13762( 8) - 01-Sep-2015 21:09:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13762 Version: 8 Check-in Time: 01-Sep-2015 21:09:15 STScI Edit Number: 4 Title A powerful starburst at z=5.4 with strong Lyman alpha emission: resolved SED with HST ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ian McGreer University of Arizona Y CoI: Prof. Xiaohui Fan University of Arizona N CoI: Prof. Daniel P. Stark University of Arizona N CoI: Dr. Benjamin Clement Centre de Recherche Astronomique de Lyon N CoI: Prof. Linhua Jiang Peking University N CoI: Dr. Fuyan Bian Australian National University N CoI: Dr. Brenda L. Frye University of Arizona N CoI: Prof. Jean-Paul Kneib Ecole Polytechnique Federale de Lausanne N CoI: Dr. Marceau Limousin Laboratoire d'Astrophysique de Marseille N ------------------------------------------------------------------------------------ Abstract We serendipitously discovered the brightest galaxy known at z>5 as part of a faint quasar survey. LAEJ1414+5446 has extremely strong Lyman alpha emission and a bright stellar continuum, consistent with an unobscured star formation rate of ~300 Msun/yr. This object is uniquely suited for detailed studies of a powerful starburst galaxy near the epoch of reionization. Archival HST snapshot imaging in a single band (blueward of Lyman alpha) shows that the galaxy resolves into multiple emission components on 0.4'' scales. We propose multi-band imaging with ACS/WFC and WFC3/IR in order to fill out the spectral energy distribution (SED) at rest-frame UV wavelengths, while resolving the individual emission clumps. Combined with Spitzer observations, the UV SED will constrain the star formation activity, stellar population age, and dust extinction in an extremely luminous starburst at z>5. We will map the Lyman alpha emission in a narrow band and use SED modeling to estimate the escape fraction of ionizing photons. Constraints on the star formation activity and history of a potentially massive galaxy at z>5 will impact models of galaxy formation during the reionization epoch and provide clues to the star formation activity at higher redshift that is thought to drive reionization. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program will obtain ACS and WFC3 imaging of a bright, high-redshift galaxy with strong Lyman alpha emission. The primary goals are 1) spatially resolve the UV SED of the galaxy from 0.9um to 1.6um, obtaining a measurement of the UV continuum slope; 2) spatially map the strong Lyman alpha emission with a combination of narrow and broad band imaging; 3) obtain high-resolution, high-S/N images of nearby lensed arcs from a lensing group centered ~30" from the high-z galaxy. The ACS orbit is split between the F850LP bandpass to provide a continuum image, and the F792N ramp filter centered on the strong Lyman alpha emission at 7816Ang. The broadband image uses the WFC2-ORAMP aperture to align the pixels 13762( 8) - 01-Sep-2015 21:09:15 - [ 2] between the broad and narrow images. In order to obtain F850LP imaging of the lensed arcs ~30" from the target galaxy, we impose an orientation constraint of 215 degrees to 45 degrees, keeping the cluster center well within the WFC2 chip in the broadband image, while sacrificing only a small amount of visibility. Each filter has a pair of ~600s exposures with the ACS-WFC-DITHER-LINE pattern. The WFC3 orbit is split between F125W and F160W, using a 3-point dither pattern with 10x50s sampling sequence at each dither point. As the galaxy is centered on the chip no orientation restrictions are needed. CALIBRATION ORBITS: As per STScI policy, 4 internal orbits have been added to this proposal for the purpose of obtaining subarray bias frames that are contemporaneous with the science observations. These internal orbits will be charged to STScI's Cycle 22 ACS Calibration Program, not to GO 13762. The ACS Instrument Team at STScI is responsible for producing superbias reference files from the bias frames obtained in this GO proposal. ------------------------------------------------------------------------------------ 13762( 8) - 01-Sep-2015 21:09:15 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 LAEJ1414+544 GALAXY, HIGH REDSHIFT RA=14H14M46.8200S, J2000 i(AB)=23.1 6 GALAXY, LYMAN ALPHA DEC=+54D46'31.90" CLOUD, STARBURST Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13762( 8) - 01-Sep-2015 21:09:15 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 5 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.605 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 8 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 1.265 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 130.