0 Assigned ID: 5472 ----- Attempting Submission 1 (Tue Mar 26 16:26:47 GMT 2024) ----- Resubmitted August 8 for review by M. Revalski. 1) Added dither pattern to UVIS observations 2) Changed aperture for UVIS observations 3) Adjusted UVIS flash to 21 s 1680968982 ----- Attempting Submission 1 (Mon Aug 05 14:30:34 GMT 2024) ----- HST Phase II Proposal 17818 successfully submitted. Receipt: # 17818-1 ----- Attempting Submission 2 (Thu Aug 08 15:47:45 GMT 2024) ----- Structure of the Extreme-UV Continuum Source in the Heavily Microlensed Quasar SDSS J1339+1310 We propose to image the gravitationally lensed quasar SDSS J1339+1310 using a total of 12 orbits during HST Cycles 32 & 33. These regular monitoring observations of this heavily microlensed system with WFC3-UVIS in the F275W band will enable two primary science objectives: (1) We will analyze the microlensing variability in the resulting HST UV light curves in conjunction with existing optical light curves to make a measurement of the size of this quasar's continuum emission source at extreme-UV (EUV) wavelengths (83.7 nm in the rest frame). Only one other empirical measurement of a quasar's accretion disk size has ever been made at these extremely short UV wavelengths. (2) Coupling the new EUV size measurement with an existing measurement in the rest-frame near-UV will permit an empirical constraint on the temperature profile in this quasar's accretion disk. Empirical measurements of temperature profiles in other systems are quite discrepant from the predictions of basic thin disk models. We have also requested one deep observation with WFC3-IR in the F160W (H-band) to permit accurate modeling of the lens galaxy's mass profile. HST is the only existing telescope capable of making these UV observations with the angular resolution required to separate the flux from this lensed quasar's individual images and its lens galaxy. This obsering program was approved for 6 orbits in Cycle 32 and 6 orbits in Cycle 33. This Phase II proposal covers the 6 Cycle 32 observations; the Cycle 33 observations will be scheduled in a separate Phase II proposal prior to Cycle 33. During Cycle 32, we will conduct 6 orbits of WFC3 observations to monitor SDSS1339 in the UV (F275W), and we will collect 1 deep image in the IR (F160W). Since the size scale of the quasar's BLR is much larger than the accretion disk, it is important to avoid contaminating emission line flux. The bandwidth of F275W corresponds to 775 A < lambda_{rest} < 898 A in the rest frame, just short of the Lyman limit at 912 A, but well clear of the Lyman beta emission line at 1026 A. Exposure times were calculated using the WFC3-UVIS Exposure Time Calculator (ETC) by direct upload of the 2016 UVIS G280 grism spectra with the goal of achieving S/N = 100 for the fainter image (image A). Each F275W observing epoch must be separated from a previous epoch by the system's time delay of 47+/-5 days. The need to differentiate between intrinsic and extrinsic (microlensing) variability drives the requirement for a (loose) scheduled monitoring interval in our observations. In Cycle 32 we have scheduled 5 sequenced WFC3/UVIS observations separated by the 47+/-5 day time delay. Each WFC3/UVIS observation consists of a dithered F275W exposure, each of which is timed to accomplish S/N = 100 in the fainter of the two quasar images (image A) without saturating the brighter image (B). We made use of the WFC3-UVIS-DITHER-BOX pattern with default line and point spacing, comprising four 540 sec sub-exposures. The dithering scheme will allow for correction of cosmic rays and detector anomalies, while also sub-sampling the UVIS PSF. To minimize losses from charge transfer effeciency (CTE) we employed the UVIS2-C1K1C-CTE aperture in all F275W images. We will also conduct one deep observation of SDSS1339 using WFC3/IR in F160W to allow for an accurate photometric fit of the lens galaxy. We uploaded ground-based VLT-XSHOOTER spectra into the WFC3-IR ETC to develop the the observing scheme for this single deep observation, with a goal of accomplishing S/N =100 for the elliptical lens galaxy without saturating either of the quasar images. The lens galaxy has a half-light radius of 1 arcsec and the quasar images are separated by 1.7 arcsec, so we will use the WFC3-IR-DITHER-BLOB dither pattern with its larger point spacing. This ensures that the target will not overlap any of the same pixels during subexposures while also avoiding the IR dust blobs on the detector. To ensure adequate sub-PSF sampling, we used the WF3C-IR-DITHER-LINE-3POINT subpattern at each primary dither location. Dr. Christopher Morgan has served as Co-I on numerous Chrandra and Hubble Space Telescope programs, and most recently he was PI of a program on Chandra to monitor the target of this present HST proposal at X-ray wavlengths. Imaging data from both of those space-based observatories has appeared in 12 of his refereed publications in the past 10 years. He is the PI of the ground-based