14923( 9) - 05-Jun-2017 13:16:49 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14923 Version: 9 Check-in Time: 05-Jun-2017 13:16:49 STScI Edit Number: 1 Title LYCAT - LYman Continuum and Alpha in Tol1214-277 ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Goeran Oestlin Stockholm University Y CoI: Dr. Anne Verhamme Observatoire de Geneve N CoI: Prof. Matthew James Hayes Stockholm University N CoI: Mr. Thoger Emil Rivera-Thorsen Stockholm University N CoI: Dr. Jens Melinder Stockholm University N ------------------------------------------------------------------------------------ Abstract In terms of understanding the output and escape of ionising (Lyman continuum) and Lyman alpha photons from galaxies, Tololo 1214-277 appears to be a unique object in the local universe, and possibly a Rosetta stone for our understanding of how dwarfish galaxies might have contributed to the reionisation of the universe. It is the only object known (from HST/GHRS observations) in the nearby universe to exhibit a symmetric Lyman alpha profile centered on the systemic velocity. This indicates that Lyman alpha has suffered very little scattering implying a low optical depth for Lyman continuum photons. Here we propose to obtain a new COS spectrum with higher spectral resolution, covering Lyman alpha as well as metal absorption lines to map the velocity and structure of the ISM, and imaging in Lyman alpha, Halpha, Hbeta, [OII], and [OIII]. The emission line maps will provide further diagnostics on the escape probability of Lyman continuum photons and pave way for a future direct detection experiment with COS. ------------------------------------------------------------------------------------ Observations Description ------------------------ The program consists of 3 visist, one each with the following instruments: WFC3/UVIS, ACS/SBC and COS. The purpose of the WFC3/UVIS visit is to do broad abnd imaging in the F336W, F439W and F775W filters, and to do emission line imaging in the narrow filters F502N (redshifted H-beta), FQ378N (redshifted[OII]), FQ508N (redshifted [OIII]) and FQ674N (redshifted Halpha). The latter 3 filters are quad filters. All filters use 2 dithered exposures, and post-flashing to reach the minimal recommended background of 12e/pixel. The purpose of the ACS/SBC imaging is to do long-pass imaging in F125LP, F140LP, F150LP and F165LP. The F125LP is crucial as it contains the Lyman-alpha line and by taking the difference between F125LP and F140LP we form an effective narrowband filter for isolating the Lya-line. The F140LP, F150LP and F165LP images sample the continuum longwards of Lyman-alpha. The F125LP and F140LP images are split in two dithered exposures each, while one exposure will be obtained for F150LP and F165LP each. We ask the schedulers to make sure that the SBC was not used or turned on in the preceeding visit (by our or another 14923( 9) - 05-Jun-2017 13:16:49 - [ 2] program) in order to ensure a minimal dark current level. The purpose of the COS visit is to obtain deep G130M spectroscopy. In order to enable an optimum target acquisition, we ask for the COS visit to be put on-hold until at least one week after the UVIS and SBC visits have been obtained. We will use the F140LP and F336W images to interpolate an approximate COS NUV image. Following this, we will be able to use the normal ACQ/IMAGE mode, followed by 4 exposures with G130M at cenwave 1318, using all the 4 FP-POS settings. (Should it not be possible to put the COS visit on hold, the ACQ/IMAGE will have to be preceeded by an ACQ/SEARCH exposure). ------------------------------------------------------------------------------------ 14923( 9) - 05-Jun-2017 13:16:49 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SCHG-1214-27 GALAXY, DWARF COMPACT, RA=12H17M17.0833S +/- 0.9", J2000 V = 17.5 FUV=19.3 mag 7 EMISSION LINE NEBULA, DEC=-28D02'32.74" +/- 0.9" STARBURST Reference Frame: Other: NED Extended: YES Comments: This object was generated by the target selector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 2 SCHG-1214-27 GALAXY, DWARF COMPACT, RA=12H17M17.1710S +/- 