17304( 4) - 07-Jun-2024 18:57:30 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17304 Version: 4 Check-in Time: 07-Jun-2024 18:57:30 STScI Edit Number: 2 Title A Systematic Survey of Close Dual and Lensed SMBHs at Cosmic Noon ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Xin Liu University of Illinois at Urbana - Y Champaign ------------------------------------------------------------------------------------ Abstract STIS G430L slit spectroscopy and WFC3 F160W imaging are proposed to systematically confirm close (<5 kpc) dual and strong gravitationally lensed quasars at Cosmic Noon (11 selected using two new techniques that have been developed recently (i.e., "varstrometry" and Gaia Multi Peak). Deep HST IR F160W imaging will detect the extended host galaxy mergers and low-surface-brightness tidal features (indicative of ongoing mergers) or foreground lenses to umambiguously distinguish between dual and lensed quasars. STIS slit spectroscopy will detect 17304( 4) - 07-Jun-2024 18:57:30 - [ 2] spatially resolved spectra simultaneously covering both nuclei. In dual quasars, the unresolved quasars will be carefully modeled (by PSFs) and subtracted in order to robustly reveal the (much fainter) extended host galaxies underlying each quasar. Furthermore, after carefully subtracting both the quasars (PSFs) and the host galaxies (using Sersic models), we may discover low surface brightntess tidal features as direct evidence for mergers. Alternatively, in lensed quasars, the unresolved lensed quasar images will be carefully modeled (using PSFs) and subtracted in order to either detect or put stringnet upper limits on the foreground lens galaxy. Using the structure decomposition constraints (on both the lensed images and the lens), we will perform strong lensing mass modeling tests in order to quantitatively assess the strong gravitational lensing scenario. The results will reveal bona-fide high-redshift kpc-scale dual quasars that are still largely illusive (but are predicted to be abundant by theory). For the WFC3 IR F160W imaging, we adopt the 256x256 subarray (30"x30" FOV, corresponding to ~250kpcx250kpc at z=2, more than enough to cover the double quasars and host galaxies). We adopt SPARS10 (NSAMP=15) to increase the dynamic range and account for potential saturation of bright cores, and the 4-step BOX dither (similar to the default WFC3-IR-DITHER-BOX-MIN but with increased spacing to meet the >10 pixel requirement to avoid persistence effects) for cosmic-ray and bad-pixel rejection, to better sample the PSF for optimal effective resolution. Since our primary goal is to detect the lens galaxy (or the lack thereof) rather than to accurately measure host galaxy morphology, this dither pattern is sufficient - nor do we require a dedicated PSF observation; we will use field stars and/or recent archival data to build an empirical PSF template. The IR depth assuming 412s on-source exposure is H~24 AB mag arcsec^-2 (3\sigma), sufficient to detect double cores and rule out lensing. For the STIS slit spectroscopy, we use the 52x0.2" slit and the G430L aperture. The slit will be placed across both cores to obtain the spectrum for both components. The separation between the two cores is ~0.3"--0.7", and we will use the point-source mode for acquisition. The conversion between the PA of the two cores and the ORIENT parameter is: ORIENT=PA+45.35 or ORIENT=PA+225.35 according to Table 11.2 of the STIS Instrument Handbook. ------------------------------------------------------------------------------------ 17304( 4) - 07-Jun-2024 18:57:30 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ0956+69 GALAXY, QUASAR RA=09H56M36.4500S, J2000 Z = r=18.01, z=17.59 00 DEC=+69D00'28.10" 1.975 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ1002+44 GALAXY, QUASAR RA=10H02M29.4500S, J2000 Z = r=18.27, z=17.99 49 DEC=+44D49'42.84" 2.055 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSSJ1008+03 GALAXY, QUASAR RA=10H08M59.5500S, J2000 Z = r=19.41, z=18.79 51 DEC=+03D51'4.40" 1.746 Reference Frame: ICRS Extended: NO Comments: New replacement target. The old target (SDSSJ1608+2716) has a duplicate WFC3 IR F160W image (recently observed after proposal submission). The new target has existing spatially resolved spectroscopy, but it still needs WFC3 IR F160W imaging to achieve the science goals. Please advise if TTRB is needed. ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSSJ1238+01 GALAXY, QUASAR RA=12H38M21.6600S, J2000 Z = r=18.82, z=18.55 05 DEC=+01D05'18.60" 3.159 Reference Frame: ICRS Extended: NO Comments: New replacement target. The old target (SDSSJ1625+4309) has a duplicate STIS spectrum (recently observed after proposal submission). The new target has existing spatially resolved spectroscopy, but it still needs WFC3 IR F160W imaging to achieve the science goals. Please advise if TTRB is needed. ------------------------------------------------------------------------------------------------------------------------------------ 17304( 4) - 07-Jun-2024 18:57:30 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 1.365 Line_Spacing 0.975 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO Pattern_Comments: increased dither spacing by 2.5x to avoid persistence effects ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 1.0 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17304( 4) - 07-Jun-2024 18:57:30 - [ 5] Visit: 01 (J0956_STIS_G430L) Visit Requirements: ORIENT 288.15D TO 288.15 D; ORIENT 108.15D TO 108.15 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ0956+6 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 30 S (30 900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ0956+6 STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 1200 S PATTERN 2 2 900 see below (2044 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ0956+6900 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SDSSJ0956+6900 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 1 none none 1 1 511.0 S SDSSJ0956+6900 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 1 none none 2 1 511.0 S SDSSJ0956+6900 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 2 none none 1 1 511.0 S SDSSJ0956+6900 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 2 none none 2 1 511.0 S 17304( 4) - 07-Jun-2024 18:57:30 - [ 6] Visit: 02 (J1002_STIS_G430L) Visit Requirements: ORIENT 151.05D TO 151.55 D; ORIENT 331.05D TO 331.55 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ1002+4 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 30 S (30 449 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ1002+4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 1200 S PATTERN 2 2 449 see below (2120 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ1002+4449 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SDSSJ1002+4449 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 1 none none 1 1 530.0 S SDSSJ1002+4449 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 1 none none 2 1 530.0 S SDSSJ1002+4449 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 2 none none 1 1 530.0 S SDSSJ1002+4449 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 2 none none 2 1 530.0 S 17304( 4) - 07-Jun-2024 18:57:30 - [ 7] Visit: 03 (J1008_IR_F160W) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ1008+0 WFC3/IR MULTIAC IRSUB256 F160W SAMP-SEQ=SPARS10, NSAMP=15 5 DEF PATTERN 1 1 351 CUM (2062.573 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 1 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 2 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 3 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 4 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 5 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 1 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 2 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 3 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 4 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 5 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 1 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 2 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 3 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 4 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 5 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 1 none 1 N/A CUM 17304( 4) - 07-Jun-2024 18:57:30 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 2 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 3 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 4 none 1 N/A CUM SDSSJ1008+0351 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 5 none 1 N/A CUM 17304( 4) - 07-Jun-2024 18:57:30 - [ 9] Visit: 04 (J1238_IR_F160W) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ1238+0 WFC3/IR MULTIAC IRSUB256 F160W SAMP-SEQ=SPARS10, NSAMP=15 5 DEF PATTERN 1 1 105 CUM (2062.573 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 1 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 2 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 3 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 4 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 1 none 5 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 1 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 2 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 3 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 4 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 2 none 5 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 1 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 2 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 3 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 4 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 3 none 5 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 1 none 1 N/A CUM 17304( 4) - 07-Jun-2024 18:57:30 - [ 10] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 2 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 3 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 4 none 1 N/A CUM SDSSJ1238+0105 1 WFC3/IR MULTIAC IRSUB256 F160W 4 none 5 none 1 N/A CUM 17304( 4) - 07-Jun-2024 18:57:30 - [ 11] Summary Form for Proposal 17304 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.2E1, F28X50LP, IRSUB256 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT, CR-SPLIT=2, NSAMP=15, SAMP-SEQ=SPARS10 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 108.15D TO 108.15 D, ORIENT 151.05D TO 151.55 D, ORIENT 288.15D TO 288.15 D, ORIENT 331.05D TO 331.55 D, PATTERN 1 1, PATTERN 2 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, G430L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names SDSSJ0956+6900, SDSSJ1002+4449, SDSSJ1008+0351, SDSSJ1238+0105 ------------------------------------------------------------------------------------------------------------------------------------