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VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning

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VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning. / Ostrovski, Fernanda; McMahon, Richard G.; Connolly, Andrew J.; Lemon, Cameron A.; Auger, Matthew W.; Banerji, Manda; Hung, Johnathan M.; Koposov, Sergey E.; Lidman, Christopher E.; Reed, Sophie L.; Allam, Sahar; Benoit-Lévy, Aurélien; Bertin, Emmanuel; Brooks, David; Buckley-Geer, Elizabeth; Rosell, Aurelio Carnero; Kind, Matias Carrasco; Carretero, Jorge; Cunha, Carlos E.; Costa, Luiz N. da; Desai, Shantanu; Diehl, H. Thomas; Dietrich, Jörg P.; Evrard, August E.; Finley, David A.; Flaugher, Brenna; Fosalba, Pablo; Frieman, Josh; Gerdes, David W.; Goldstein, Daniel A.; Gruen, Daniel; Gruendl, Robert A.; Gutierrez, Gaston; Honscheid, Klaus; James, David J.; Kuehn, Kyler; Kuropatkin, Nikolay; Lima, Marcos; Lin, Huan; Maia, Marcio A. G.; Marshall, Jennifer L.; Martini, Paul; Melchior, Peter; Miquel, Ramon; Ogando, Ricardo; Malagón, Andrés Plazas; Reil, Kevin; Romer, Kathy; Sanchez, Eusebio; Santiago, Basilio; Scarpine, Vic; Sevilla-Noarbe, Ignacio; Soares-Santos, Marcelle; Sobreira, Flavia; Suchyta, Eric; Tarle, Gregory; Thomas, Daniel; Tucker, Douglas L.; Walker, Alistair R.

In: Monthly Notices of the Royal Astronomical Society, Vol. 465, No. 4, 17.11.2016, p. 4325-4334.

Research output: Contribution to journalArticlepeer-review

Harvard

Ostrovski, F, McMahon, RG, Connolly, AJ, Lemon, CA, Auger, MW, Banerji, M, Hung, JM, Koposov, SE, Lidman, CE, Reed, SL, Allam, S, Benoit-Lévy, A, Bertin, E, Brooks, D, Buckley-Geer, E, Rosell, AC, Kind, MC, Carretero, J, Cunha, CE, Costa, LND, Desai, S, Diehl, HT, Dietrich, JP, Evrard, AE, Finley, DA, Flaugher, B, Fosalba, P, Frieman, J, Gerdes, DW, Goldstein, DA, Gruen, D, Gruendl, RA, Gutierrez, G, Honscheid, K, James, DJ, Kuehn, K, Kuropatkin, N, Lima, M, Lin, H, Maia, MAG, Marshall, JL, Martini, P, Melchior, P, Miquel, R, Ogando, R, Malagón, AP, Reil, K, Romer, K, Sanchez, E, Santiago, B, Scarpine, V, Sevilla-Noarbe, I, Soares-Santos, M, Sobreira, F, Suchyta, E, Tarle, G, Thomas, D, Tucker, DL & Walker, AR 2016, 'VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning', Monthly Notices of the Royal Astronomical Society, vol. 465, no. 4, pp. 4325-4334. https://doi.org/10.1093/mnras/stw2958

APA

Ostrovski, F., McMahon, R. G., Connolly, A. J., Lemon, C. A., Auger, M. W., Banerji, M., Hung, J. M., Koposov, S. E., Lidman, C. E., Reed, S. L., Allam, S., Benoit-Lévy, A., Bertin, E., Brooks, D., Buckley-Geer, E., Rosell, A. C., Kind, M. C., Carretero, J., Cunha, C. E., ... Walker, A. R. (2016). VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning. Monthly Notices of the Royal Astronomical Society, 465(4), 4325-4334. https://doi.org/10.1093/mnras/stw2958

Vancouver

Ostrovski F, McMahon RG, Connolly AJ, Lemon CA, Auger MW, Banerji M et al. VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning. Monthly Notices of the Royal Astronomical Society. 2016 Nov 17;465(4):4325-4334. https://doi.org/10.1093/mnras/stw2958

