Discovery of two gravitationally lensed quasars in the Dark Energy Survey

A. Agnello; T. Treu; F. Ostrovski; P. L. Schechter; E. J. Buckley-Geer; H. Lin; M. W. Auger; F. Courbin; C. D. Fassnacht; J. Frieman; N. Kuropatkin; P. J. Marshall; R. G. McMahon; G. Meylan; A. More; S. H. Suyu; C. E. Rusu; D. Finley; T. Abbott; F. B. Abdalla; S. Allam; J. Annis; M. Banerji; A. Benoit-Lévy; E. Bertin; D. Brooks; D. L. Burke; A. Carnero Rosell; M. Carrasco Kind; J. Carretero; C. E. Cunha; C. B. D'Andrea; L. N. da Costa; S. Desai; H. T. Diehl; J. P. Dietrich; P. Doel; T. F. Eifler; J. Estrada; A. Fausti Neto; B. Flaugher; P. Fosalba; D. W. Gerdes; D. Gruen; G. Gutierrez; K. Honscheid; D. J. James; K. Kuehn; O. Lahav; M. Lima; M. A.G. Maia; M. March; J. L. Marshall; P. Martini; P. Melchior; C. J. Miller; R. Miquel; R. C. Nichol; R. Ogando; A. A. Plazas; K. Reil; A. K. Romer; A. Roodman; M. Sako; E. Sanchez; B. Santiago; V. Scarpine; M. Schubnell; I. Sevilla-Noarbe; R. C. Smith; M. Soares-Santos; F. Sobreira; E. Suchyta; M. E.C. Swanson; G. Tarle; J. Thaler; D. Tucker; A. R. Walker; R. H. Wechsler; Y. Zhang

doi:10.1093/mnras/stv2171

Discovery of two gravitationally lensed quasars in the Dark Energy Survey

A. Agnello, T. Treu, F. Ostrovski, P. L. Schechter, E. J. Buckley-Geer, H. Lin, M. W. Auger, F. Courbin, C. D. Fassnacht, J. Frieman, N. Kuropatkin, P. J. Marshall, R. G. McMahon, G. Meylan, A. More, S. H. Suyu, C. E. Rusu, D. Finley, T. Abbott, F. B. AbdallaS. Allam, J. Annis, M. Banerji, A. Benoit-Lévy, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, C. E. Cunha, C. B. D'Andrea, L. N. da Costa, S. Desai, H. T. Diehl, J. P. Dietrich, P. Doel, T. F. Eifler, J. Estrada, A. Fausti Neto, B. Flaugher, P. Fosalba, D. W. Gerdes, D. Gruen, G. Gutierrez, K. Honscheid, D. J. James, K. Kuehn, O. Lahav, M. Lima, M. A.G. Maia, M. March, J. L. Marshall, P. Martini, P. Melchior, C. J. Miller, R. Miquel, R. C. Nichol, R. Ogando, A. A. Plazas, K. Reil, A. K. Romer, A. Roodman, M. Sako, E. Sanchez, B. Santiago, V. Scarpine, M. Schubnell, I. Sevilla-Noarbe, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E.C. Swanson, G. Tarle, J. Thaler, D. Tucker, A. R. Walker, R. H. Wechsler, Y. Zhang

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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 z_s = 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 z_s = 2.38 and absorption by Mg II and Fe II at z_l = 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.

Original language	English
Pages (from-to)	1260-1265
Number of pages	6
Journal	Monthly Notices of the Royal Astronomical Society
Volume	454
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stv2171
State	Published - 2015
Externally published	Yes

Funding

This Letter includes data gathered with the 6.5m Baade Telescopes located at Las Campanas Observatory, Chile. AA, TT, CDF and CER acknowledge support from NSF grants AST-1312329 and AST-1450141 'Collaborative Research: Accurate cosmology with strong gravitational lens time delays'. AA and TT gratefully acknowledge support by the Packard Foundation through a Packard Research Fellowship to TT. SHS acknowledges support from the Ministry of Science and Technology in Taiwan via grant MOST-103-2112-M-001-003-MY3. FC andGMare supported by the Swiss National Science Foundation (SNSF). The work of PJM was supported by the US Department of Energy under contract number DE-AC02-76SF00515. We thank Tamara Davis, Cristina Furlanetto, Gary Bernstein and Tom Collett for useful comments on earlier versions of this Letter. This Letter has gone through internal review by the DES collaboration. Funding for the DES Projects has been provided by the DOE and NSF (USA), MISE (Spain), STFC (UK), HEFCE (UK). NCSA (UIUC), KICP (U. Chicago), CCAPP (Ohio State), MIFPA (Texas A&M), CNPQ, FAPERJ, FINEP (Brazil), MINECO (Spain), DFG (Germany) and the Collaborating Institutions in the Dark Energy Survey. The Collaborating Institutions are Argonne Lab, UC Santa Cruz, University of Cambridge, CIEMAT-Madrid, University of Chicago, University College London, DES-Brazil Consortium, University of Edinburgh, ETH Zürich, Fermilab, University of Illinois, ICE (IEEC-CSIC), IFAE Barcelona, Lawrence Berkeley Lab, LMU München and the associated Excellence Cluster Universe, University of Michigan, NOAO, University of Nottingham, Ohio State University, University of Pennsylvania, University of Portsmouth, SLAC National Lab, Stanford University, University of Sussex, and Texas A&M University. The DES Data Management System is supported by the NSF under grant number AST-1138766. The DES participants from Spanish institutions are partially supported byMINECO under grants AYA2012-39559, ESP2013-48274, FPA2013-47986 and Centro de Excelencia Severo Ochoa SEV-2012-0234. Research leading to these results has received funding from the ERC under the EU's 7th Framework Programme including grants ERC 240672, 291329 and 306478.

