I decided against making the POS TARG offsets larger than about 4.5" in order to preserve the larger area over which uniform exposure would be obtained (and to keep the gap-affected region of the image smaller), at the expense of having the gap overlap on some orbits of different visits. ----- Attempting Submission 1 (Tue Jul 01 22:55:29 GMT 2008) ----- All diagnostics concern a warning on the use of center=yes on a pattern, and POS TARG on exposures. I am aware of the result, which is the intended effect. This has already been cleared by my PC, Beth Perriello, on a previous draft. Assigned ID: 634 ----- Attempting Submission 1 (Fri Mar 07 21:57:11 GMT 2008) ----- Illuminating the HI Structure of a Proto-cluster Region at z=2.84 We propose very deep intermediate-band Lyman alpha imaging in the field of a newly-discovered proto-cluster region surrounding the extremely luminous QSO HS1549+19 at z=2.844. The large structure, initially discovered in a spectroscopic survey of galaxies in fields surrounding the brightest QSOs at z=2.5-2.8, represents an ideal laboratory for studying the response of the intergalactic medium to a source of ionizing photons that exceeds the UV background by factors >1000. Within a single pointing of WFC3-UVIS there are already more than 45 known Lyman alpha emitters, most of which are already spectroscopically confirmed, and at least 3 of which are giant ``Lyman alpha blobs''. Many of the objects have properties similar to those expected from the process of fluorescence, in which Lyman alpha emission is induced by the UV radiation field of the QSO in any HI gas that dense enough to remain partially self-shielded. Fortuitously, the F467M filter (Stromgren "b") in WFC3-UVIS is a perfect match to Lyman alpha at z=2.844. In combination with an equally deep broad-band continuum image, the observations will allow the construction of a Lyman alpha map tracing dense gas throughout the inner parts of a proto-cluster region at sub-kpc resolution. The ability to measure the spatial sub-structure and surface brightness distribution of Lya emission, relative to known protocluster galaxies and AGN, will illuminate the ``cosmic web'' in a dense region caught in a violent stage of formation.
We are proposing to obtain a total of 6 orbits WFC3/UVIS observations in the F475W filter, and a total of 24 orbits in F467M, in a single field. The program has been split into 6 visits of 5 orbits each, where one orbit is used for F475W and 4 orbits are used for F467M in each visit. The objective is to obtain the same sky coverage for the resulting mosaic while allowing for flexible scheduling- 2 30 degree "ORIENT" ranges have been specified for Visit 1, with Visits 2-6 constrained to have the same ORIENT. The "WFC3-UVIS-MOS-DITH-LINE" pattern has been used to obtain covereage across the gap between the CCDs, but otherwise the point is to maintain the largest area receiving full integration time in each filter. We anticipate using the "multidrizzle" routines for removing cosmic rays and hot pixels. We have made the F467M exposures as long as recommended (half-orbit each), since detector read noise is non-negligible, and to minimize overhead. POS TARG have been used for each of visits 2-6 in order to place the gap between the detectors at slightly different positions for each visit; the same offset is applied to each pattern in a given visit. None. QUASAR ABSORPTION LINES AND IGM 12 false 0.0 0.0 false false false false false SUPPORTED UNIDENTIFIED ULTRAVIOLET EMITTER X-RAY EMITTER OPTICAL EMITTER EMISSION LINE NEBULA This object was generated by the targetselector and retrieved from the 2MASS database. It is a QSO, with V~15.5. HS-1549+1919 J2000 00 00 0.0000 +00 00 0.00 J2000 WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F467M POS-TARG MOSAIC DITHER 2 2.4 WFC3-UVIS-MOS-DITH-LINE false true 0.119 2 85.754 POS-TARG WFC3-UVIS-MOS-DITH-LINE 33.606 1 true Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /Users/ccs/OP-cache/q1549_phase2_v3-v01.xml (Tic-Visit :proposal-id 11638 :visit-id "01" :proposal-version -1 :trans-version "20080609" :date "27-Jun-2008 04:17:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3464944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11638 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11638 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2924 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "01" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "01" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "01" :orbit-number 4 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "01" :orbit-number 5 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 5 0 Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /Users/ccs/OP-cache/q1549_phase2_v3-v02.xml (Tic-Visit :proposal-id 11638 :visit-id "02" :proposal-version -1 :trans-version "20080609" :date "01-Jul-2008 11:02:37.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3464944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11638 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11638 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2924 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "02" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "02" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "02" :orbit-number 4 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "02" :orbit-number 5 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 5 0 Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /Users/ccs/OP-cache/q1549_phase2_v3-v03.xml (Tic-Visit :proposal-id 11638 :visit-id "03" :proposal-version -1 :trans-version "20080609" :date "01-Jul-2008 11:02:41.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3464944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11638 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11638 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2924 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "03" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "03" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "03" :orbit-number 4 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "03" :orbit-number 5 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 5 0 Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /Users/ccs/OP-cache/q1549_phase2_v3-v04.xml (Tic-Visit :proposal-id 11638 :visit-id "04" :proposal-version -1 :trans-version "20080609" :date "01-Jul-2008 15:45:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3464944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11638 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11638 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2924 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "04" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "04" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "04" :orbit-number 4 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "04" :orbit-number 5 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 5 0 Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /Users/ccs/OP-cache/q1549_phase2_v3-v05.xml (Tic-Visit :proposal-id 11638 :visit-id "05" :proposal-version -1 :trans-version "20080609" :date "01-Jul-2008 15:45:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3464944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11638 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11638 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2924 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "05" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "05" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "05" :orbit-number 4 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "05" :orbit-number 5 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 5 0 Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /Users/ccs/OP-cache/q1549_phase2_v3-v06.xml (Tic-Visit :proposal-id 11638 :visit-id "06" :proposal-version -1 :trans-version "20080609" :date "01-Jul-2008 11:02:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3464944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11638 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11638 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2924 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "06" :orbit-number 2 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "06" :orbit-number 3 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "06" :orbit-number 4 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11638 :visit-id "06" :orbit-number 5 :pcs-time 195 :si-vis-utilization 3062 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 5 0