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DES meets Gaia: Discovery of strongly lensed quasars from a multiplet search

DES meets Gaia: Discovery of strongly lensed quasars from a multiplet search
DES meets Gaia: Discovery of strongly lensed quasars from a multiplet search

We report the discovery, spectroscopic confirmation, and first lens models of the first, strongly lensed quasars from a combined search in WISE and Gaia-DR1 over the DES footprint. Their Einstein radii span a range between ≈2.0 arcsec and ≈0.4 arcsec. Two of these (WGD2038-4008, RA = 20:38:02.65, Dec.=-40:08:14.64; WGD2021-4115, RA = 20:21:39.45, Dec. = -41:15:57.11) also have confirmed deflector redshifts. The four-image lens WGD2038-4008, with source and deflector redshifts s = 0.777 ± 0.001 and zl = 0.230 ± 0.002, respectively, has a deflector with radius Reff ≈ 3.4 arcsec, stellar mass log(M*/M⊙) = 11.64+0.20 -0.43, and extended isophotal shape variation. Simple lens models yield Einstein radii RE = (1.30 ± 0.04) arcsec, axis ratio q = 0.75 ± 0.1 (compatible with that of the starlight) and considerable shear-ellipticity degeneracies. The two-image lens WGD2021-4115 has zs = 1.390 ± 0.001 and zl = 0.335 ± 0.002, and Einstein radius RE = (1.1 ± 0.1) arcsec, but higher-resolution imaging is needed to accurately separate the deflector and faint quasar image. Analogous lens model degeneracies hold for the other six lenses (J0146-1133, J0150-4041, J0235-2433, J0245-0556, J0259-2338, and J0508-2748) shown in this paper.

Gravitational lensing: strong, Methods: statistical, Surveys, Techniques: image processing
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Agnello, A., Lin, H., Kuropatkin, N., Buckley-Geer, E., Anguita, T., Schechter, P.L., Morishita, T., Motta, V., Rojas, K., Treu, T., Amara, A., Auger, M.W., Courbin, F., Fassnacht, C.D., Frieman, J., More, A., Marshall, P.J., McMahon, R.G., Meylan, G., Suyu, S.H., Glazebrook, K., Morgan, N., Nord, B., Abbott, T.M.C., Abdalla, F.B., Annis, J., Bechtol, K., Benoit-Lévy, K., Bertin, E., Bernstein, R.A., Brooks, D., Burke, D.L., Carnero Rosell, A., Carretero, J., Cunha, C.E., D'Andrea, C.B., da Costa, L.N., Desai, S., Drlica-Wagner, A., Eifler, T.F., Flaugher, B., García-Bellido, J., Gaztanaga, E., Gerdes, D.W., Gruen, D., Gruendl, R.A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D.J., Kuehn, K., Lahav, O., Lima, M., Maia, M.A.G., March, M., Menanteau, F., Miquel, R., Ogando, R.L.C., Plazas, A.A., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M.E.C., Tarle, G., Tucker, D. and Wechsler, R. (2018) DES meets Gaia: Discovery of strongly lensed quasars from a multiplet search. Monthly Notices of the Royal Astronomical Society, 479 (4), 4345-4354. (doi:10.1093/mnras/sty1419).

Record type: Article

Abstract

We report the discovery, spectroscopic confirmation, and first lens models of the first, strongly lensed quasars from a combined search in WISE and Gaia-DR1 over the DES footprint. Their Einstein radii span a range between ≈2.0 arcsec and ≈0.4 arcsec. Two of these (WGD2038-4008, RA = 20:38:02.65, Dec.=-40:08:14.64; WGD2021-4115, RA = 20:21:39.45, Dec. = -41:15:57.11) also have confirmed deflector redshifts. The four-image lens WGD2038-4008, with source and deflector redshifts s = 0.777 ± 0.001 and zl = 0.230 ± 0.002, respectively, has a deflector with radius Reff ≈ 3.4 arcsec, stellar mass log(M*/M⊙) = 11.64+0.20 -0.43, and extended isophotal shape variation. Simple lens models yield Einstein radii RE = (1.30 ± 0.04) arcsec, axis ratio q = 0.75 ± 0.1 (compatible with that of the starlight) and considerable shear-ellipticity degeneracies. The two-image lens WGD2021-4115 has zs = 1.390 ± 0.001 and zl = 0.335 ± 0.002, and Einstein radius RE = (1.1 ± 0.1) arcsec, but higher-resolution imaging is needed to accurately separate the deflector and faint quasar image. Analogous lens model degeneracies hold for the other six lenses (J0146-1133, J0150-4041, J0235-2433, J0245-0556, J0259-2338, and J0508-2748) shown in this paper.

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More information

Accepted/In Press date: 21 May 2018
e-pub ahead of print date: 4 June 2018
Published date: 1 October 2018
Keywords: Gravitational lensing: strong, Methods: statistical, Surveys, Techniques: image processing
Learn more about Physics & Astronomy research

Identifiers

Local EPrints ID: 423350
URI: http://eprints.soton.ac.uk/id/eprint/423350
DOI: doi:10.1093/mnras/sty1419
ISSN: 1365-2966
PURE UUID: 27d73ae6-1a70-4f48-a11c-2d8a7db78d8f
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 20 Sep 2018 16:30
Last modified: 16 Apr 2024 01:46

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Contributors

Author: A. Agnello
Author: H. Lin
Author: N. Kuropatkin
Author: E. Buckley-Geer
Author: T. Anguita
Author: P.L. Schechter
Author: T. Morishita
Author: V. Motta
Author: K. Rojas
Author: T. Treu
Author: A. Amara
Author: M.W. Auger
Author: F. Courbin
Author: C.D. Fassnacht
Author: J. Frieman
Author: A. More
Author: P.J. Marshall
Author: R.G. McMahon
Author: G. Meylan
Author: S.H. Suyu
Author: K. Glazebrook
Author: N. Morgan
Author: B. Nord
Author: T.M.C. Abbott
Author: F.B. Abdalla
Author: J. Annis
Author: K. Bechtol
Author: K. Benoit-Lévy
Author: E. Bertin
Author: R.A. Bernstein
Author: D. Brooks
Author: D.L. Burke
Author: A. Carnero Rosell
Author: J. Carretero
Author: C.E. Cunha
Author: C.B. D'Andrea
Author: L.N. da Costa
Author: S. Desai
Author: A. Drlica-Wagner
Author: T.F. Eifler
Author: B. Flaugher
Author: J. García-Bellido
Author: E. Gaztanaga
Author: D.W. Gerdes
Author: D. Gruen
Author: R.A. Gruendl
Author: J. Gschwend
Author: G. Gutierrez
Author: K. Honscheid
Author: D.J. James
Author: K. Kuehn
Author: O. Lahav
Author: M. Lima
Author: M.A.G. Maia
Author: M. March
Author: F. Menanteau
Author: R. Miquel
Author: R.L.C. Ogando
Author: A.A. Plazas
Author: E. Sanchez
Author: V. Scarpine
Author: R. Schindler
Author: M. Schubnell
Author: I. Sevilla-Noarbe
Author: M. Smith ORCID iD
Author: M. Soares-Santos
Author: F. Sobreira
Author: E. Suchyta
Author: M.E.C. Swanson
Author: G. Tarle
Author: D. Tucker
Author: R. Wechsler

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