Author

Ostrovski, Fernanda ; McMahon, Richard G. ; Connolly, Andrew J. ; Lemon, Cameron A. ; Auger, Matthew W. ; Banerji, Manda ; Hung, Johnathan M. ; Koposov, Sergey E. ; Lidman, Christopher E. ; Reed, Sophie L. ; Allam, Sahar ; Benoit-Lévy, Aurélien ; Bertin, Emmanuel ; Brooks, David ; Buckley-Geer, Elizabeth ; Rosell, Aurelio Carnero ; Kind, Matias Carrasco ; Carretero, Jorge ; Cunha, Carlos E. ; Costa, Luiz N. da ; Desai, Shantanu ; Diehl, H. Thomas ; Dietrich, Jörg P. ; Evrard, August E. ; Finley, David A. ; Flaugher, Brenna ; Fosalba, Pablo ; Frieman, Josh ; Gerdes, David W. ; Goldstein, Daniel A. ; Gruen, Daniel ; Gruendl, Robert A. ; Gutierrez, Gaston ; Honscheid, Klaus ; James, David J. ; Kuehn, Kyler ; Kuropatkin, Nikolay ; Lima, Marcos ; Lin, Huan ; Maia, Marcio A. G. ; Marshall, Jennifer L. ; Martini, Paul ; Melchior, Peter ; Miquel, Ramon ; Ogando, Ricardo ; Malagón, Andrés Plazas ; Reil, Kevin ; Romer, Kathy ; Sanchez, Eusebio ; Santiago, Basilio ; Scarpine, Vic ; Sevilla-Noarbe, Ignacio ; Soares-Santos, Marcelle ; Sobreira, Flavia ; Suchyta, Eric ; Tarle, Gregory ; Thomas, Daniel ; Tucker, Douglas L. ; Walker, Alistair R. / VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 465, No. 4. pp. 4325-4334.

Bibtex

@article{45282564acf340fdb1f099d277091a11,
title = "VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning",
abstract = "We present the discovery and preliminary characterization of a gravitationally lensed quasar with a source redshift zs = 2.74 and image separation of 2.9{"} lensed by a foreground zl = 0.40 elliptical galaxy. Since the images of gravitationally lensed quasars are the superposition of multiple point sources and a foreground lensing galaxy, we have developed a morphology independent multi-wavelength approach to the photometric selection of lensed quasar candidates based on Gaussian Mixture Models (GMM) supervised machine learning. Using this technique and gi multicolour photometric observations from the Dark Energy Survey (DES), near IR $JK$ photometry from the VISTA Hemisphere Survey (VHS) and WISE mid IR photometry, we have identified a candidate system with two catalogue components with iAB = 18.61 and iAB = 20.44 comprised of an elliptical galaxy and two blue point sources. Spectroscopic follow-up with NTT and the use of an archival AAT spectrum show that the point sources can be identified as a lensed quasar with an emission line redshift of z = 2.739 ± 0.003 and a foreground early type galaxy with z = 0.400 ± 0.002. We model the system as a single isothermal ellipsoid and find the Einstein radius θE  ∼ 1.47{"}, enclosed mass Menc  ∼ 4 x 1011MΘ and a time delay of ∼52 days. The relatively wide separation, month scale time delay duration and high redshift make this an ideal system for constraining the expansion rate beyond a redshift of 1.",
keywords = "astro-ph.GA, RCUK, STFC",
author = "Fernanda Ostrovski and McMahon, {Richard G.} and Connolly, {Andrew J.} and Lemon, {Cameron A.} and Auger, {Matthew W.} and Manda Banerji and Hung, {Johnathan M.} and Koposov, {Sergey E.} and Lidman, {Christopher E.} and Reed, {Sophie L.} and Sahar Allam and Aur{\'e}lien Benoit-L{\'e}vy and Emmanuel Bertin and David Brooks and Elizabeth Buckley-Geer and Rosell, {Aurelio Carnero} and Kind, {Matias Carrasco} and Jorge Carretero and Cunha, {Carlos E.} and Costa, {Luiz N. da} and Shantanu Desai and Diehl, {H. Thomas} and Dietrich, {J{\"o}rg P.} and Evrard, {August E.} and Finley, {David A.} and Brenna Flaugher and Pablo Fosalba and Josh Frieman and Gerdes, {David W.} and Goldstein, {Daniel A.} and Daniel Gruen and Gruendl, {Robert A.} and Gaston Gutierrez and Klaus Honscheid and James, {David J.} and Kyler Kuehn and Nikolay Kuropatkin and Marcos Lima and Huan Lin and Maia, {Marcio A. G.} and Marshall, {Jennifer L.} and Paul Martini and Peter Melchior and Ramon Miquel and Ricardo Ogando and Malag{\'o}n, {Andr{\'e}s Plazas} and Kevin Reil and Kathy Romer and Eusebio Sanchez and Basilio Santiago and Vic Scarpine and Ignacio Sevilla-Noarbe and Marcelle Soares-Santos and Flavia Sobreira and Eric Suchyta and Gregory Tarle and Daniel Thomas and Tucker, {Douglas L.} and Walker, {Alistair R.}",
note = "11 pages, 7 figures, 7 tables, MNRAS accepted",
year = "2016",
month = nov,
day = "17",
doi = "10.1093/mnras/stw2958",
language = "English",
volume = "465",
pages = "4325--4334",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

RIS

TY - JOUR

T1 - VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning

AU - Ostrovski, Fernanda

AU - McMahon, Richard G.

AU - Connolly, Andrew J.

AU - Lemon, Cameron A.

AU - Auger, Matthew W.

AU - Banerji, Manda

AU - Hung, Johnathan M.

AU - Koposov, Sergey E.