USNA-USNO lensed quasar monitoring campaign, a program to monitor gravitationally lensed quasars at optical and UV wavelengths. Dr. Morgan is an expert in the modeling of quasar lens galaxy mass profiles and the analysis of quasar microlensing variability, with >20 refereed publications on this topic. Dr. Xinyu Dai and Dr. George Chartas have 20+ years of experience in the analysis of space-based imaging and specroscopy of gravitationally lensed qusars. Dr Luis Goicoechea is PI of the GLENDAMA lensed quasar monitoring program at the 2.0m Liverpool Telescope. He will be providing the 13-season ground-based optical light curves for this investigation. Dr. Vyacheslav Shalyapin is a Co-I of the GLENDAMA program. Supermassive Black Holes and Active Galaxies Galaxies 6 false true false false false false SUPPORTED GALAXY ELLIPTICAL GRAVITATIONAL LENS QUASAR J2000 J2000 F_{\lambda} = 6.76 \times 10^{-17} erg cm^{-2} s^{-1} \AA^{-1} at 2750 \AA as measured by HST WFC3/UVIS G280 Grism Spectroscopy. WFC3/UVIS Imaging No No F275W WFC3/IR Imaging No No F160W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F275W POS-TARG DITHER DITHER 3 5.183 WFC3-IR-DITHER-LINE-3PT false true 2.42 3 41.859 POS-TARG WFC3-IR-DITHER-BLOB 41.788 1 true POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 2 false /System/Volumes/Data/solaris/user1/wskipper/OP-cache/17818-v01.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. 1739634182000 276.10919401767154 (Tic-Visit :proposal-id 17818 :visit-id "01" :proposal-version -1 :trans-version "20250929" :date "15-Dec-2025 13:25:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 940096 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17818 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17818 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2383 :al-overhead-at-end 0 :internal-dur-at-end 728 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2974 :pcs-gap 0 ) true 1 0 /System/Volumes/Data/solaris/user1/wskipper/OP-cache/17818-v02.xml Timing link suitability includes constraints ([03 After 02 by 42.0 to 52.0 days]) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. 1765568988000 303.6576397312697 (Tic-Visit :proposal-id 17818 :visit-id "02" :proposal-version -1 :trans-version "20250929" :date "15-Dec-2025 13:25:39.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17818 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17818 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2561 :al-overhead-at-end 119 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2974 :pcs-gap 0 ) true 1 0 /System/Volumes/Data/solaris/user1/wskipper/OP-cache/17818-v03.xml Timing link suitability includes constraints ([03 After 02 by 42.0 to 52.0 days] [04 After 03 by 42.0 to 52.0 days]) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17818 :visit-id "03" :proposal-version -1 :trans-version "20250929" :date "15-Dec-2025 13:25:39.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17818 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17818 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2561 :al-overhead-at-end 119 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2974 :pcs-gap 0 ) true 1 0 /System/Volumes/Data/solaris/user1/wskipper/OP-cache/17818-v04.xml Timing link suitability includes constraints ([04 After 03 by 42.0 to 52.0 days] [05 After 04 by 42.0 to 52.0 days]) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17818 :visit-id "04" :proposal-version -1 :trans-version "20250929" :date "15-Dec-2025 13:25:39.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17818 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17818 :visit-id "04" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2561 :al-overhead-at-end 119 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2974 :pcs-gap 0 ) true 1 0 /System/Volumes/Data/solaris/user1/wskipper/OP-cache/17818-v05.xml Timing link suitability includes constraints ([05 After 04 by 42.0 to 52.0 days] [06 After 05 by 42.0 to 52.0 days]) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17818 :visit-id "05" :proposal-version -1 :trans-version "20250929" :date "15-Dec-2025 13:25:39.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17818 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17818 :visit-id "05" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2561 :al-overhead-at-end 119 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2974 :pcs-gap 0 ) true 1 0 /System/Volumes/Data/solaris/user1/wskipper/OP-cache/17818-v06.xml Timing link suitability includes constraints ([06 After 05 by 42.0 to 52.0 days]) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17818 :visit-id "06" :proposal-version -1 :trans-version "20250929" :date "15-Dec-2025 13:25:39.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17818 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17818 :visit-id "06" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2561 :al-overhead-at-end 119 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2974 :pcs-gap 0 ) true 1 0