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13762( 8) - 01-Sep-2015 21:09:15 - [ 5] Visit: 01 Visit Requirements: ORIENT 90D TO 350 D; GROUP 01, A1, A2, A3, A4 WITHIN 14D 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LAEJ1414+54 ACS/WFC ACCUM WFC2-ORAM FR782N 7816.0 1 271 S (813 GS ACQ SCENARIO BASE1B3; 46 PQ S) PATTERN 8 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 LAEJ1414+54 ACS/WFC ACCUM WFC2-ORAM F850LP 1 337 S PATTERN 8 2 46 P (1011 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LAEJ1414+54 WFC3/IR MULTIAC IR F125W NSAMP=10, SAMP-SEQ=SPARS50 1 DEF PATTERN 5 3 46 CUM (1358.809 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LAEJ1414+54 WFC3/IR MULTIAC IR F160W NSAMP=10, SAMP-SEQ=SPARS50 1 DEF PATTERN 5 4 46 CUM (1358.809 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ LAEJ1414+5446 1 ACS/WFC ACCUM WFC2-ORA FR782N 7816. 1 none none none 1 N/A MPQ 0 LAEJ1414+5446 1 ACS/WFC ACCUM WFC2-ORA FR782N 7816. 2 none none none 1 N/A MPQ 0 LAEJ1414+5446 1 ACS/WFC ACCUM WFC2-ORA FR782N 7816. 3 none none none 1 N/A MPQ 0 LAEJ1414+5446 2 ACS/WFC ACCUM WFC2-ORA F850LP 1 none none none 1 N/A MP LAEJ1414+5446 2 ACS/WFC ACCUM WFC2-ORA F850LP 2 none none none 1 N/A MP LAEJ1414+5446 2 ACS/WFC ACCUM WFC2-ORA F850LP 3 none none none 1 N/A MP LAEJ1414+5446 3 WFC3/IR MULTIAC IR F125W 1 none none none 2 N/A CUM LAEJ1414+5446 3 WFC3/IR MULTIAC IR F125W 2 none none none 2 N/A CUM LAEJ1414+5446 3 WFC3/IR MULTIAC IR F125W 3 none none none 2 N/A CUM LAEJ1414+5446 4 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM LAEJ1414+5446 4 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM 13762( 8) - 01-Sep-2015 21:09:15 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ LAEJ1414+5446 4 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 13762( 8) - 01-Sep-2015 21:09:15 - [ 7] Visit: A1 Visit Requirements: SEQ A1, A2, A3, A4 WITHIN 1 D On Hold Comments: Additional Comments: WFC2-ORAMPQ subarray bias frames charged to Cycle 22 ACS Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 BIAS ACS/WFC ACCUM WFC2-ORAM DEF GAIN=2.0, COMPRESSION=NONE 6 0 S (0 S) PQ ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 1 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 2 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 3 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 4 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 5 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 6 none 1 N/A MPQ 13762( 8) - 01-Sep-2015 21:09:15 - [ 8] Visit: A2 Visit Requirements: On Hold Comments: Additional Comments: WFC2-ORAMPQ subarray bias frames charged to Cycle 22 ACS Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 BIAS ACS/WFC ACCUM WFC2-ORAM DEF GAIN=2.0, COMPRESSION=NONE 6 0 S (0 S) PQ ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 1 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 2 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 3 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 4 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 5 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 6 none 1 N/A MPQ 13762( 8) - 01-Sep-2015 21:09:15 - [ 9] Visit: A3 Visit Requirements: On Hold Comments: Additional Comments: WFC2-ORAMPQ subarray bias frames charged to Cycle 22 ACS Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 BIAS ACS/WFC ACCUM WFC2-ORAM DEF GAIN=2.0, COMPRESSION=NONE 6 0 S (0 S) PQ ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 1 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 2 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 3 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 4 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 5 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 6 none 1 N/A MPQ 13762( 8) - 01-Sep-2015 21:09:15 - [ 10] Visit: A4 Visit Requirements: On Hold Comments: Additional Comments: WFC2-ORAMPQ subarray bias frames charged to Cycle 22 ACS Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 BIAS ACS/WFC ACCUM WFC2-ORAM DEF GAIN=2.0, COMPRESSION=NONE 6 0 S (0 S) PQ ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 1 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 2 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 3 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 4 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 5 none 1 N/A MPQ BIAS 1 ACS/WFC ACCUM WFC2-ORA DEF none none 6 none 1 N/A MPQ 13762( 8) - 01-Sep-2015 21:09:15 - [ 11] Summary Form for Proposal 13762 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, WFC2-ORAMP, WFC2-ORAMPQ ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters COMPRESSION=NONE, GAIN=2.0, NSAMP=10, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 01, A1, A2, A3, A4 WITHIN 14D, GS ACQ SCENARIO BASE1B3, ORIENT 90D TO 350 D, PATTERN 5 3, PATTERN 5 4, PATTERN 8 1, PATTERN 8 2, SEQ A1, A2, A3, A4 WITHIN 1 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements DEF, F125W, F160W, F850LP, FR782N ------------------------------------------------------------------------------------------------------------------------------------ Target Names BIAS, LAEJ1414+5446 ------------------------------------------------------------------------------------------------------------------------------------