The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs
Indexación: Scopus. We report the results of the STRong lensing Insights into the Dark Energy Survey (STRIDES) follow-up campaign of the late 2017/early 2018 season. We obtained spectra of 65 lensed quasar candidates with ESO Faint Object Spectrograph and Camera 2 on the NTT and Echellette Spectrogr...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press
2020
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Online Access: | http://repositorio.unab.cl/xmlui/handle/ria/19924 https://doi.org/10.1093/MNRAS/STAA652 |
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ftunivabello:oai:repositorio.unab.cl:ria/19924 2023-05-15T18:13:14+02:00 The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs Lemon, C. Auger, M. Anguita, T. McMahon, R. Apostolovski, Y. Chen, G. Fassnacht, C. Melo, A. Motta, V. Shajib, A. Treu, T. Agnello, A. Buckley-Geer, E Schechter, P. Birrer, S. Collett, T. Courbin, F. Rusu, C. Abbott, T. Allam, S. Annis, J. Avila, S. Bertin, E. Brooks, D. Burke, D. Carnero Rosell, A. Carrasco Kind, M. Carretero, J. Costanzi, M. Costa, L. De Vicente, J. Desai, S. Eifler, T. Flaugher, B. Frieman, J. Garcia-Bellido, J. Gaztanaga, E. Gerdes, D. Gruen, D. Gruendl, R. Gschwend, J. Gutierrez, G. Honscheid, K. James, D. Kim, A. Krause, E. Kuehn, K. Kuropatkin, N. Lahav, O. Lima, M. 2020 application/pdf http://repositorio.unab.cl/xmlui/handle/ria/19924 https://doi.org/10.1093/MNRAS/STAA652 en eng Oxford University Press Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 3, Pages 3491 - 3511, 2020 0035-8711 http://repositorio.unab.cl/xmlui/handle/ria/19924 doi:10.1093/MNRAS/STAA652 Gravitational lensing: strong Methods: observational Quasars: general Gravitational Lenses Quasars Galaxies Article 2020 ftunivabello https://doi.org/10.1093/MNRAS/STAA652 2022-12-27T17:04:00Z Indexación: Scopus. We report the results of the STRong lensing Insights into the Dark Energy Survey (STRIDES) follow-up campaign of the late 2017/early 2018 season. We obtained spectra of 65 lensed quasar candidates with ESO Faint Object Spectrograph and Camera 2 on the NTT and Echellette Spectrograph and Imager onKeck, confirming 10 newlensed quasars and 10 quasar pairs. Eight lensed quasars are doubly imaged with source redshifts between 0.99 and 2.90, one is triply imaged (DESJ0345.2545, z = 1.68), and one is quadruply imaged (quad: DESJ0053.2012, z = 3.8). Singular isothermal ellipsoid models for the doubles, based on high-resolution imaging from SAMI on Southern Astrophysical Research Telescope or Near InfraRed Camera 2 on Keck, give total magnifications between 3.2 and 5.6, and Einstein radii between 0.49 and 1.97 arcsec. After spectroscopic follow-up, we extract multi-epoch grizY photometry of confirmed lensed quasars and contaminant quasar+star pairs from DES data using parametric multiband modelling, and compare variability in each system's components. By measuring the reduced χ2 associated with fitting all epochs to the samemagnitude, we find a simple cut on the less variable component that retains all confirmed lensed quasars, while removing 94 per cent of contaminant systems. Based on our spectroscopic follow-up, this variability information improves selection of lensed quasars and quasar pairs from 34-45 per cent to 51-70 per cent, with most remaining contaminants being star-forming galaxies. Using mock lensed quasar light curves we demonstrate that selection based only on variability will over-represent the quad fraction by 10 per cent over a complete DES magnitude-limited sample, explained by the magnification bias and hence lower luminosity/more variable sources in quads. https://academic.oup.com/mnras/article/494/3/3491/5801039 Article in Journal/Newspaper sami Universidad Andrés Bello: Repositorio Institucional Académico Monthly Notices of the Royal Astronomical Society 494 3 3491 3511 |
institution |
Open Polar |
collection |
Universidad Andrés Bello: Repositorio Institucional Académico |
op_collection_id |
ftunivabello |
language |
English |
topic |
Gravitational lensing: strong Methods: observational Quasars: general Gravitational Lenses Quasars Galaxies |
spellingShingle |
Gravitational lensing: strong Methods: observational Quasars: general Gravitational Lenses Quasars Galaxies Lemon, C. Auger, M. Anguita, T. McMahon, R. Apostolovski, Y. Chen, G. Fassnacht, C. Melo, A. Motta, V. Shajib, A. Treu, T. Agnello, A. Buckley-Geer, E Schechter, P. Birrer, S. Collett, T. Courbin, F. Rusu, C. Abbott, T. Allam, S. Annis, J. Avila, S. Bertin, E. Brooks, D. Burke, D. Carnero Rosell, A. Carrasco Kind, M. Carretero, J. Costanzi, M. Costa, L. De Vicente, J. Desai, S. Eifler, T. Flaugher, B. Frieman, J. Garcia-Bellido, J. Gaztanaga, E. Gerdes, D. Gruen, D. Gruendl, R. Gschwend, J. Gutierrez, G. Honscheid, K. James, D. Kim, A. Krause, E. Kuehn, K. Kuropatkin, N. Lahav, O. Lima, M. The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs |
