High-resolution imaging follow-up of doubly imaged quasars
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High-resolution imaging follow-up of doubly imaged quasars. / Shajib, Anowar J.; Molina, Eden; Agnello, Adriano; Williams, Peter R.; Birrer, Simon; Treu, Tommaso; Fassnacht, Christopher D.; Morishita, Takahiro; Abramson, Louis; Schechter, Paul L.; Wisotzki, Lutz.
In: Monthly Notices of the Royal Astronomical Society, Vol. 503, No. 2, 02.05.2021, p. 1557-1567.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - High-resolution imaging follow-up of doubly imaged quasars
AU - Shajib, Anowar J.
AU - Molina, Eden
AU - Agnello, Adriano
AU - Williams, Peter R.
AU - Birrer, Simon
AU - Treu, Tommaso
AU - Fassnacht, Christopher D.
AU - Morishita, Takahiro
AU - Abramson, Louis
AU - Schechter, Paul L.
AU - Wisotzki, Lutz
PY - 2021/5/2
Y1 - 2021/5/2
N2 - We report upon 3 years of follow-up and confirmation of doubly imaged quasar lenses through imaging campaigns from 2016 to 2018 with the Near-Infrared Camera2 (NIRC2) on the W. M. Keck Observatory. A sample of 57 quasar lens candidates are imaged in adaptive-optics-assisted or seeing-limited K'-band observations. Out of these 57 candidates, 15 are confirmed as lenses. We form a sample of 20 lenses adding in a number of previously known lenses that were imaged with NIRC2 in 2013-14 as part of a pilot study. By modelling these 20 lenses, we obtain K'-band relative photometry and astrometry of the quasar images and the lens galaxy. We also provide the lens properties and predicted time delays to aid planning of follow-up observations necessary for various astrophysical applications, e.g. spectroscopic follow-up to obtain the deflector redshifts for the newly confirmed systems. We compare the departure of the observed flux ratios from the smooth-model predictions between doubly and quadruply imaged quasar systems. We find that the departure is consistent between these two types of lenses if the modelling uncertainty is comparable.
AB - We report upon 3 years of follow-up and confirmation of doubly imaged quasar lenses through imaging campaigns from 2016 to 2018 with the Near-Infrared Camera2 (NIRC2) on the W. M. Keck Observatory. A sample of 57 quasar lens candidates are imaged in adaptive-optics-assisted or seeing-limited K'-band observations. Out of these 57 candidates, 15 are confirmed as lenses. We form a sample of 20 lenses adding in a number of previously known lenses that were imaged with NIRC2 in 2013-14 as part of a pilot study. By modelling these 20 lenses, we obtain K'-band relative photometry and astrometry of the quasar images and the lens galaxy. We also provide the lens properties and predicted time delays to aid planning of follow-up observations necessary for various astrophysical applications, e.g. spectroscopic follow-up to obtain the deflector redshifts for the newly confirmed systems. We compare the departure of the observed flux ratios from the smooth-model predictions between doubly and quadruply imaged quasar systems. We find that the departure is consistent between these two types of lenses if the modelling uncertainty is comparable.
KW - gravitational lensing: strong
KW - catalogues
KW - galaxies: elliptical and lenticular, cD
KW - GRAVITATIONALLY LENSED QUASARS
KW - STAR ADAPTIVE OPTICS
KW - EARLY-TYPE GALAXIES
KW - DARK-MATTER
KW - SDSS J0806+2006
KW - DISCOVERY
KW - SYSTEMS
KW - RATIO
KW - SHARP
U2 - 10.1093/mnras/stab532
DO - 10.1093/mnras/stab532
M3 - Journal article
VL - 503
SP - 1557
EP - 1567
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 2
ER -
ID: 271821808