15702( 5) - 17-Apr-2019 21:56:51 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15702 Version: 5 Check-in Time: 17-Apr-2019 21:56:51 STScI Edit Number: 3 Title Is bright galaxy formation different in the epoch of reionization? Confirmation of the brightest candidates at redshift z>8 ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Takahiro Morishita Space Telescope Science Institute Y CoI: Prof. Michele Trenti University of Melbourne N CoI: Dr. Massimo Stiavelli Space Telescope Science Institute N CoI: Prof. Tommaso L. Treu University of California - Los Angeles N CoI: Dr. Austin Thomas Hoag University of California - Los Angeles N ------------------------------------------------------------------------------------ Abstract How did bright galaxies evolve in the early universe? How much did they contribute to cosmic reionization? These questions have been intensively asked in the modern astronomy. Studying galaxy luminosity functions (LFs) over the cosmic time is a key approach for progress before JWST. Recent studies at z>7 reported a possible evidence of deviation from the Schechter form LF, with an excess at the bright end. Indeed, previous spectroscopic confirmation of two very luminous galaxies at z=8.68 and z=11.09 seems to support the argument, and dramatically changed our understanding of the universe and galaxy evolution in the early universe. In this program, we aim at confirmation of 4, very bright, galaxy candidates at z>8, just identified from the Brightest of Reionizing Galaxies (BoRG), a pure-parallel HST observing program, which is acquiring 1000 pure-parallel orbits with WFC3 in cycles 22 and 25. Among all photometric sources collected in 106 independent HST line-of-sights, the four high-quality photometric sources are exceptionally bright (m125=24.1-25.3, or MUV~-23 to -22 if confirmed at z>8). Addition of a single orbit WFC3IR/F098M imaging for each field will significantly improve their photometric redshift estimate, efficiently differentiating if they are genuine high-z galaxies or low-z interlopers. With the redshift confirmation, we will gain insight into the early evolution of galaxy from the shape of refined LFs, as well as construct a promising high-z sample for future spectroscopic observations by JWST. ------------------------------------------------------------------------------------ Observations Description ------------------------ The observations consist of four 1-orbit visits of F098M imaging (4 exposures times 4 fields). We selected 4 13-NSAMP SPARS50 exposures to fill the orbit in each field, using a 4-point minimum box with optimal half-pixel sampling in both x and y. The field centers are matched to previous observations with the same instrument, and so as orientations but are flexible among every 90 degree. ------------------------------------------------------------------------------------ 15702( 5) - 17-Apr-2019 21:56:51 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 1715+0455-18 GALAXY, STARBURST RA=17H15M0.2250S, J2000 V = 35 m125=25.3 (ABmag) 6 DEC=+04D54'55.25" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 1142+2647-11 GALAXY, STARBURST RA=11H42M1.2440S, J2000 V = 35 m125=24.1 (ABmag) 3 DEC=+26D46'45.52" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 3 2229-0945-38 GALAXY, STARBURST RA=22H28M45.6880S, J2000 V = 35 m125=24.9 (ABmag) 0 DEC=-09D45'7.69" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 4 1152+5434-32 GALAXY, STARBURST RA=11H51M49.1110S, J2000 V = 35 m125=24.2 (ABmag) DEC=+54D33'50.10" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 15702( 5) - 17-Apr-2019 21:56:51 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15702( 5) - 17-Apr-2019 21:56:51 - [ 4] Visit: 01 Visit Requirements: ORIENT 184D TO 194 D On Hold Comments: Additional Comments: Orientation and position are specified to match previous observations in each field, but orientation is flexible between every 90 degree. 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 1715+0455-1 WFC3/IR MULTIAC IR F098M NSAMP=13, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 1 86 CUM (2411.751 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 | ------------------------------------------------------------------------------------------------------------------------------------ 1715+0455-186 1 WFC3/IR MULTIAC IR F098M 1 none none none 1 N/A CUM 1715+0455-186 1 WFC3/IR MULTIAC IR F098M 2 none none none 1 N/A CUM 1715+0455-186 1 WFC3/IR MULTIAC IR F098M 3 none none none 1 N/A CUM 1715+0455-186 1 WFC3/IR MULTIAC IR F098M 4 none none none 1 N/A CUM 15702( 5) - 17-Apr-2019 21:56:51 - [ 5] Visit: 02 Visit Requirements: ORIENT 103D TO 113 D On Hold Comments: Additional Comments: Orientation and position are specified to match previous observations in each field, but orientation is flexible between every 90 degree. 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 1142+2647-1 WFC3/IR MULTIAC IR F098M NSAMP=13, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 1 13 CUM (2411.751 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 | ------------------------------------------------------------------------------------------------------------------------------------ 1142+2647-113 1 WFC3/IR MULTIAC IR F098M 1 none none none 1 N/A CUM 1142+2647-113 1 WFC3/IR MULTIAC IR F098M 2 none none none 1 N/A CUM 1142+2647-113 1 WFC3/IR MULTIAC IR F098M 3 none none none 1 N/A CUM 1142+2647-113 1 WFC3/IR MULTIAC IR F098M 4 none none none 1 N/A CUM 15702( 5) - 17-Apr-2019 21:56:51 - [ 6] Visit: 03 Visit Requirements: ORIENT 243D TO 253 D On Hold Comments: Additional Comments: Orientation and position are specified to match previous observations in each field, but orientation is flexible between every 90 degree. 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 2229-0945-3 WFC3/IR MULTIAC IR F098M NSAMP=13, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 1 80 CUM (2411.751 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2229-0945-380 1 WFC3/IR MULTIAC IR F098M 1 none none none 1 N/A CUM 2229-0945-380 1 WFC3/IR MULTIAC IR F098M 2 none none none 1 N/A CUM 2229-0945-380 1 WFC3/IR MULTIAC IR F098M 3 none none none 1 N/A CUM 2229-0945-380 1 WFC3/IR MULTIAC IR F098M 4 none none none 1 N/A CUM 15702( 5) - 17-Apr-2019 21:56:51 - [ 7] Visit: 04 Visit Requirements: ORIENT 356D TO 6 D; ORIENT 86D TO 96 D On Hold Comments: Additional Comments: Orientation and position are specified to match previous observations in each field, but orientation is flexible between every 90 degree. 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 1152+5434-3 WFC3/IR MULTIAC IR F098M NSAMP=14, SAMP-SEQ=SPARS50 1 DEF GS ACQ SCENARIO BASE1B3; 2 CUM (2611.753 PATTERN 1 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ 1152+5434-32 1 WFC3/IR MULTIAC IR F098M 1 none none none 1 N/A CUM 1152+5434-32 1 WFC3/IR MULTIAC IR F098M 2 none none none 1 N/A CUM 1152+5434-32 1 WFC3/IR MULTIAC IR F098M 3 none none none 1 N/A CUM 1152+5434-32 1 WFC3/IR MULTIAC IR F098M 4 none none none 1 N/A CUM 15702( 5) - 17-Apr-2019 21:56:51 - [ 8] Summary Form for Proposal 15702 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=13, NSAMP=14, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, ORIENT 103D TO 113 D, ORIENT 184D TO 194 D, ORIENT 243D TO 253 D, ORIENT 356D TO 6 D, ORIENT 86D TO 96 D, PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F098M ------------------------------------------------------------------------------------------------------------------------------------ Target Names 1142+2647-113, 1152+5434-32, 1715+0455-186, 2229-0945-380 ------------------------------------------------------------------------------------------------------------------------------------