Matches in SemOpenAlex for { <https://semopenalex.org/work/W3214380060> ?p ?o ?g. }
- W3214380060 endingPage "A113" @default.
- W3214380060 startingPage "A113" @default.
- W3214380060 abstract "High-redshift binary quasars provide key insights into mergers and quasar activity, and are useful tools for probing the spatial kinematics and chemistry of galaxies along the line-of-sight. However, only three sub-10-kpc binaries have been confirmed above $z=1$. Gravitational lensing would provide a way to easily resolve such binaries, study them in higher resolution, and provide more sightlines, though the required alignment with a massive foreground galaxy is rare. Through image deconvolution of StanCam Nordic Optical Telescope (NOT) monitoring data, we reveal two further point sources in the known, $z approx 2.38$, quadruply lensed quasar (quad), J1721+8842. An ALFOSC/NOT long-slit spectrum shows that the brighter of these two sources is a quasar with $z = 2.369 pm 0.007$ based on the C III] line, while the C III] redshift of the quad is $z = 2.364 pm 0.003$. Lens modelling using point source positions rules out a single source model, favouring an isothermal lens mass profile with two quasar sources separated by $sim6.0$ kpc (0.73$^{prime prime}$) in projection. Given the resolving ability from lensing and current lensed quasar statistics, this discovery suggests a large population of undiscovered, unlensed sub-10-kpc binaries. We also analyse spectra of two images of the quad, showing narrow Ly$alpha$ emission within the trough of a proximate damped Ly$alpha$ absorber (PDLA). An apparent mismatch between the continuum and narrow line flux ratios provides a new potential tool for simultaneously studying microlensing and the quasar host galaxy. Signs of the PDLA are also seen in the second source, however a deeper spectrum is still required to confirm this. Thanks to the multiple lines-of-sight from lensing and two quasar sources, this system offers simultaneous sub-parsec and kpc-scale probes of a PDLA." @default.
- W3214380060 created "2021-11-22" @default.
- W3214380060 creator A5000309781 @default.
- W3214380060 creator A5002773881 @default.
- W3214380060 creator A5005871574 @default.
- W3214380060 creator A5009681773 @default.
- W3214380060 creator A5016822093 @default.
- W3214380060 creator A5030951060 @default.
- W3214380060 creator A5075040267 @default.
- W3214380060 creator A5087824287 @default.
- W3214380060 date "2022-01-01" @default.
- W3214380060 modified "2023-10-02" @default.
- W3214380060 title "J1721+8842: a gravitationally lensed binary quasar with a proximate damped Lyman-<i>α</i> absorber" @default.
- W3214380060 cites W1531680348 @default.
- W3214380060 cites W1762019482 @default.
- W3214380060 cites W1969206417 @default.
- W3214380060 cites W1972796855 @default.
- W3214380060 cites W1986164846 @default.
- W3214380060 cites W2026398372 @default.
- W3214380060 cites W2029058744 @default.
- W3214380060 cites W2029343094 @default.
- W3214380060 cites W2038115849 @default.
- W3214380060 cites W2042777467 @default.
- W3214380060 cites W2064615924 @default.
- W3214380060 cites W2073396434 @default.
- W3214380060 cites W2078503872 @default.
- W3214380060 cites W2080105291 @default.
- W3214380060 cites W2093117202 @default.
- W3214380060 cites W2130279199 @default.
- W3214380060 cites W2132463704 @default.
- W3214380060 cites W2142238829 @default.
- W3214380060 cites W2143927178 @default.
- W3214380060 cites W2159042693 @default.
- W3214380060 cites W2192976736 @default.
- W3214380060 cites W2268788021 @default.
- W3214380060 cites W2333656526 @default.
- W3214380060 cites W2336502591 @default.
- W3214380060 cites W2506929068 @default.
- W3214380060 cites W2523767223 @default.
- W3214380060 cites W2558342615 @default.
- W3214380060 cites W2589868517 @default.
- W3214380060 cites W2620079850 @default.
- W3214380060 cites W2737696297 @default.
- W3214380060 cites W2786765968 @default.
- W3214380060 cites W2789522404 @default.
- W3214380060 cites W2792901079 @default.
- W3214380060 cites W2798336535 @default.
- W3214380060 cites W2798507241 @default.
- W3214380060 cites W2883727623 @default.
- W3214380060 cites W2889451462 @default.
- W3214380060 cites W2896084564 @default.
- W3214380060 cites W2900952343 @default.
- W3214380060 cites W2902534922 @default.
- W3214380060 cites W2910477650 @default.
- W3214380060 cites W2950114635 @default.
- W3214380060 cites W2950894641 @default.
- W3214380060 cites W2961457169 @default.
- W3214380060 cites W2963982225 @default.
- W3214380060 cites W2964031873 @default.
- W3214380060 cites W2968206067 @default.
- W3214380060 cites W2980192413 @default.
- W3214380060 cites W2982660894 @default.
- W3214380060 cites W2987997417 @default.
- W3214380060 cites W2995297304 @default.
- W3214380060 cites W3031984016 @default.
- W3214380060 cites W3034792382 @default.
- W3214380060 cites W3037192494 @default.
- W3214380060 cites W3041794221 @default.
- W3214380060 cites W3082066930 @default.
- W3214380060 cites W3090897809 @default.
- W3214380060 cites W3098832119 @default.
- W3214380060 cites W3099158888 @default.
- W3214380060 cites W3099268282 @default.
- W3214380060 cites W3099334928 @default.
- W3214380060 cites W3099564524 @default.
- W3214380060 cites W3099983903 @default.
- W3214380060 cites W3100757740 @default.
- W3214380060 cites W3101477146 @default.
- W3214380060 cites W3101616994 @default.
- W3214380060 cites W3101783990 @default.
- W3214380060 cites W3102014803 @default.
- W3214380060 cites W3102074119 @default.
- W3214380060 cites W3102467320 @default.
- W3214380060 cites W3102648766 @default.
- W3214380060 cites W3102666820 @default.
- W3214380060 cites W3103692215 @default.
- W3214380060 cites W3103902072 @default.
- W3214380060 cites W3104056597 @default.
- W3214380060 cites W3104201792 @default.
- W3214380060 cites W3104697796 @default.
- W3214380060 cites W3105101872 @default.
- W3214380060 cites W3105340166 @default.
- W3214380060 cites W3105423222 @default.
- W3214380060 cites W3105582871 @default.
- W3214380060 cites W3106299588 @default.
- W3214380060 cites W3113293709 @default.
- W3214380060 cites W3119802639 @default.
- W3214380060 cites W3121278851 @default.