We report the results of a follow-up spectroscopic confirmation of two lensed quasars, six dual quasars, and eleven projected quasars that had previously been identified as lensed-quasar candidates in our earlier work. The spectroscopic data were obtained from two different sources: Palomar 200-inch Double Spectrograph (P200/DBSP) in California and publicly available datasets, including SDSS and DESI-EDR. The two lensed quasars (both pairs) have the following properties: E = 1{{{. }}}208, zs = 3. 105; E = 0{{{. }}}749, and zs = 2. 395. The six dual quasars have redshifts ranging from 0. 58 to 3. 28 and projected separations ranging from 15. 44 to 22. 54 kpc, with a mean separation of 17. 95 kpc. The eleven projected quasars have projected separations ranging from 10. 96 to 39. 07 kpc, with a mean separation of 22. 64 kpc. Additionally, there are three likely lensed quasars that cannot be definitively confirmed, included for two reasons. Firstly, their image separations (0 {{{. }}} 83, 0 {{{. }}} 98, and 0 {{{. }}} 93) are small compared to the seeing conditions during our observations (around 1 {{{. }}} 2). Secondly, no high signal-to-noise (S/N) lensing galaxy can be feasibly detected in Legacy Survey Imaging. Improved spectroscopy and/or imaging would be needed to confirm their lensing nature.
He et al. (Fri,) studied this question.