Survey of Gravitationally Lensed Objects in HSC Imaging (SuGOHI)-VII. Discovery and confirmation of three strongly lensed quasars

Anton T. Jaelani, Cristian E. Rusu, Issha Kayo, Anupreeta More, Alessandro Sonnenfeld, John D. Silverman, Malte Schramm, Timo Anguita, Naohisa Inada, Daichi Kondo, Paul L. Schechter, Khee Gan Lee, Masamune Oguri, James H.H. Chan, Kenneth C. Wong, Kaiki T. Inoue

Research output: Contribution to journalReview articlepeer-review

Abstract

We present spectroscopic confirmation of three new two-image gravitationally lensed quasars, compiled from existing strong lens and X-ray catalogues. 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 zs = 0.804 and z = 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 Sloan Digital Sky Survey (SDSS) fiber spectrum at zs = 2.016. The deflecting foreground galaxy is a typical early-type galaxy at a redshift of z = 0.439. SDSS J135944.21+012809.8 has two point sources with quasar spectra at the same redshift zs = 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.

Original languageEnglish
Pages (from-to)1487-1493
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume502
Issue number1
DOIs
Publication statusPublished - 2021

Keywords

  • Gravitational lensing: Strong-methods: Observational

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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