17311( 7) - 05-Sep-2024 18:28:33 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17311 Version: 7 Check-in Time: 05-Sep-2024 18:28:33 STScI Edit Number: 6 Title Resolving Star Formation At the Star Cluster Scale Down to ~30 pc at z=2.5 ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Matthew Bayliss University of Cincinnati Main Campus Y CoI: Dr. Jane R. Rigby NASA Goddard Space Flight Center N CoI: Prof. Keren Sharon University of Michigan N CoI: Prof. Michael D. Gladders University of Chicago N CoI: Dr. Gourav Khullar University of Washington N CoI: Dr. Keunho J. Kim California Institute of Technology N CoI: Mr. Joshua Aaron Roberson University of Cincinnati Main Campus N CoI: Dr. Michael Florian University of Arizona N CoI: Mr. Alexander Edwin Navarre University of Cincinnati Main Campus N CoI: Dr. T. Emil Rivera-Thorsen Stockholm University N CoI: Dr. Haakon Dahle University of Oslo N CoI: Dr. Katherine E. Whitaker University of Massachusetts - Amherst N CoI: Dr. Guillaume Mahler Universite de Liege N CoI: Dr. Rongmon Bordoloi North Carolina State University N CoI: Ms. Kate Napier University of Michigan N ------------------------------------------------------------------------------------ Abstract Understanding the modes and physical scale of star-formation in the distant universe requires resolved studies of individual star-forming regions and their stellar populations. This is a proposal to use one of the most spectacular strongly lensed galaxies known to spatially resolve the properties of dozens of individual compact, star-forming clumps with physical sizes ~<30 pc at z=2.5. The fortuitous strong lensing configuration of the target system provides a truly unique opportunity to perform a spatially resolved census of the diffuse and clumpy star formation and ionized nebular gas in a lensed starburst galaxy at Cosmic Noon. We will obtain broadband NIRCam imaging and NIRSpec IFU spectroscopy to measure the stellar continuum from 0.13-1.3 microns, and nebular emission lines between 0.3-0.9 microns. Spectroscopy will inform spectral diagnostics of the nebular gas (ionization state, metallicity, dust extinction) and map the velocity structure of the galaxy. The spectroscopy and broadband SEDs will be used to jointly constrain the star formation histories and stellar populations of individual clumps and diffuse star-formation across the galaxy. All of this will be done on spatially resolved scales down to ~<30 pc. These analyses will reveal whether the compact star forming regions are associated with the larger galaxy structure, or if they have different phase space and chemical properties that identify them as proto- or newly formed young globular clusters. This program will unpack the diversity of star-forming structures and star formation histories, including any "pure" single-burst star-forming regions, within a starburst galaxy at z=2.5. ------------------------------------------------------------------------------------ Observations Description ------------------------ 17311( 7) - 05-Sep-2024 18:28:33 - [ 2] This is a joint HST program to obtain UVIS F555W imaging of a strongly lensed galaxy. The total depth is 5 orbits, split into 5 individual single-orbit visits. Each of these visits is to be separated by at least 1 month to produce a dataset to test for variability within the strongly lensed galaxy. The joint JWST proposal requests NIRSPec IFU spectroscopy and NIRCam imaging of a strongly lensed galaxy containing 26 resolved star-forming clumps with physical sizes of ~30-60 pc. The proposed observations (in combination with archival HST imaging) are designed to measure spatially resolved H-alpha nebular emission and broadband spectral energy distributions spanning 0.12-1.3 microns rest-frame. Nebular lines will inform spatially resolved diagnostics of the ionized gas, including the Balmer Decrement, N2/Ha and R23 metallicity proxies, and O3/O2 and O3/Hb ionization parameter measurements. The H-alpha emission line will also be measured with velocity precisions of <30 km/s, informing a high quality velocity map across the entire galaxy, including peculiar velocities of the dozens of individual compact star forming regions. ------------------------------------------------------------------------------------ 17311( 7) - 05-Sep-2024 18:28:33 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SGASJ1110+64 GALAXY, GRAVITATIONAL RA=11H10M19.8996S +/- 0.2", J2000 V = 27.7 +/- 0.1 59 LENS, HIGH REDSHIFT DEC=+64D59'51.85" +/- 0.2" GALAXY, STAR FORMING REGION Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17311( 7) - 05-Sep-2024 18:28:33 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17311( 7) - 05-Sep-2024 18:28:33 - [ 5] Visit: 01 Visit Requirements: 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 SGASJ1110+6 WFC3/UVI ACCUM UVIS2-C1K F555W 1 640 S GS ACQ SCENARIO BASE1BE; 459 S 1C-CTE see below PATTERN 2 1 (2636 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 | ------------------------------------------------------------------------------------------------------------------------------------ SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 1 none none none 1 659.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 2 none none none 1 659.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 3 none none none 1 659.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 4 none none none 1 659.0 S S K1C-CTE 17311( 7) - 05-Sep-2024 18:28:33 - [ 6] Visit: 02 Visit Requirements: AFTER 01 BY 30 D TO 90 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SGASJ1110+6 WFC3/UVI ACCUM UVIS2-C1K F555W 1 659 S GS ACQ SCENARIO BASE1BE; 459 S 1C-CTE (2636 S) PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 1 none none none 1 N/A S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 2 none none none 1 N/A S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 3 none none none 1 N/A S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 4 none none none 1 N/A S K1C-CTE 17311( 7) - 05-Sep-2024 18:28:33 - [ 7] Visit: 03 Visit Requirements: AFTER 02 BY 30 D TO 90 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SGASJ1110+6 WFC3/UVI ACCUM UVIS2-C1K F555W 1 659 S PATTERN 2 1 459 S 1C-CTE see below (2284 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 | ------------------------------------------------------------------------------------------------------------------------------------ SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 1 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 2 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 3 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 4 none none none 1 571.0 S S K1C-CTE 17311( 7) - 05-Sep-2024 18:28:33 - [ 8] Visit: 04 Visit Requirements: AFTER 03 BY 30 D TO 110 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SGASJ1110+6 WFC3/UVI ACCUM UVIS2-C1K F555W 1 659 S GS ACQ SCENARIO BASE1O3; 459 S 1C-CTE see below PATTERN 2 1 (2284 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 | ------------------------------------------------------------------------------------------------------------------------------------ SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 1 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 2 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 3 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 4 none none none 1 571.0 S S K1C-CTE 17311( 7) - 05-Sep-2024 18:28:33 - [ 9] Visit: 05 Visit Requirements: AFTER 04 BY 30 D TO 90 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SGASJ1110+6 WFC3/UVI ACCUM UVIS2-C1K F555W 1 659 S GS ACQ SCENARIO BASE1O3; 459 S 1C-CTE see below PATTERN 2 1 (2284 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 | ------------------------------------------------------------------------------------------------------------------------------------ SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 1 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 2 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 3 none none none 1 571.0 S S K1C-CTE SGASJ1110+6459 1 WFC3/UVI ACCUM UVIS2-C1 F555W 4 none none none 1 571.0 S S K1C-CTE 17311( 7) - 05-Sep-2024 18:28:33 - [ 10] Summary Form for Proposal 17311 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-C1K1C-CTE ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 30 D TO 90 D, AFTER 02 BY 30 D TO 90 D, AFTER 03 BY 30 D TO 110 D, AFTER 04 BY 30 D TO 90 D, GS ACQ SCENARIO BASE1BE, GS ACQ SCENARIO BASE1O3, PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SGASJ1110+6459 ------------------------------------------------------------------------------------------------------------------------------------