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Verfasst von:Wertz, Olivier [VerfasserIn]   i
 Klüter, Jonas [VerfasserIn]   i
 Bastian, Ulrich [VerfasserIn]   i
 Wambsganß, Joachim [VerfasserIn]   i
Titel:Gaia GraL
Titelzusatz:Gaia DR2 gravitational lens systems - IV. Keck/LRIS spectroscopic confirmation of GRAL 113100−441959 and model prediction of time delays
Verf.angabe:O. Wertz, D. Stern, A. Krone-Martins, L. Delchambre, C. Ducourant, U. Gråe Jørgensen, M. Dominik, M. Burgdorf, J. Surdej, F. Mignard, R. Teixeira, L. Galluccio, J. Klüter, S.G. Djorgovski, M.J. Graham, U. Bastian, J. Wambsganss, C. Boehm, J.-F. LeCampion, and E. Slezak
E-Jahr:2019
Jahr:29 July 2019
Umfang:9 S.
Fussnoten:Gesehen am 18.02.2020
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2019
Band/Heft Quelle:628(2019) Artikel-Nummer A17, 9 Seiten
ISSN Quelle:1432-0746
Abstract:We report the spectroscopic confirmation and modeling of the quadruply imaged quasar GRAL 113100-441959, the first gravitational lens (GL) to be discovered from a machine learning technique that only relies on the relative positions and fluxes of the observed images without considering colour informations. Follow-up spectra obtained with Keck/LRIS reveal the lensing nature of this quadruply imaged quasar with redshift <i>z<i/><sub>s<sub/> = 1.090 ± 0.002, but show no evidence of the central lens galaxy. Using the image positions and <i>G<i/>-band flux ratios provided by <i>Gaia<i/> Data Release 2 as constraints, we modeled the system with a singular power-law elliptical mass distribution (SPEMD) plus external shear, to different levels of complexity. We show that relaxing the isothermal constraint of the SPEMD does not lead to statistically significant different results in terms of fitting the lensing data. We thus simplified the SPEMD to a singular isothermal ellipsoid to estimate the Einstein radius of the main lens galaxy , the intensity and position angle of the external shear , and we predict the lensing galaxy position to be with respect to image A. We provide time delay predictions for pairs of images, assuming a plausible range of lens redshift values <i>z<i/><sub>l<sub/> between 0.5 and 0.9. Finally, we examine the impact on time delays of the so-called source position transformation, a family of degeneracies existing between different mass density profiles that reproduce most of the lensing observables equally well. We show that this effect contributes significantly to the time delay error budget and cannot be ignored during the modeling. This has implications for robust cosmography applications of lensed systems. GRAL 113100-441959 is the first in a series of seven new spectroscopically confirmed GLs discovered from <i>Gaia<i/> Data Release 2.
DOI:doi:10.1051/0004-6361/201834573
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1051/0004-6361/201834573
 Volltext: https://www.aanda.org/articles/aa/abs/2019/08/aa34573-18/aa34573-18.html
 DOI: https://doi.org/10.1051/0004-6361/201834573
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1690267526
Verknüpfungen:→ Zeitschrift

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