Funders	Funder number
National Science Foundation	1138766, 1312329, 240672, 306478, 291329, 1450141
University of Chicago
University of Cambridge
European Research Council

Keywords

Quasars: emission lines
gravitational lensing: strong -methods: observational -methods: statistical

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10.1093/mnras/stv2171

Cite this

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{f903a58c66c64f5db7d23771873a1156,

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

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.",

keywords = "Quasars: emission lines, gravitational lensing: strong -methods: observational -methods: statistical",

author = "A. Agnello and T. Treu and F. Ostrovski and Schechter, {P. L.} and Buckley-Geer, {E. J.} and H. Lin and Auger, {M. W.} and F. Courbin and Fassnacht, {C. D.} and J. Frieman and N. Kuropatkin and Marshall, {P. J.} and McMahon, {R. G.} and G. Meylan and A. More and Suyu, {S. H.} and Rusu, {C. E.} and D. Finley and T. Abbott and Abdalla, {F. B.} and S. Allam and J. Annis and M. Banerji and A. Benoit-L{\'e}vy and E. Bertin and D. Brooks and Burke, {D. L.} and {Carnero Rosell}, A. and {Carrasco Kind}, M. and J. Carretero and Cunha, {C. E.} and D'Andrea, {C. B.} and {da Costa}, {L. N.} and S. Desai and Diehl, {H. T.} and Dietrich, {J. P.} and P. Doel and Eifler, {T. F.} and J. Estrada and {Fausti Neto}, A. and B. Flaugher and P. Fosalba and Gerdes, {D. W.} and D. Gruen and G. Gutierrez and K. Honscheid and James, {D. J.} and K. Kuehn and O. Lahav and M. Lima and Maia, {M. A.G.} and M. March and Marshall, {J. L.} and P. Martini and P. Melchior and Miller, {C. J.} and R. Miquel and Nichol, {R. C.} and R. Ogando and Plazas, {A. A.} and K. Reil and Romer, {A. K.} and A. Roodman and M. Sako and E. Sanchez and B. Santiago and V. Scarpine and M. Schubnell and I. Sevilla-Noarbe and Smith, {R. C.} and M. Soares-Santos and F. Sobreira and E. Suchyta and Swanson, {M. E.C.} and G. Tarle and J. Thaler and D. Tucker and Walker, {A. R.} and Wechsler, {R. H.} and Y. Zhang",

note = "Publisher Copyright: {\textcopyright} 2015 The Authors.",

year = "2015",

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, Carnero Rosell, A, Carrasco Kind, M, Carretero, J, Cunha, CE, D'Andrea, CB, da Costa, LN, Desai, S, Diehl, HT, Dietrich, JP, Doel, P, Eifler, TF, Estrada, J, Fausti Neto, A, 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, AK, Roodman, A, Sako, M, Sanchez, E, Santiago, B, Scarpine, V, Schubnell, M, Sevilla-Noarbe, I, Smith, RC, 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, A.

AU - Treu, T.

AU - Ostrovski, F.

AU - Schechter, P. L.

AU - Buckley-Geer, E. J.

AU - Lin, H.

AU - Auger, M. W.

AU - Courbin, F.

AU - Fassnacht, C. D.

AU - Frieman, J.

AU - Kuropatkin, N.

AU - Marshall, P. J.

AU - McMahon, R. G.

AU - Meylan, G.

AU - More, A.

AU - Suyu, S. H.

AU - Rusu, C. E.

AU - Finley, D.

AU - Abbott, T.

AU - Abdalla, F. B.

AU - Allam, S.

AU - Annis, J.

AU - Banerji, M.

AU - Benoit-Lévy, A.

AU - Bertin, E.

AU - Brooks, D.

AU - Burke, D. L.

AU - Carnero Rosell, A.

AU - Carrasco Kind, M.

AU - Carretero, J.

AU - Cunha, C. E.

AU - D'Andrea, C. B.

AU - da Costa, L. N.

AU - Desai, S.

AU - Diehl, H. T.

AU - Dietrich, J. P.

AU - Doel, P.

AU - Eifler, T. F.

AU - Estrada, J.

AU - Fausti Neto, A.

AU - Flaugher, B.

AU - Fosalba, P.

AU - Gerdes, D. W.

AU - Gruen, D.

AU - Gutierrez, G.

AU - Honscheid, K.

AU - James, D. J.

AU - Kuehn, K.

AU - Lahav, O.

AU - Lima, M.

AU - Maia, M. A.G.

AU - March, M.

AU - Marshall, J. L.

AU - Martini, P.

AU - Melchior, P.

AU - Miller, C. J.

AU - Miquel, R.

AU - Nichol, R. C.

AU - Ogando, R.

AU - Plazas, A. A.

AU - Reil, K.

AU - Romer, A. K.

AU - Roodman, A.

AU - Sako, M.

AU - Sanchez, E.

AU - Santiago, B.

AU - Scarpine, V.

AU - Schubnell, M.

AU - Sevilla-Noarbe, I.

AU - Smith, R. C.

AU - Soares-Santos, M.

AU - Sobreira, F.

AU - Suchyta, E.

AU - Swanson, M. E.C.

AU - Tarle, G.

AU - Thaler, J.

AU - Tucker, D.

AU - Walker, A. R.

AU - Wechsler, R. H.

AU - Zhang, Y.

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - Quasars: emission lines

KW - gravitational lensing: strong -methods: observational -methods: statistical

UR - http://www.scopus.com/inward/record.url?scp=85040225580&partnerID=8YFLogxK

U2 - 10.1093/mnras/stv2171

DO - 10.1093/mnras/stv2171

M3 - Article

AN - SCOPUS:85040225580

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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