott,Carlos E. Cunha,A. Kathy Romer,Marco Lima.Discovery of two gravitationally lensed quasars in the Dark Energy Survey[EB/OL].(2015-08-05)[2025-06-17].https://arxiv.org/abs/1508.01203.点此复制
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