Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. 0 Assigned ID: 2637 ----- Attempting Submission 1 (Thu Nov 11 15:08:07 GMT 2021) ----- HST Phase I Proposal 2637 successfully submitted. Receipt: # 2637-1 ----- Attempting Submission 2 (Thu Nov 11 15:51:18 GMT 2021) ----- Joint NRAO/HST Replacing two targets that have been recently discovered to be stellar interlopers. 987050224 ----- Attempting Submission 1 (Wed Dec 01 14:42:45 GMT 2021) ----- ----- Attempting Submission 2 (Fri Jan 07 19:39:18 GMT 2022) ----- VLA Identification of Candidate Dual and Lensed Quasars from Gaia and HST We propose VLA A-config Ku- and C-band imaging to resolve the sub-arcsec double nuclei in 11 candidate dual/ lensed quasars. Our targets are selected using a new astrometric technique leveraging the universal AGN variability which produces astrometric signals from dual/lensed quasars. Gaia's precision astrometry combined with follow- up HST optical dual-band imaging provides strong candidates of dual/lensed quasars with close compact double cores. We adopt a refined target selection based on the HST optical color to better reject star-quasar superpositions compared to a pilot program. The proposed VLA dual-band imaging will detect two compact flat-spectrum radio cores to confirm our targets as dual or lensed quasars. Joint HST/IR imaging is requested to further test the lensing scenario to identify bona-fide dual quasars. Our sample probes a new regime at higher redshifts and smaller merger separations than previous work, where mergers are thought to be more important in driving the evolution of galaxies and supermassive black holes, providing empirical constraints on the stochastic gravitational wave background from binary supermassive black holes. WFC3/IR F160W imaging of 9 candidate high-redshift kpc-scale dual/lensed quasars. The targets are selected using a new astrometric technique leveraging the universal AGN variability which produces astrometric signals from dual/lensed quasars. The deep IR imaging will be used to test the gravitational lensing scenario in order to find bona-fide high-redshift kpc-scale dual quasars. We use the 512x512 subarray to reduce time of readout and buffer dump. This setting provides a FOV of 60"x60", or a physical transverse scale of 500x500 kpc at z~2, more than enough to cover the quasar host and close companions. There are stars of comparable flux to the quasar target in the FoV, which will be used as PSF reference to decompose the quasar+host system. We use the STEP25 MILTIACCUM mode to increase the dynamic range and deal with potential saturation of bright central sources. We use the 4-step BOX dither pattern between exposures to facilitate cosmic-ray and bad-pixel rejection, to better sample the PSF, and to improve the effective image resolution. With this setup we will be able to reach surface brightness depth as faint as H~25.65 mag/arcsec^2 (AB, 3\sigma detection within a circular 0.2" radius aperture, using an elliptical galaxy SED at z = 2) in 2700 s exposure. This depth is well suited for the gravitational lensing test, and to explore merger features and host morphologies for the targets. PI Liu has expertise on observations of quasars and candidate binary supermassive black holes. Co-Is Shen and Zakamska are experts on binary supermassive black holes, host galaxies, and general quasar observations. Co-I Chen is experienced with optical and radio observations of quasars. Co-I Hwang is experienced with Gaia astrometry. The team developed the novel astrometric technique that led to the discovery of these candidate kpc-scale dual quasars at z>2. The team is building up the sample size and working on multi-wavelength follow up of candidates selected with this systematic approach. The team has extensive knowledge on HST imaging data (especially WFC3) and the related analysis. Supermassive Black Holes and Active Galaxies 6 false false false false false false false false SUPPORTED GALAXY QUASAR J2000 J2000 GALAXY QUASAR J2000 J2000 GALAXY QUASAR Replacing J074800.55+314648.0 which was recently discovered to be a stellar interloper. J2000 J2000 GALAXY QUASAR J2000 J2000 GALAXY QUASAR J2000 J2000 GALAXY QUASAR J2000 J2000 GALAXY QUASAR J2000 J2000 GALAXY QUASAR J2000 J2000 GALAXY QUASAR Replacing J212243.01-002653.8, which was recently discovered to be a stellar interloper. J2000 J2000 WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W POS-TARG DITHER 1.716 LINE 1.095 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false The scheduling data was generated by CASM 29.2. 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