2026A&A...706L..12N

Query : 2026A&A...706L..12N

2026A&A...706L..12N - Astronomy and Astrophysics, volume 706L12 (2026/2-1)

Time delays for the quadruply lensed QSO GraL J1651-0417 based on ZTF light curves.

NUNEZ-PIZARRO C., AREVALO P., AVILA-VERA F. and MOTTA V.

Abstract (from CDS):

Aims We aim to test the possibility of measuring significant and accurate time delays between images of lensed quasars using public photometric surveys. We show the case for the large-separation, quadruply lensed quasi-stellar object (QSO) GraL J1651-0417.
Methods We retrieved publicly available light curves in the g and r bands from the ZTF forced photometry service centred on the four images of the quasar. We estimated the time delays of the flux variations in the different images using the discrete correlation function and bootstrapping methods separately for each band. The delays were independently predicted by fitting two mass lens model (SIS+γ and SPL+γ).
Results The ZTF light curves reveal significant correlations and time delays. In the r band, we measure delays of 579 ± 40 days for A-B, 366 ± 26 days for A-C, and 698 ± 29 days for A-D, which are fully consistent with the predictions from the lens model.

Abstract Copyright: © The Authors 2026

Journal keyword(s): gravitational lensing: strong - quasars: general - quasars: individual: GraL J1651-0417

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [SDK2021] GraL J165105.3-041725 gLS 16 51 05.3 -04 17 25           ~ 6 0

Query : 2026A&A...706L..12N

Basic data :
[SDK2021] GraL J165105.3-041725 -- Gravitational Lens System (lens+images)
Other object types: otypes_help 		gLS ([SDK2021])
ICRS coord. (ep=J2000) : 		16 51 05.3 -04 17 25 (Optical) [ ] D 2021ApJ...921...42S
FK4 coord. (ep=B1950 eq=1950) : 		16 48 26.8 -04 12 23 [ ]
Gal coord. (ep=J2000) : 		014.0844 +24.2555 [ ]
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[SDK2021] GraL J165105.3-041725

References (6 between 1850 and 2026) (Total 6)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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