10887( 5) - 03/06/07 09:39 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10887 Version: 5 Check-in Time: 06-Mar-2007 14:38:30 STScI Edit Number: 0 Title Stellar Populations in a z=4 Lensed Galaxy with NICMOS ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Andrew Bunker University of Exeter CoI: Dr. Leonidas Moustakas Jet Propulsion Laboratory N ------------------------------------------------------------------------------------ Abstract We propose to use NICMOS on HST to undertake deep high-resolution H-band imaging of a z=4 galaxy, lensed by a rich foreground cluster into highly-magnified arcs 3- 5arcsec in length. By combining this with existing deep K-band imaging from Keck and high-quality archival WFPC2 and ACS data, we can spatially resolve stellar populations along the arcs. The WFPC2 images clearly reveal several bright knots, which may correspond to sites of active star formation. Indeed, our Keck/LRIS spectra (Bunker, Moustakas & Davis 2000) are consistent with OB-star spectral energy distributions in the rest-ultraviolet. However, there are considerable portions of the arcs which appear redder with no Ly-alpha emission, consistent with being post- starburst regions. The sensitivity and resolution afforded by NIC2 is crucial to study the inter-knot flux in H-band (F160W), a goal unachievable from the ground. In conjunction with our deep Keck K' data, NIC2 imaging will straddle the 4000Ang+Balmer break and thus allow us to `age-date' the stellar populations by the inferred amplitude of the break along the transverse extent of the arcs. We can achieve this in 8 orbits, and address whether this star-forming galaxy at z=4 has had extended formation histories - vital for the interpretation of the Lyman Break Galaxies, and their relation to the evolved Extremely Red Objects. ------------------------------------------------------------------------------------ 10887( 5) - 03/06/07 09:39 - [ 2] Observations Description ------------------------ 16 half-orbit NIC2 images with the F160W filter, comprising two visits each of 4 orbits (8 pointings) dithered in a spiral pattern. ORIENT set such that WFPC2 parallels cover some of cluster. Visit 1 has F606W R-band imaging and visit 2 has F814W I-band. Default NIC1 parallels in F160W (visit 1) and F110W (visit 2) included. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10887( 5) - 03/06/07 09:39 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL- GALAXY, LYMAN ALPHA RA=21H53M33.5200S +/- 0.3", J2000 Z = 4.04 V = 24.3+/-0.3 2390LENS- CLOUD, HIGH REDSHIFT DEC=+17D41'58.40" +/- 0.3" Z4.04 GALAXY, GRAVITATIONAL LENS Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. 10887( 5) - 03/06/07 09:39 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type NIC-SPIRAL-DITH Pattern_Purpose DITHER Number_Of_Points 8 Point_Spacing 1.0 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 0.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10887( 5) - 03/06/07 09:39 - [ 5] Visit: 01 Visit Priority: Visit Requirements: SCHED 80%; ORIENT 100.0D TO 240.0 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL-2390L NIC2 MULTIAC NIC2-FIX F160W NSAMP=22,SAMP-SEQ=SPARS64 1 DEF PATTERN 1 1-3; PAR 2-3 ENS-Z4.04 CUM WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ABELL-2390L WFPC2 IMAGE WFALL-FIX F606W CR-SPLIT=NO 1 1000 S ENS-Z4.04 ------------------------------------------------------------------------------------------------------------------------------------ 3 ABELL-2390L NIC1 MULTIAC NIC1-FIX F160W NSAMP=22,SAMP-SEQ=SPARS64 1 DEF ENS-Z4.04 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 1 none none none 1 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 2 none none none 1 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 3 none none none 2 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 4 none none none 2 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 5 none none none 3 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 6 none none none 3 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 7 none none none 4 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 8 none none none 4 N/A 04 CUM ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F606W 1 none none none 1 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F606W 2 none none none 1 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F606W 3 none none none 2 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F606W 4 none none none 2 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F606W 5 none none none 3 N/A 04 X 10887( 5) - 03/06/07 09:39 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F606W 6 none none none 3 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F606W 7 none none none 4 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F606W 8 none none none 4 N/A 04 X ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F160W 1 none none none 1 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F160W 2 none none none 1 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F160W 3 none none none 2 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F160W 4 none none none 2 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F160W 5 none none none 3 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F160W 6 none none none 3 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F160W 7 none none none 4 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F160W 8 none none none 4 N/A 04 CUM 10887( 5) - 03/06/07 09:39 - [ 7] Visit: 02 Visit Priority: Visit Requirements: SCHED 80%; SAME ORIENT AS 01 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL-2390L NIC2 MULTIAC NIC2-FIX F160W NSAMP=22,SAMP-SEQ=SPARS64 1 DEF PATTERN 1 1-3; PAR 2-3 ENS-Z4.04 CUM WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ABELL-2390L WFPC2 IMAGE WFALL-FIX F814W CR-SPLIT=NO 1 1000 S ENS-Z4.04 ------------------------------------------------------------------------------------------------------------------------------------ 3 ABELL-2390L NIC1 MULTIAC NIC1-FIX F110W NSAMP=22,SAMP-SEQ=SPARS64 1 DEF ENS-Z4.04 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 1 none none none 1 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 2 none none none 1 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 3 none none none 2 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 4 none none none 2 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 5 none none none 3 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 6 none none none 3 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 7 none none none 4 N/A 04 CUM ABELL-2390LENS-Z4. 1 NIC2 MULTIAC NIC2-FIX F160W 8 none none none 4 N/A 04 CUM ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F814W 1 none none none 1 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F814W 2 none none none 1 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F814W 3 none none none 2 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F814W 4 none none none 2 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F814W 5 none none none 3 N/A 04 X 10887( 5) - 03/06/07 09:39 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F814W 6 none none none 3 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F814W 7 none none none 4 N/A 04 X ABELL-2390LENS-Z4. 2 WFPC2 IMAGE WFALL-FI F814W 8 none none none 4 N/A 04 X ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F110W 1 none none none 1 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F110W 2 none none none 1 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F110W 3 none none none 2 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F110W 4 none none none 2 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F110W 5 none none none 3 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F110W 6 none none none 3 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F110W 7 none none none 4 N/A 04 CUM ABELL-2390LENS-Z4. 3 NIC1 MULTIAC NIC1-FIX F110W 8 none none none 4 N/A 04 CUM 10887( 5) - 03/06/07 09:39 - [ 9] Summary Form for Proposal 10887 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures NIC2-FIX WFALL-FIX NIC1-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations NIC2 WFPC2 NIC1 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=22 SAMP-SEQ=SPARS64 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 80%; ORIENT 100.0D TO 240.0 D; PATTERN 1 1-3; PAR 2-3 WITH 1; SAME ORIENT AS 01; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W F606W F814W F110W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ABELL-2390LENS-Z4.04 ------------------------------------------------------------------------------------------------------------------------------------