@article{57ce2eab1e154664990af8f66159e8f2,
title = "Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA). SDSS J1608+2716: A Subarcsecond Quadruply Lensed Quasar at z = 2.575",
abstract = "We report Hubble Space Telescope (HST) Wide Field Camera 3 deep IR (F160W) imaging of SDSS J1608+2716. This system, located at a redshift of z = 2.575, was recently reported as a triple-quasar candidate with subarcsecond separations (∼0.″25) based on selection from Gaia astrometry and follow-up Keck adaptive optics-assisted integral field unit spectroscopy. Our new HST deep IR imaging reveals the presence of a fourth point-like component located ∼0.″9 away from the triple system. Additionally, we detect an edge-on disk galaxy located in between the four point sources. The entire system exhibits a characteristic cusp structure in the context of strong gravitational lensing, and the observed image configuration can be successfully reproduced using a lens model based on a singular isothermal ellipsoid mass profile. These findings indicate that this system is a quadruply lensed quasar. Our results highlight the challenges associated with identifying dual/multiple quasars on ∼kiloparsec scales at high redshifts and emphasize the crucial role of deep, high-resolution IR imaging in robustly confirming such systems.",
author = "Junyao Li and Xin Liu and Yue Shen and Masamune Oguri and Gross, {Arran C.} and Zakamska, {Nadia L.} and Chen, {Yu Ching} and Hwang, {Hsiang Chih}",
note = "We thank A. Pagul and A. Vick for help with our HST observation. We thank the anonymous referee for giving constructive comments, which helped improve the quality of the paper. This work is supported by NSF grant AST-2108162. Y.S. acknowledges partial support from NSF grant AST-2009947. Support for Program number HST-GO-17287 was provided by NASA through grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. This work was supported by JSPS KAKENHI grant Nos. JP22H01260, JP20H05856, JP20H00181. This is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program GO-16892, GO-17287, GO-17269 (PI: X. Liu). The HST data used in this paper can be found in MAST doi: 10.17909/b92g-sp96 . We thank A. Pagul and A. Vick for help with our HST observation. We thank the anonymous referee for giving constructive comments, which helped improve the quality of the paper. This work is supported by NSF grant AST-2108162. Y.S. acknowledges partial support from NSF grant AST-2009947. Support for Program number HST-GO-17287 was provided by NASA through grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. This work was supported by JSPS KAKENHI grant Nos. JP22H01260, JP20H05856, JP20H00181. This is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program GO-16892, GO-17287, GO-17269 (PI: X. Liu). The HST data used in this paper can be found in MAST doi:10.17909/b92g-sp96.",
year = "2023",
month = sep,
day = "1",
doi = "10.3847/2041-8213/acf27a",
language = "English (US)",
volume = "955",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "American Astronomical Society",
number = "1",
}