topic_facet |
Gravitational lensing: strong Methods: observational Quasars: general Gravitational Lenses Quasars Galaxies |
description |
Indexación: Scopus. We report the results of the STRong lensing Insights into the Dark Energy Survey (STRIDES) follow-up campaign of the late 2017/early 2018 season. We obtained spectra of 65 lensed quasar candidates with ESO Faint Object Spectrograph and Camera 2 on the NTT and Echellette Spectrograph and Imager onKeck, confirming 10 newlensed quasars and 10 quasar pairs. Eight lensed quasars are doubly imaged with source redshifts between 0.99 and 2.90, one is triply imaged (DESJ0345.2545, z = 1.68), and one is quadruply imaged (quad: DESJ0053.2012, z = 3.8). Singular isothermal ellipsoid models for the doubles, based on high-resolution imaging from SAMI on Southern Astrophysical Research Telescope or Near InfraRed Camera 2 on Keck, give total magnifications between 3.2 and 5.6, and Einstein radii between 0.49 and 1.97 arcsec. After spectroscopic follow-up, we extract multi-epoch grizY photometry of confirmed lensed quasars and contaminant quasar+star pairs from DES data using parametric multiband modelling, and compare variability in each system's components. By measuring the reduced χ2 associated with fitting all epochs to the samemagnitude, we find a simple cut on the less variable component that retains all confirmed lensed quasars, while removing 94 per cent of contaminant systems. Based on our spectroscopic follow-up, this variability information improves selection of lensed quasars and quasar pairs from 34-45 per cent to 51-70 per cent, with most remaining contaminants being star-forming galaxies. Using mock lensed quasar light curves we demonstrate that selection based only on variability will over-represent the quad fraction by 10 per cent over a complete DES magnitude-limited sample, explained by the magnification bias and hence lower luminosity/more variable sources in quads. https://academic.oup.com/mnras/article/494/3/3491/5801039 |
format |
Article in Journal/Newspaper |
author |
Lemon, C. Auger, M. Anguita, T. McMahon, R. Apostolovski, Y. Chen, G. Fassnacht, C. Melo, A. Motta, V. Shajib, A. Treu, T. Agnello, A. Buckley-Geer, E Schechter, P. Birrer, S. Collett, T. Courbin, F. Rusu, C. Abbott, T. Allam, S. Annis, J. Avila, S. Bertin, E. Brooks, D. Burke, D. Carnero Rosell, A. Carrasco Kind, M. Carretero, J. Costanzi, M. Costa, L. De Vicente, J. Desai, S. Eifler, T. Flaugher, B. Frieman, J. Garcia-Bellido, J. Gaztanaga, E. Gerdes, D. Gruen, D. Gruendl, R. Gschwend, J. Gutierrez, G. Honscheid, K. James, D. Kim, A. Krause, E. Kuehn, K. Kuropatkin, N. Lahav, O. Lima, M. |
author_facet |
Lemon, C. Auger, M. Anguita, T. McMahon, R. Apostolovski, Y. Chen, G. Fassnacht, C. Melo, A. Motta, V. Shajib, A. Treu, T. Agnello, A. Buckley-Geer, E Schechter, P. Birrer, S. Collett, T. Courbin, F. Rusu, C. Abbott, T. Allam, S. Annis, J. Avila, S. Bertin, E. Brooks, D. Burke, D. Carnero Rosell, A. Carrasco Kind, M. Carretero, J. Costanzi, M. Costa, L. De Vicente, J. Desai, S. Eifler, T. Flaugher, B. Frieman, J. Garcia-Bellido, J. Gaztanaga, E. Gerdes, D. Gruen, D. Gruendl, R. Gschwend, J. Gutierrez, G. Honscheid, K. James, D. Kim, A. Krause, E. Kuehn, K. Kuropatkin, N. Lahav, O. Lima, M. |
author_sort |
Lemon, C. |
title |
The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs |
title_short |
The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs |
title_full |
The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs |
title_fullStr |
The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs |
title_full_unstemmed |
The STRong lensing Insights into the dark energy survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs |
title_sort |
strong lensing insights into the dark energy survey (strides) 2017/2018 follow-up campaign: discovery of 10 lensed quasars and 10 quasar pairs |
publisher |
Oxford University Press |
publishDate |
2020 |
url |
http://repositorio.unab.cl/xmlui/handle/ria/19924 https://doi.org/10.1093/MNRAS/STAA652 |
genre |
sami |
genre_facet |
sami |
op_relation |
Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 3, Pages 3491 - 3511, 2020 0035-8711 http://repositorio.unab.cl/xmlui/handle/ria/19924 doi:10.1093/MNRAS/STAA652 |
op_doi |
https://doi.org/10.1093/MNRAS/STAA652 |
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Monthly Notices of the Royal Astronomical Society |
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494 |
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3 |
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