AU - Lidman, Christopher E.

AU - Reed, Sophie L.

AU - Allam, Sahar

AU - Benoit-Lévy, Aurélien

AU - Bertin, Emmanuel

AU - Brooks, David

AU - Buckley-Geer, Elizabeth

AU - Rosell, Aurelio Carnero

AU - Kind, Matias Carrasco

AU - Carretero, Jorge

AU - Cunha, Carlos E.

AU - Costa, Luiz N. da

AU - Desai, Shantanu

AU - Diehl, H. Thomas

AU - Dietrich, Jörg P.

AU - Evrard, August E.

AU - Finley, David A.

AU - Flaugher, Brenna

AU - Fosalba, Pablo

AU - Frieman, Josh

AU - Gerdes, David W.

AU - Goldstein, Daniel A.

AU - Gruen, Daniel

AU - Gruendl, Robert A.

AU - Gutierrez, Gaston

AU - Honscheid, Klaus

AU - James, David J.

AU - Kuehn, Kyler

AU - Kuropatkin, Nikolay

AU - Lima, Marcos

AU - Lin, Huan

AU - Maia, Marcio A. G.

AU - Marshall, Jennifer L.

AU - Martini, Paul

AU - Melchior, Peter

AU - Miquel, Ramon

AU - Ogando, Ricardo

AU - Malagón, Andrés Plazas

AU - Reil, Kevin

AU - Romer, Kathy

AU - Sanchez, Eusebio

AU - Santiago, Basilio

AU - Scarpine, Vic

AU - Sevilla-Noarbe, Ignacio

AU - Soares-Santos, Marcelle

AU - Sobreira, Flavia

AU - Suchyta, Eric

AU - Tarle, Gregory

AU - Thomas, Daniel

AU - Tucker, Douglas L.

AU - Walker, Alistair R.

N1 - 11 pages, 7 figures, 7 tables, MNRAS accepted

PY - 2016/11/17

Y1 - 2016/11/17

N2 - We present the discovery and preliminary characterization of a gravitationally lensed quasar with a source redshift zs = 2.74 and image separation of 2.9" lensed by a foreground zl = 0.40 elliptical galaxy. Since the images of gravitationally lensed quasars are the superposition of multiple point sources and a foreground lensing galaxy, we have developed a morphology independent multi-wavelength approach to the photometric selection of lensed quasar candidates based on Gaussian Mixture Models (GMM) supervised machine learning. Using this technique and gi multicolour photometric observations from the Dark Energy Survey (DES), near IR $JK$ photometry from the VISTA Hemisphere Survey (VHS) and WISE mid IR photometry, we have identified a candidate system with two catalogue components with iAB = 18.61 and iAB = 20.44 comprised of an elliptical galaxy and two blue point sources. Spectroscopic follow-up with NTT and the use of an archival AAT spectrum show that the point sources can be identified as a lensed quasar with an emission line redshift of z = 2.739 ± 0.003 and a foreground early type galaxy with z = 0.400 ± 0.002. We model the system as a single isothermal ellipsoid and find the Einstein radius θE  ∼ 1.47", enclosed mass Menc  ∼ 4 x 1011MΘ and a time delay of ∼52 days. The relatively wide separation, month scale time delay duration and high redshift make this an ideal system for constraining the expansion rate beyond a redshift of 1.

AB - We present the discovery and preliminary characterization of a gravitationally lensed quasar with a source redshift zs = 2.74 and image separation of 2.9" lensed by a foreground zl = 0.40 elliptical galaxy. Since the images of gravitationally lensed quasars are the superposition of multiple point sources and a foreground lensing galaxy, we have developed a morphology independent multi-wavelength approach to the photometric selection of lensed quasar candidates based on Gaussian Mixture Models (GMM) supervised machine learning. Using this technique and gi multicolour photometric observations from the Dark Energy Survey (DES), near IR $JK$ photometry from the VISTA Hemisphere Survey (VHS) and WISE mid IR photometry, we have identified a candidate system with two catalogue components with iAB = 18.61 and iAB = 20.44 comprised of an elliptical galaxy and two blue point sources. Spectroscopic follow-up with NTT and the use of an archival AAT spectrum show that the point sources can be identified as a lensed quasar with an emission line redshift of z = 2.739 ± 0.003 and a foreground early type galaxy with z = 0.400 ± 0.002. We model the system as a single isothermal ellipsoid and find the Einstein radius θE  ∼ 1.47", enclosed mass Menc  ∼ 4 x 1011MΘ and a time delay of ∼52 days. The relatively wide separation, month scale time delay duration and high redshift make this an ideal system for constraining the expansion rate beyond a redshift of 1.

KW - astro-ph.GA

KW - RCUK

KW - STFC

U2 - 10.1093/mnras/stw2958

DO - 10.1093/mnras/stw2958

M3 - Article

VL - 465

SP - 4325

EP - 4334

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 4

ER -

ID: 5516906