The STRong lensing Insights into the Dark Energy Survey (STRIDES) 2017/2018 follow-up campaign: discovery of 10 lensed quasars and 10 quasar pairs
ABSTRACT 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 Ima...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2020
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Online Access: | http://dx.doi.org/10.1093/mnras/staa652 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa652/32867448/staa652.pdf http://academic.oup.com/mnras/article-pdf/494/3/3491/33145011/staa652.pdf |
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croxfordunivpr:10.1093/mnras/staa652 2024-04-07T07:55:44+00:00 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 W McMahon, R Anguita, T Apostolovski, Y Chen, G C-F Fassnacht, C D Melo, A D Motta, V Shajib, A Treu, T Agnello, A Buckley-Geer, E Schechter, P L Birrer, S Collett, T Courbin, F Rusu, C E Abbott, T M C Allam, S Annis, J Avila, S Bertin, E Brooks, D Burke, D L Carnero Rosell, A Carrasco Kind, M Carretero, J Costanzi, M da Costa, L N De Vicente, J Desai, S Eifler, T F Flaugher, B Frieman, J García-Bellido, J Gaztanaga, E Gerdes, D W Gruen, D Gruendl, R A Gschwend, J Gutierrez, G Honscheid, K James, D J Kim, A Krause, E Kuehn, K Kuropatkin, N Lahav, O Lima, M National Science Foundation MINECO ERDF Generalitat de Catalunya European Research Council Seventh Framework Programme CNPq Swiss National Science Foundation Horizon 2020 Villum Fonden DFF FONDECYT National Aeronautics and Space Administration CONICYT 2020 http://dx.doi.org/10.1093/mnras/staa652 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa652/32867448/staa652.pdf http://academic.oup.com/mnras/article-pdf/494/3/3491/33145011/staa652.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Monthly Notices of the Royal Astronomical Society volume 494, issue 3, page 3491-3511 ISSN 0035-8711 1365-2966 Space and Planetary Science Astronomy and Astrophysics journal-article 2020 croxfordunivpr https://doi.org/10.1093/mnras/staa652 2024-03-08T03:08:46Z ABSTRACT 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 on Keck, confirming 10 new lensed 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 same magnitude, 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. Article in Journal/Newspaper sami Oxford University Press Monthly Notices of the Royal Astronomical Society 494 3 3491 3511 |
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Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Space and Planetary Science Astronomy and Astrophysics |
spellingShingle |
Space and Planetary Science Astronomy and Astrophysics Lemon, C Auger, M W McMahon, R Anguita, T Apostolovski, Y Chen, G C-F Fassnacht, C D Melo, A D Motta, V Shajib, A Treu, T Agnello, A Buckley-Geer, E Schechter, P L Birrer, S Collett, T Courbin, F Rusu, C E Abbott, T M C Allam, S Annis, J Avila, S Bertin, E Brooks, D Burke, D L Carnero Rosell, A Carrasco Kind, M Carretero, J Costanzi, M da Costa, L N De Vicente, J Desai, S Eifler, T F Flaugher, B Frieman, J García-Bellido, J Gaztanaga, E Gerdes, D W Gruen, D Gruendl, R A Gschwend, J Gutierrez, G Honscheid, K James, D J 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 |
Space and Planetary Science Astronomy and Astrophysics |
description |
ABSTRACT 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 on Keck, confirming 10 new lensed 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 same magnitude, 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. |
author2 |
National Science Foundation MINECO ERDF Generalitat de Catalunya European Research Council Seventh Framework Programme CNPq Swiss National Science Foundation Horizon 2020 Villum Fonden DFF FONDECYT National Aeronautics and Space Administration CONICYT |
format |
Article in Journal/Newspaper |
author |
Lemon, C Auger, M W McMahon, R Anguita, T Apostolovski, Y Chen, G C-F Fassnacht, C D Melo, A D Motta, V Shajib, A Treu, T Agnello, A Buckley-Geer, E Schechter, P L Birrer, S Collett, T Courbin, F Rusu, C E Abbott, T M C Allam, S Annis, J Avila, S Bertin, E Brooks, D Burke, D L Carnero Rosell, A Carrasco Kind, M Carretero, J Costanzi, M da Costa, L N De Vicente, J Desai, S Eifler, T F Flaugher, B Frieman, J García-Bellido, J Gaztanaga, E Gerdes, D W Gruen, D Gruendl, R A Gschwend, J Gutierrez, G Honscheid, K James, D J Kim, A Krause, E Kuehn, K Kuropatkin, N Lahav, O Lima, M |
author_facet |
Lemon, C Auger, M W McMahon, R Anguita, T Apostolovski, Y Chen, G C-F Fassnacht, C D Melo, A D Motta, V Shajib, A Treu, T Agnello, A Buckley-Geer, E Schechter, P L Birrer, S Collett, T Courbin, F Rusu, C E Abbott, T M C Allam, S Annis, J Avila, S Bertin, E Brooks, D Burke, D L Carnero Rosell, A Carrasco Kind, M Carretero, J Costanzi, M da Costa, L N De Vicente, J Desai, S Eifler, T F Flaugher, B Frieman, J García-Bellido, J Gaztanaga, E Gerdes, D W Gruen, D Gruendl, R A Gschwend, J Gutierrez, G Honscheid, K James, D J 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 (OUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1093/mnras/staa652 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa652/32867448/staa652.pdf http://academic.oup.com/mnras/article-pdf/494/3/3491/33145011/staa652.pdf |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society volume 494, issue 3, page 3491-3511 ISSN 0035-8711 1365-2966 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
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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3491 |
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3511 |
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