16054( 7) - 30-Jan-2020 19:26:44 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16054 Version: 7 Check-in Time: 30-Jan-2020 19:26:44 STScI Edit Number: 1 Title Mapping HI 21cm emission in Green Pea galaxies ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Nissim Kanekar National Centre for Radio Astrophysics, Y TIFR CoI: Dr. Sangeeta Malhotra NASA Goddard Space Flight Center N CoI: Dr. James Rhoads NASA Goddard Space Flight Center N CoI: Tapasi Ghosh National Centre for Radio Astrophysics, N TIFR CoI: Jayaram Chengalur National Centre for Radio Astrophysics, N TIFR CoI: Huan Yang Carnegie Institution of Washington N CoI: Dr. Santosh Harish Arizona State University N CoI: Mr. John Pharo Arizona State University N ------------------------------------------------------------------------------------ Abstract Green Pea Galaxies are compact, low-mass, extreme starburst systems in the nearby Universe, with strong emission lines that rival the stellar continuum in their total luminosity. Such strong line emission demands vigorous star formation, with characteristic ages of just a few million years for the stellar populations that dominate the optical and UV light. Green Peas are the best analogs of high redshift Lyman-alpha emitting galaxies, with many showing high leakage of ionizing photons. Until recently, little information was available about the neutral gas, the fuel for star formation, in Green Peas. We have now used the Arecibo and Green Bank Telescopes to measure the HI content of a sample of Green Peas. We propose here to use the JVLA to map the HI 21cm emission from six galaxies of our sample, and to also obtain HST-COS FUV spectroscopy covering the Lyman-alpha line and the far-ultraviolet metal lines of five of the six galaxies, to infer the spatial distribution of the HI, and derive the HI column density, filling factor, and kinematics, to understand the conditions that promote Ly-alpha escape. We request 48 JVLA L- band hours in C-array, and seven HST-COS orbits, for this project, including all overheads and calibration. ------------------------------------------------------------------------------------ Observations Description ------------------------ We wish to obtain COS FUV spectra of 6 low-redshift green peas that have detected 21-cm HI radio emission and have no UV spectra covering restframe \lya\ line in the archives. We will use these spectra to characterize \lya\ line emission (where present), \lya\ line absorption, and metal line absorption. These measurements will enable us to measure the \lya\ escape fraction, and to measure the neutral gas column density and covering fraction using multiple tracers. This will enable the \lya\ escape to be compared to the neutral gas supply in a statistically useful sample of Green Peas for the first time. Existing archival data + currently approved observing programs supply 16054( 7) - 30-Jan-2020 19:26:44 - [ 2] another 2 (soon to be 3 objects), which we will include in our analysis for an overall sample of 9 objects. Among the two currently in the archive, all show measurable damped \lya\ absorption, and one shows a strong, narrow \lya\ emission line also. One object has a spectrum taken with G140L which is low enough resolution to preclude robust radiative transfer modelling. ------------------------------------------------------------------------------------ 16054( 7) - 30-Jan-2020 19:26:44 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GP1108+2238 GALAXY, DWARF COMPACT, RA=11H08M38.5000S +/- 0", J2000 V = 17 STARBURST DEC=+22D38'9.78" +/- 0" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 3 GP1302+6534 GALAXY, DWARF COMPACT, RA=13H02M49.2000S +/- 0", J2000 V = 17 STARBURST DEC=+65D34'49.30" +/- 0" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 5 GP1345+442 GALAXY, DWARF COMPACT, RA=13H45M31.5000S +/- 0", J2000 V = 17 STARBURST DEC=+04D42'32.70" +/- 0" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 4 GP1455+3808 GALAXY, DWARF COMPACT, RA=14H55M6.0800S +/- 0", J2000 V = 17 STARBURST DEC=+38D08'16.69" +/- 0" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 16054( 7) - 30-Jan-2020 19:26:44 - [ 4] Visit: 01 Visit Requirements: SCHED 70% 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 GP1108+2238 COS/NUV ACQ/IMA PSA MIRRORA 1 200 S (200 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GP1108+2238 COS/FUV TIME-TA PSA G130M 1222 FP-POS=ALL, BUFFER-TIME=14291 1 500 S G see below (4391 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 | ------------------------------------------------------------------------------------------------------------------------------------ GP1108+2238 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE GP1108+2238 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 1074.0 S G GP1108+2238 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 745.0 S G GP1108+2238 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 2 1286.0 S G GP1108+2238 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 2 1286.0 S G 16054( 7) - 30-Jan-2020 19:26:44 - [ 5] Visit: 03 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 GP1302+6534 COS/NUV ACQ/IMA PSA MIRRORA 1 200 S (200 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GP1302+6534 COS/FUV TIME-TA PSA G130M 1222 FP-POS=ALL, BUFFER-TIME=14291 1 420 S G see below (2048 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 | ------------------------------------------------------------------------------------------------------------------------------------ GP1302+6534 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE GP1302+6534 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 512.0 S G GP1302+6534 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 512.0 S G GP1302+6534 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 512.0 S G GP1302+6534 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 512.0 S G 16054( 7) - 30-Jan-2020 19:26:44 - [ 6] Visit: 04 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 GP1455+3808 COS/NUV ACQ/IMA PSA MIRRORA 1 200 S (200 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GP1455+3808 COS/FUV TIME-TA PSA G130M 1222 FP-POS=ALL, BUFFER-TIME=14291 1 500 S G see below (4703 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 | ------------------------------------------------------------------------------------------------------------------------------------ GP1455+3808 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE GP1455+3808 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 1475.0 S G GP1455+3808 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 N/A G GP1455+3808 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 2 1364.0 S G GP1455+3808 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 2 1364.0 S G 16054( 7) - 30-Jan-2020 19:26:44 - [ 7] Visit: 05 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 GP1345+442 COS/NUV ACQ/IMA PSA MIRRORB 1 200 S (200 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GP1345+442 COS/FUV TIME-TA PSA G130M 1222 FP-POS=ALL, BUFFER-TIME=14291 1 100 S G see below (1707 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 | ------------------------------------------------------------------------------------------------------------------------------------ GP1345+442 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE GP1345+442 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 843.0 S G GP1345+442 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 288.0 S G GP1345+442 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 288.0 S G GP1345+442 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 288.0 S G 16054( 7) - 30-Jan-2020 19:26:44 - [ 8] Summary Form for Proposal 16054 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=14291, FP-POS=ALL ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 70% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORA, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names GP1108+2238, GP1302+6534, GP1345+442, GP1455+3808 ------------------------------------------------------------------------------------------------------------------------------------