Discovery of two gravitationally lensed quasars in the Dark Energy Survey

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

doi:10.1093/mnras/stv2171

Discovery of two gravitationally lensed quasars in the Dark Energy Survey

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

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Abstract

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.

Original language	English
Pages (from-to)	1260-1265
Journal	Monthly Notices of the Royal Astronomical Society
Volume	454
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stv2171
Publication status	Published - 1 Oct 2015

Keywords

astro-ph.GA
astro-ph.CO
gravitational lensing: strong
quasars: emission lines
methods: observational
methods: statistical
RCUK
STFC

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Agnello, A., Treu, T., Ostrovski, F., Schechter, P. L., Buckley-Geer, E. J., Lin, H., Auger, M. W., Courbin, F., Fassnacht, C. D., Frieman, J., Kuropatkin, N., Marshall, P. J., McMahon, R. G., Meylan, G., More, A., Suyu, S. H., Rusu, C. E., Finley, D., Abbott, T., ... Zhang, Y. (2015). Discovery of two gravitationally lensed quasars in the Dark Energy Survey. Monthly Notices of the Royal Astronomical Society, 454(2), 1260-1265. https://doi.org/10.1093/mnras/stv2171

@article{d8a8041ba11b4d6a9c9c5ecff33c0d66,

title = "Discovery of two gravitationally lensed quasars in the Dark Energy Survey",

abstract = "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.",

keywords = "astro-ph.GA, astro-ph.CO, gravitational lensing: strong, quasars: emission lines, methods: observational, methods: statistical, RCUK, STFC",

author = "Adriano Agnello and Tommaso Treu and Fernanda Ostrovski and Schechter, {Paul L.} and Buckley-Geer, {Elizabeth J.} and Huan Lin and Auger, {Matthew W.} and Frederic Courbin and Fassnacht, {Christopher D.} and Josh Frieman and Nikolay Kuropatkin and Marshall, {Philip J.} and McMahon, {Richard G.} and Georges Meylan and Anupreeta More and Suyu, {Sherry H.} and Rusu, {Cristian E.} and David Finley and Tim Abbott and Abdalla, {Filipe B.} and Sahar Allam and James Annis and Manda Banerji and Aur{\'e}lien Benoit-L{\'e}vy and Emmanuel Bertin and David Brooks and Burke, {David L.} and Rosell, {Aurelio Carnero} and Kind, {Matias Carrasco} and Jorge Carretero and Cunha, {Carlos E.} and D'Andrea, {Chris B.} and Costa, {Luiz N. da} and Shantanu Desai and Thomas Diehl and Dietrich, {J{\"o}rg P.} and Peter Doel and Eifler, {Tim F.} and Juan Estrada and Neto, {Angelo Fausti} and Brenna Flaugher and Pablo Fosalba and Gerdes, {David W.} and Daniel Gruen and Gaston Gutierrez and Klaus Honscheid and James, {David J.} and Kyler Kuehn and Ofer Lahav and Marco Lima and Maia, {Marcio A. G.} and Marisa March and Marshall, {Jennifer L.} and Paul Martini and Peter Melchior and Miller, {Christopher J.} and Ramon Miquel and Nichol, {Robert C.} and Ricardo Ogando and Plazas, {Andres A.} and Kevin Reil and Kathy Romer and Aaron Roodman and Masao Sako and Eusebio Sanchez and Basilio Santiago and Vic Scarpine and Michael Schubnell and Ignacio Sevilla-Noarbe and Chris Smith and Marcelle Soares-Santos and Flavia Sobreira and Eric Suchyta and Swanson, {Molly E. C.} and Gregory Tarle and Jon Thaler and Douglas Tucker and Walker, {Alistair R.} and Wechsler, {Risa H.} and Yuanyuan Zhang",

