17890( 2) - 20-Dec-2024 13:12:28 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17890 Version: 2 Check-in Time: 20-Dec-2024 13:12:28 STScI Edit Number: 0 Title The HI properties of low-z Green Pea galaxies ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ 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: Dr. John Pharo Leibniz-Institut für Astrophysik Potsdam N (AIP) CoI: Mr. Archishman Khasnovis National Centre for Radio Astrophysics, N TIFR CoI: Isak Wold Catholic University of America N ------------------------------------------------------------------------------------ Abstract Green Pea galaxies (GPs) are low-mass, extreme starburst systems in the nearby Universe, with powerful emission lines, including forbidden [OIII] lines, that rival the stellar continuum in luminosity. GPs with high values of O32, the ratio of the [OIII]5007 line luminosity to the [OII]3727 line luminosity, are expected to be the best analogs of the high-redshift galaxies that reionized the Universe, with a number of such GPs showing high leakage of ionizing photons. Recent Arecibo and GBT studies have detected 21cm emission from ~60% of the GPs with O32<10, they only obtained 21cm non-detections from GPs with O32>10. We propose to use the VLA to carry out deep 21cm spectroscopy of 8 GPs with z<0.05 and O32>10, to measure their HI masses, HI-to-stellar mass ratios, and HI depletion timescales. We also propose to obtain HST-COS far-UV spectroscopy covering the Lyman-alpha line and the metal lines of four of the 8 GPs, which do not currently have HST-COS spectroscopy, to infer the Ly-alpha escape fraction, the HI column density and the HI filling factor, and compare these to the HI properties inferred from the VLA 21cm images. We request 78 L-band hours in C-array, and four HST-COS orbits for this proposal. ------------------------------------------------------------------------------------ Observations Description ------------------------ One orbit of COS spectroscopy on each of four Green Peas for which VLA time was allocated, and for which no prior COS spectroscopy exists. ------------------------------------------------------------------------------------ 17890( 2) - 20-Dec-2024 13:12:28 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 J0825+1846 GALAXY, DWARF COMPACT, RA=08H25M40.4500S +/- 0", J2000 V = 18.0 EMISSION LINE NEBULA, DEC=+18D46'17.20" +/- 0" STARBURST Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 2 J0942+4110 GALAXY, DWARF COMPACT, RA=09H42M44.2400S +/- 0", J2000 V = 18.0 EMISSION LINE NEBULA, DEC=+41D10'19.30" +/- 0" STARBURST Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 3 J1411+0556 GALAXY, DWARF COMPACT, RA=14H11M13.3900S +/- 0", J2000 V = 18.0 EMISSION LINE NEBULA, DEC=+05D50'35.20" +/- 0" STARBURST Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 4 J1444+0409 GALAXY, DWARF COMPACT, RA=14H44M41.3700S +/- 0", J2000 V = 18.0 EMISSION LINE NEBULA, DEC=+04D09'41.70" +/- 0" STARBURST Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 17890( 2) - 20-Dec-2024 13:12:28 - [ 3] 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 J0825+1846 COS/NUV ACQ/IMA PSA MIRRORA 1 200 S (200 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J0825+1846 COS/FUV TIME-TA PSA G130M 1222 FP-POS=ALL, BUFFER-TIME=14291 1 400 S G (1600 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 | ------------------------------------------------------------------------------------------------------------------------------------ J0825+1846 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J0825+1846 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 N/A G J0825+1846 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 N/A G J0825+1846 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 N/A G J0825+1846 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 N/A G 17890( 2) - 20-Dec-2024 13:12:28 - [ 4] Visit: 02 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 J0942+4110 COS/NUV ACQ/IMA PSA MIRRORA 1 200 S (200 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J0942+4110 COS/FUV TIME-TA PSA G130M 1222 FP-POS=ALL, BUFFER-TIME=14291 1 380 S G see below (1624 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 | ------------------------------------------------------------------------------------------------------------------------------------ J0942+4110 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J0942+4110 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 406.0 S G J0942+4110 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 406.0 S G J0942+4110 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 406.0 S G J0942+4110 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 406.0 S G 17890( 2) - 20-Dec-2024 13:12:28 - [ 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 J1411+0556 COS/NUV ACQ/IMA PSA MIRRORB 1 200 S (200 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J1411+0556 COS/FUV TIME-TA PSA G130M 1222 FP-POS=ALL, BUFFER-TIME=14291 1 397 S G (1588 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1411+0556 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE J1411+0556 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 N/A G J1411+0556 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 N/A G J1411+0556 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 N/A G J1411+0556 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 N/A G 17890( 2) - 20-Dec-2024 13:12:28 - [ 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 J1444+0409 COS/NUV ACQ/IMA PSA MIRRORA 1 200 S (200 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J1444+0409 COS/FUV TIME-TA PSA G130M 1222 FP-POS=ALL, BUFFER-TIME=14291 1 395 S G (1580 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1444+0409 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J1444+0409 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 N/A G J1444+0409 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 N/A G J1444+0409 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 N/A G J1444+0409 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 N/A G 17890( 2) - 20-Dec-2024 13:12:28 - [ 7] Summary Form for Proposal 17890 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 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORA, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names J0825+1846, J0942+4110, J1411+0556, J1444+0409 ------------------------------------------------------------------------------------------------------------------------------------