Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI) — VII. Discovery and Confirmation of Three Strongly Lensed Quasars

Kavli Affiliate: Paul L. Schechter

| First 5 Authors: Anton T. Jaelani, Cristian E. Rusu, Issha Kayo, Anupreeta More, Alessandro Sonnenfeld

| Summary:

We present spectroscopic confirmation of three new two-image gravitationally
lensed quasars, compiled from existing strong lens and X-ray catalogs. Images
of HSC J091843.27$-$022007.5 show a red galaxy with two blue point sources at
either side, separated by 2.26 arcsec. This system has a source and a lens
redshifts $z_s=0.804$ and $z_{ell}=0.459$, respectively, as obtained by our
follow-up spectroscopic data. CXCO J100201.50$+$020330.0 shows two point
sources separated by 0.85 arcsec on either side of an early-type galaxy. The
follow-up spectroscopic data confirm the fainter quasar has the same redshift
with the brighter quasar from the SDSS fiber spectrum at $z_s=2.016$. The
deflecting foreground galaxy is a typical early-type galaxy at a redshift of
$z_{ell}=0.439$. SDSS J135944.21$+$012809.8 has two point sources with quasar
spectra at the same redshift $z_s=1.096$, separated by 1.05 arcsec, and fits to
the HSC images confirm the presence of a galaxy between these. These
discoveries demonstrate the power of the Hyper Suprime-Cam Subaru Strategic
Program (HSC-SSP)’s deep imaging and wide sky coverage. Combined with existing
X-ray source catalogues and follow-up spectroscopy, the HSC-SSP provides us
unique opportunities to find multiple-image quasars lensed by a foreground
galaxy.

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