Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA). SDSS J1608+2716: A Subarcsecond Quadruply Lensed Quasar at z = 2.575

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...

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Vydáno v:Astrophysical journal. Letters Ročník 955; číslo 1; s. L16
Hlavní autoři: Li, Junyao, Liu, Xin, Shen, Yue, Oguri, Masamune, Gross, Arran C., Zakamska, Nadia L., Chen, Yu-Ching, Hwang, Hsiang-Chih
Médium: Journal Article
Jazyk:angličtina
Vydáno: Austin The American Astronomical Society 01.09.2023
IOP Publishing
Témata:
Active galactic nuclei
Adaptive optics
Astrometry
Disk galaxies
Double quasars
Field cameras
Galaxies
Gravitational lenses
Hubble Space Telescope
Image resolution
Infrared imaging
Optics
Point sources
Quasars
Red shift
Space telescopes
Spectroscopy
Strong gravitational lensing
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ISSN:2041-8205, 2041-8213
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Shrnutí: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.
Bibliografie:Galaxies and Cosmology
AAS47732
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 14
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/acf27a