Assigned ID: 563 ----- Attempting Submission 1 (Fri Feb 25 19:47:36 GMT 2011) ----- HST Phase I Proposal 563 (J0050_HST.apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 25 22:04:18 GMT 2011) ----- HST Phase I Proposal 563 (J0050_HST.apt) successfully submitted. ----- Attempting Submission 3 (Sat Feb 26 01:20:59 GMT 2011) ----- ----- Attempting Submission 1 (Fri Jul 08 18:01:00 GMT 2011) ----- A Candidate Lensed Quasar at z=6.25 We have identified a candidate lensed quasar at z=6.25 through an ongoing Cycle 18 SNAP program surveying z~6 quasars with WFC3/IR imaging. The object is resolved into multiple components on subarcsecond scales; however, the shallow, single-band SNAP data does not provide a conclusive determination as to the nature of these components. We propose follow-up imaging with ACS/WFC F775W and WFC3/IR F105W. This imaging will test various lensing hypotheses for the observed components, and color selection in these two bands will easily discriminate foreground and background objects. Faint objects seen within 0.8'' of the quasar may be lensed images or possibly galaxies at the quasar redshift, indicating the late stages of merging activity. We will take advantage of the full field-of-view to identify companion galaxies to a quasar at one of the highest redshifts known.
We will obtain ACS/WFC-F775W and WFC3/IR-F105W imaging of a candidate lensed quasar at z=6.25. The ACS imaging comprises 3 orbits and will primarily be used to detect faint foreground galaxies within the field, at a depth of i(AB)~28.7 (3sigma). Objects at the redshift of the quasar will have very red i-Y colors and can be discriminated from foreground galaxies by i-Y color or i non-detection. The WFC3 imaging comprises 2 orbits and will be used to obtain deep, high-resolution imaging of the quasar, with the goal of deblending components separated by as little as ~0.15''. Part of the second WFC3 orbit will be utilized to observe a nearby PSF star (1' from the quasar) with similar colors as the quasar. The WFC3 imaging will also be the detection band for z~6 galaxies in the field, with a depth of Y(AB)~27. The WFC3 imaging consists of two patterns (4 and 2 dithers) with the using the IR-FIX aperture with a slight offset to avoid the center of the array. The patterns should provide optimal resolution. The same patterns and offsets are repeated for the shorter PSF observations, which use the IRSUB128-FIX aperture and SPARS10 sampling in order to capture the PSF star at high S/N without saturation. AGN/QUASARS 12 false 0.0 0.0 false false false false SUPPORTED GALAXY QSO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 z=20.5 (AB) STAR M V-IV PSF star selected based on SDSS/2MASS colors to have a similar SED as the quasar. This star is not above the 2MASS catalog detection limit, but we have determined from aperture photometry that it has J=16.9 and H=15.9. J2000 J(Vega)=16.8 WFC3/IR Imaging No No F105W ACS/WFC Imaging No No F775W POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 2 false POS-TARG DITHER 0.636 LINE false false 2 41.788 WFC3-IR-DITHER-LINE 6 false POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 7 false POS-TARG DITHER 3.011 LINE false false 2 85.28 ACS-WFC-DITHER-LINE 8 false /home/ian/research/hizQSO/HSTsnap/lenses/J0050+3445/HST_Phase2/OP-cache/j0050-v01.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12493 :visit-id "01" :proposal-version -1 :trans-version "20110509" :date "07-Jul-2011 17:30:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12493 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12493 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2942 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12493 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3052 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12493 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3052 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 3 0 /home/ian/research/hizQSO/HSTsnap/lenses/J0050+3445/HST_Phase2/OP-cache/j0050-v02.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12493 :visit-id "02" :proposal-version -1 :trans-version "20110509" :date "07-Jul-2011 10:34:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1089424 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12493 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12493 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2875 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12493 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2999 :al-overhead-at-end 0 :internal-dur-at-end 228 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 2 0