Science Keywords: Select from 2 to 5 items.
0
Assigned ID: 3872
----- Attempting Submission 1 (Tue Nov 08 15:35:37 GMT 2022) -----
Joint NRAO/HST
The specified GS Acq Scenario is not in the current list of valid scenarios.
The specified GS Acq Scenario is not in the current list of valid scenarios.
The specified GS Acq Scenario is not in the current list of valid scenarios.
Comments for Submission 6:
Adjusted exposure times to accommodate the 1-gyro mode. Visit 13 needs to run the visit planner locally (remote run took too long to do).
Comments for Submission 5:
1. Changed WFC3 IR dither spacing from integer to non-integer values for better PSF sampling.
----------------------------------------------
Increased POSTFLASH for UVIS observations to reach a background of 20e-/pix to minimize CTE effects.
1956431476
----- Attempting Submission 1 (Sun Nov 20 15:51:56 GMT 2022) -----
----- Attempting Submission 2 (Thu Nov 24 05:26:54 GMT 2022) -----
----- Attempting Submission 3 (Tue Nov 29 15:39:15 GMT 2022) -----
----- Attempting Submission 4 (Fri Dec 02 01:38:57 GMT 2022) -----
----- Attempting Submission 5 (Fri Dec 16 04:43:38 GMT 2022) -----
----- Attempting Submission 6 (Thu Jun 20 17:01:06 GMT 2024) -----
Visit 13 needs to run the visit planner which took too long to run remotely
A Complete Census of Luminous Sub-arcsec Dual/Lensed Quasars at z > 1.5
The galactic-scale (<~30 kpc) environment of quasars is of critical importance to understanding the formation and dynamical inspiral of supermassive black hole pairs, the impact of mergers on quasar fueling, and the population of small-scale gravitationally lensed quasars. Here we propose VLA A-config Ku- and C-band imaging of 11 newly discovered sub-arcsec candidate double quasars (physical pairs or lenses) at z>1.5. These targets are a subset of a complete sample of high-fidelity double quasars at z>1.5 selected using resolved pairs in Gaia DR3 around spectroscopically confirmed SDSS quasars. The VLA imaging will confirm the double quasar nature and measure radio spectral indices for both components. The joint HST IR imaging will conclusively differentiate the dual quasar and lensed quasar scenarios. Combined with literature results and additional follow-ups (pairs with separations > 1 arcsec), the proposed observations will deliver the first complete census of galactic-scale quasar pairs (and lenses) at cosmic noon, critical to the understanding of SMBH binary formation, merger-induced quasar fueling, and the abundance of lensed quasars over these scales.
This program will conduct WFC3/IR F160W, WFC3/UVIS F475W, and F625W imaging of 11 candidate z>1.5 kpc-scale dual/lensed quasars.The targets are a subset of a complete sample of high-fidelity double quasars at z>1.5 selected using resolved pairs in Gaia DR3 around spectroscopically confirmed SDSS quasars. Deep HST IR F160W imaging will conclusively differentiate the dual quasar and strongly lensed quasar scenarios. The additional UVIS imaging will be used to fill the unused time in an orbit, which will help rule out stellar interlopers (in addition to the joint VLA radio imaging) based on the (g-r) vs (r-H) color-color diagram.
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).
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. Accounting for overheads (including 6.5 min for guide star acquisition and ~6 min for SI overheads; WFC3 has no target acquisition overhead), we use 11 HST orbits in total for 11 targets to distinguish between dual and strongly lensed quasars. As noted at the end of the approved VLA proposal, the additional UVIS (F475W and F625W) imaging will be used to fill the unused time in an orbit for each target, which will help rule out stellar interlopers based on the (F475W-F625W) and (F625W-F160W) colors.
Visit 07 does not have any UVIS observations because otherwise it would not have any guide stars. Visit 11 does not have any UVIS observations either because the target has archival UVIS (F475W and F814W) imaging.
PI Liu is experienced with observations of quasars and candidate binary supermassive black holes. Co-Is Shen is an expert on binary supermassive black holes, host galaxies, and general quasar observations. Co-I Chen is experienced with optical and radio observations of quasars.
The team is conducting a systematic search of candidate kpc-scale dual quasars at z>1.5. The team is building up the sample size and working on multi-wavelength follow up of candidates. The team is experienced with HST imaging data (especially WFC3) and the related analysis.
Supermassive Black Holes and Active Galaxies
6
false
false
false
false
false
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SUPPORTED
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J2000
J2000
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GALAXY
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GALAXY
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GALAXY
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GALAXY
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GALAXY
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GALAXY
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GALAXY
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GALAXY
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GALAXY
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GALAXY
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WFC3/IR
Imaging
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F160W
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F160W
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F160W
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Imaging
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F160W
WFC3/IR
Imaging
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No
F160W
WFC3/IR
Imaging
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No
F160W
WFC3/IR
Imaging
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F160W
WFC3/IR
Imaging
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No
F160W
WFC3/IR
Imaging
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F160W
WFC3/IR
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F160W
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