16248( 3) - 01-Oct-2020 13:27:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16248 Version: 3 Check-in Time: 01-Oct-2020 13:27:15 STScI Edit Number: 0 Title Testing the Origin and Consequences of Vast Extended Molecular Gas Outside High-Redshift Post-Starburst Galaxies ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Justin Scott Spilker University of Texas at Austin Y CoI: Dr. Rachel Bezanson University of Pittsburgh N CoI: Prof. Jenny Emma Greene Princeton University N CoI: Prof. Mariska Kriek University of California - Berkeley N CoI: Prof. Robert Feldmann Universitat Zurich N CoI: Dr. Desika Narayanan University of Florida N CoI: David Setton University of Pittsburgh N CoI: Ms. Katherine Suess University of California - Berkeley N ------------------------------------------------------------------------------------ Abstract We have discovered spectacular vast molecular gas reservoirs reaching tens of kpc outside of two high-redshift post-starburst galaxies as part of an ongoing ALMA survey of such objects. While the host galaxies are only 3-5kpc in size, nearly half the total molecular gas in each system extends 25-45kpc from the hosts. This discovery was unexpected and both the scale and magnitude of the extended gas features are unprecedented at any redshift. The origin of the highly extended molecular gas we have discovered is unclear, but may be related to AGN outflows, stripped tidal tails, and/or material cooled from hotter circumgalactic gas - the spatial resolution and sensitivity of HST are needed to distinguish which. We propose an efficient, high-impact program using WFC3 G102 slitless spectroscopy and F105W direct imaging to determine the origins of the remarkable gas features and their broader implications for galaxy evolution, including galactic feedback, the formation of extended stellar halos, and circumgalactic metal enrichment. These observations are designed to detect and resolve in-situ star formation within the extended gas features, identify stellar tidal debris and close-in merging companions, and spectroscopically map out the local environment on 1Mpc scales. Together, the combination of direct imaging and slitless spectroscopy can uniquely determine the origin of the incredible molecular gas structures we have found and place this unexpected discovery in broader context. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program will acquire 2 orbits of WFC3/G102 imaging data for each of 2 target z~0.6 post-starburst galaxies. The primay goal is to search for extended H-alpha emission arising from large features seen in CO molecular gas maps of the galaxies that extend out to a few arcsec from the galaxy centers. Observations of each target are split into two visits of a single orbit each. In order to disentangle the possibly-complex Halpha distribution, one visit for each target is requested to have ORIENT FROM 30 to 150degrees compared to the other visit (with unconstrained roll angle). This should enforce a minimum roll 16248( 3) - 01-Oct-2020 13:27:15 - [ 2] angle difference between the two visits of at least 30degrees. We follow the 3D-HST dithering strategy, and take grism data in 4 dither positions per orbit. We use POS-TARG offsets to set the dither positions, using a slightly wider pattern than the default WFC3-IR-DITHER-BOX-MIN since some bad pixels come in clumps. As in 3D-HST, the pattern is: POS-TARG: (0, 0) (1.355, 0.424) (0.881, 1.212) (-0.474, 0.788) pixels: (0, 0) (10.0, 3.5) (6.5, 10.0) (-3.5, 6.5) Each grism position integrates for ~550s using SAMP-SEQ = SPARS50 and NSAMP=12, for a total of ~2200s integration in the grism in each orbit. We use the F098M filter for direct imaging wavelength calibration, taking an image in the first and last dither positions at the beginning and end of the orbit, respectively. The direct imaging exposures are ~130s each using NSAMP=14 and SAMP-SEQ = SPARS10. ------------------------------------------------------------------------------------ 16248( 3) - 01-Oct-2020 13:27:15 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ1448+10 GALAXY, HIGH REDSHIFT RA=14H48M45.9192S, J2000 V = 20.03 10 GALAXY, INTERACTING DEC=+10D10'10.55" GALAXY, TIDAL TAIL Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ2258+23 GALAXY, HIGH REDSHIFT RA=22H58M5.6750S, J2000 V = 20.5 13 GALAXY, INTERACTING DEC=+23D13'16.12" GALAXY, TIDAL TAIL Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 16248( 3) - 01-Oct-2020 13:27:15 - [ 4] Visit: 01 (J1448_orient1) 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 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 F098M NSAMP=14, SAMP-SEQ=SPARS10 1 DEF POS TARG 0, 0 010 CUM (132.945 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0 010 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.355, 0.424 010 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.881, 1.212 010 