note = "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",

year = "2015",

month = oct,

day = "1",

doi = "10.1093/mnras/stv2171",

language = "English",

volume = "454",

pages = "1260--1265",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

Agnello, A, Treu, T, Ostrovski, F, Schechter, PL, Buckley-Geer, EJ, Lin, H, Auger, MW, Courbin, F, Fassnacht, CD, Frieman, J, Kuropatkin, N, Marshall, PJ, McMahon, RG, Meylan, G, More, A, Suyu, SH, Rusu, CE, Finley, D, Abbott, T, Abdalla, FB, Allam, S, Annis, J, Banerji, M, Benoit-Lévy, A, Bertin, E, Brooks, D, Burke, DL, Rosell, AC, Kind, MC, Carretero, J, Cunha, CE, D'Andrea, CB, Costa, LND, Desai, S, Diehl, T, Dietrich, JP, Doel, P, Eifler, TF, Estrada, J, Neto, AF, Flaugher, B, Fosalba, P, Gerdes, DW, Gruen, D, Gutierrez, G, Honscheid, K, James, DJ, Kuehn, K, Lahav, O, Lima, M, Maia, MAG, March, M, Marshall, JL, Martini, P, Melchior, P, Miller, CJ, Miquel, R, Nichol, RC, Ogando, R, Plazas, AA, Reil, K, Romer, K, Roodman, A, Sako, M, Sanchez, E, Santiago, B, Scarpine, V, Schubnell, M, Sevilla-Noarbe, I, Smith, C, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Thaler, J, Tucker, D, Walker, AR, Wechsler, RH & Zhang, Y 2015, 'Discovery of two gravitationally lensed quasars in the Dark Energy Survey', Monthly Notices of the Royal Astronomical Society, vol. 454, no. 2, pp. 1260-1265. https://doi.org/10.1093/mnras/stv2171

TY - JOUR

T1 - Discovery of two gravitationally lensed quasars in the Dark Energy Survey

AU - Agnello, Adriano

AU - Treu, Tommaso

AU - Ostrovski, Fernanda

AU - Schechter, Paul L.

AU - Buckley-Geer, Elizabeth J.

AU - Lin, Huan

AU - Auger, Matthew W.

AU - Courbin, Frederic

AU - Fassnacht, Christopher D.

AU - Frieman, Josh

AU - Kuropatkin, Nikolay

AU - Marshall, Philip J.

AU - McMahon, Richard G.

AU - Meylan, Georges

AU - More, Anupreeta

AU - Suyu, Sherry H.

AU - Rusu, Cristian E.

AU - Finley, David

AU - Abbott, Tim

AU - Abdalla, Filipe B.

AU - Allam, Sahar

AU - Annis, James

AU - Banerji, Manda

AU - Benoit-Lévy, Aurélien

AU - Bertin, Emmanuel

AU - Brooks, David

AU - Burke, David L.

AU - Rosell, Aurelio Carnero

AU - Kind, Matias Carrasco

AU - Carretero, Jorge

AU - Cunha, Carlos E.

AU - D'Andrea, Chris B.

AU - Costa, Luiz N. da

AU - Desai, Shantanu

AU - Diehl, Thomas

AU - Dietrich, Jörg P.

AU - Doel, Peter

AU - Eifler, Tim F.

AU - Estrada, Juan

AU - Neto, Angelo Fausti

AU - Flaugher, Brenna

AU - Fosalba, Pablo

AU - Gerdes, David W.

AU - Gruen, Daniel

AU - Gutierrez, Gaston

AU - Honscheid, Klaus

AU - James, David J.

AU - Kuehn, Kyler

AU - Lahav, Ofer

AU - Lima, Marco

AU - Maia, Marcio A. G.

AU - March, Marisa

AU - Marshall, Jennifer L.

AU - Martini, Paul

AU - Melchior, Peter

AU - Miller, Christopher J.

AU - Miquel, Ramon

AU - Nichol, Robert C.

AU - Ogando, Ricardo

AU - Plazas, Andres A.

AU - Reil, Kevin

AU - Romer, Kathy

AU - Roodman, Aaron

AU - Sako, Masao

AU - Sanchez, Eusebio

AU - Santiago, Basilio

AU - Scarpine, Vic

AU - Schubnell, Michael

AU - Sevilla-Noarbe, Ignacio

AU - Smith, Chris

AU - Soares-Santos, Marcelle

AU - Sobreira, Flavia

AU - Suchyta, Eric

AU - Swanson, Molly E. C.

AU - Tarle, Gregory

AU - Thaler, Jon

AU - Tucker, Douglas

AU - Walker, Alistair R.

AU - Wechsler, Risa H.

AU - Zhang, Yuanyuan

N1 - 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

PY - 2015/10/1

Y1 - 2015/10/1

N2 - 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.

AB - 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.

KW - astro-ph.GA

KW - astro-ph.CO

KW - gravitational lensing: strong

KW - quasars: emission lines

KW - methods: observational

KW - methods: statistical

KW - RCUK

KW - STFC

U2 - 10.1093/mnras/stv2171

DO - 10.1093/mnras/stv2171

M3 - Article

SN - 0035-8711

VL - 454

SP - 1260

EP - 1265

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

Discovery of two gravitationally lensed quasars in the Dark Energy Survey

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