Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 502, Issue 1, Pages 1487-1493Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab145
Keywords
gravitational lensing: strong; methods: observational
Categories
Funding
- JSPS KAKENHI [JP17H02868, JP15H05892, JP18K03693, JP15H05896, JP20K04016, JP18H05868]
- Proyecto Fondecyt [N1190335]
- Ministry for the Economy, Development, and Tourism's Programa Inicativa Cientifica Milenio [IC 12009]
- Swiss National Science Foundation (SNSF)
- FIRST program from the Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST1238877]
- Japan Science and Technology Agency (JST)
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This study presents spectroscopic confirmation of three new two-image gravitationally lensed quasars, providing information on redshifts and various point sources for different systems. The data from different systems demonstrate the capability of the HSC-SSP project in discovering multiple-image quasars lensed by foreground galaxies.
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 z(s) = 0.804 and z(l) = 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 z(s) = 2.016. The deflecting foreground galaxy is a typical early-type galaxy at a redshift of z(l) = 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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