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.474, 0.788 010 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 F098M NSAMP=14, SAMP-SEQ=SPARS10 1 DEF POS TARG -0.474, 0.788 010 CUM (132.945 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ1448+1010 1 WFC3/IR MULTIAC GRISM102 F098M none none none none 1 N/A CUM 4 SDSSJ1448+1010 2 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ1448+1010 3 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ1448+1010 4 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ1448+1010 5 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ1448+1010 6 WFC3/IR MULTIAC GRISM102 F098M none none none none 1 N/A CUM 4 16248( 3) - 01-Oct-2020 13:27:15 - [ 5] Visit: 02 (J1448_orient2) Visit Requirements: ORIENT 30D TO 150D FROM 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 F098M NSAMP=14, SAMP-SEQ=SPARS10 1 DEF POS TARG 0, 0 010 CUM (132.945 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0 010 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.355, 0.424 010 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.881, 1.212 010 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.474, 0.788 010 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SDSSJ1448+1 WFC3/IR MULTIAC GRISM1024 F098M NSAMP=14, SAMP-SEQ=SPARS10 1 DEF POS TARG -0.474, 0.788 010 CUM (132.945 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ1448+1010 1 WFC3/IR MULTIAC GRISM102 F098M none none none none 1 N/A CUM 4 SDSSJ1448+1010 2 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ1448+1010 3 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ1448+1010 4 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ1448+1010 5 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ1448+1010 6 WFC3/IR MULTIAC GRISM102 F098M none none none none 1 N/A CUM 4 16248( 3) - 01-Oct-2020 13:27:15 - [ 6] Visit: 03 (J2258_orient1) 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 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 F098M NSAMP=14, SAMP-SEQ=SPARS10 1 DEF POS TARG 0, 0 313 CUM (132.945 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0 313 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.355, 0.424 313 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.881, 1.212 313 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.474, 0.788 313 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 F098M NSAMP=14, SAMP-SEQ=SPARS10 1 DEF POS TARG -0.474, 0.788 313 CUM (132.945 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ2258+2313 1 WFC3/IR MULTIAC GRISM102 F098M none none none none 1 N/A CUM 4 SDSSJ2258+2313 2 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ2258+2313 3 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ2258+2313 4 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ2258+2313 5 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ2258+2313 6 WFC3/IR MULTIAC GRISM102 F098M none none none none 1 N/A CUM 4 16248( 3) - 01-Oct-2020 13:27:15 - [ 7] Visit: 04 (J2258_orient2) Visit Requirements: ORIENT 30D TO 150D FROM 03 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 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 F098M NSAMP=14, SAMP-SEQ=SPARS10 1 DEF POS TARG 0, 0 313 CUM (132.945 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0 313 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.355, 0.424 313 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.881, 1.212 313 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.474, 0.788 313 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SDSSJ2258+2 WFC3/IR MULTIAC GRISM1024 F098M NSAMP=14, SAMP-SEQ=SPARS10 1 DEF POS TARG -0.474, 0.788 313 CUM (132.945 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ2258+2313 1 WFC3/IR MULTIAC GRISM102 F098M none none none none 1 N/A CUM 4 SDSSJ2258+2313 2 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ2258+2313 3 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ2258+2313 4 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ2258+2313 5 WFC3/IR MULTIAC GRISM102 G102 none none none none 1 N/A CUM 4 SDSSJ2258+2313 6 WFC3/IR MULTIAC GRISM102 F098M none none none none 1 N/A CUM 4 16248( 3) - 01-Oct-2020 13:27:15 - [ 8] Summary Form for Proposal 16248 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures GRISM1024 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, NSAMP=14, SAMP-SEQ=SPARS10, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 30D TO 150D FROM 01, ORIENT 30D TO 150D FROM 03, POS TARG -0.474, 0.788, POS TARG 0, 0, POS TARG 0.881, 1.212, POS TARG 1.355, 0.424 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F098M, G102 ------------------------------------------------------------------------------------------------------------------------------------ Target Names SDSSJ1448+1010, SDSSJ2258+2313 ------------------------------------------------------------------------------------------------------------------------------------