0.2", J2000 V = 17.5 FUV=19.3 mag 7-COSPOINT EMISSION LINE NEBULA, DEC=-28D02'31.90" +/- 0.2" STARBURST Reference Frame: ICRS Extended: NO Comments: This target was defined by imaging from this programme ------------------------------------------------------------------------------------------------------------------------------------ 14923( 9) - 05-Jun-2017 13:16:49 - [ 4] Visit: 01 (WFC3) 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 SCHG-1214-2 WFC3/UVI ACCUM UVIS2 F438W FLASH=9 1 375 S (375 POS TARG -32.5, -11.5 77 S S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SCHG-1214-2 WFC3/UVI ACCUM UVIS2 F438W FLASH=9 1 375 S (375 POS TARG -30, -10 77 S S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SCHG-1214-2 WFC3/UVI ACCUM UVIS2 F336W FLASH=11 1 400 S (400 SAME POS AS 2 77 S S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SCHG-1214-2 WFC3/UVI ACCUM UVIS2 F336W FLASH=11 1 400 S (400 SAME POS AS 1 77 S S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SCHG-1214-2 WFC3/UVI ACCUM UVIS2 F775W FLASH=5 1 352 S (352 SAME POS AS 1 77 S S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SCHG-1214-2 WFC3/UVI ACCUM UVIS2 F775W FLASH=7 1 273 S (273 SAME POS AS 2 77 S S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SCHG-1214-2 WFC3/UVI ACCUM UVIS-QUAD FQ674N FLASH=12 1 400 S (400 POS TARG 2.5, 5 77 S -FIX S) ------------------------------------------------------------------------------------------------------------------------------------ 8 SCHG-1214-2 WFC3/UVI ACCUM UVIS-QUAD FQ674N FLASH=12 1 400 S (400 POS TARG 5, 6.5 77 S -FIX S) ------------------------------------------------------------------------------------------------------------------------------------ 9 SCHG-1214-2 WFC3/UVI ACCUM UVIS2 F502N FLASH=10 1 883 S (883 POS TARG -32.5, -11.5 77 S S) ------------------------------------------------------------------------------------------------------------------------------------ 10 SCHG-1214-2 WFC3/UVI ACCUM UVIS2 F502N FLASH=10 1 883 S (883 POS TARG -30, -10 77 S S) ------------------------------------------------------------------------------------------------------------------------------------ 11 SCHG-1214-2 WFC3/UVI ACCUM UVIS-QUAD FQ378N FLASH=11 1 1040 S POS TARG 2.5, 5 77 S -FIX (1040 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 SCHG-1214-2 WFC3/UVI ACCUM UVIS-QUAD FQ378N FLASH=11 1 1048 S POS TARG 5, 6.5 77 S -FIX (1048 S) ------------------------------------------------------------------------------------------------------------------------------------ 13 SCHG-1214-2 WFC3/UVI ACCUM UVIS-QUAD FQ508N FLASH=12 1 350 S (350 POS TARG 0, 5 77 S -FIX S) ------------------------------------------------------------------------------------------------------------------------------------ 14 SCHG-1214-2 WFC3/UVI ACCUM UVIS-QUAD FQ508N FLASH=12 1 140 S (140 POS TARG -2.5, 6.5 77 S -FIX S) ------------------------------------------------------------------------------------------------------------------------------------ 14923( 9) - 05-Jun-2017 13:16:49 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SCHG-1214-277 1 WFC3/UVI ACCUM UVIS2 F438W none none none none 1 N/A S SCHG-1214-277 2 WFC3/UVI ACCUM UVIS2 F438W none none none none 1 N/A S SCHG-1214-277 3 WFC3/UVI ACCUM UVIS2 F336W none none none none 1 N/A S SCHG-1214-277 4 WFC3/UVI ACCUM UVIS2 F336W none none none none 1 N/A S SCHG-1214-277 5 WFC3/UVI ACCUM UVIS2 F775W none none none none 1 N/A S SCHG-1214-277 6 WFC3/UVI ACCUM UVIS2 F775W none none none none 1 N/A S SCHG-1214-277 7 WFC3/UVI ACCUM UVIS-QUA FQ674N none none none none 2 N/A S D-FIX SCHG-1214-277 8 WFC3/UVI ACCUM UVIS-QUA FQ674N none none none none 2 N/A S D-FIX SCHG-1214-277 9 WFC3/UVI ACCUM UVIS2 F502N none none none none 2 N/A S SCHG-1214-277 10 WFC3/UVI ACCUM UVIS2 F502N none none none none 2 N/A S SCHG-1214-277 11 WFC3/UVI ACCUM UVIS-QUA FQ378N none none none none 3 N/A S D-FIX SCHG-1214-277 12 WFC3/UVI ACCUM UVIS-QUA FQ378N none none none none 3 N/A S D-FIX SCHG-1214-277 13 WFC3/UVI ACCUM UVIS-QUA FQ508N none none none none 3 N/A S D-FIX SCHG-1214-277 14 WFC3/UVI ACCUM UVIS-QUA FQ508N none none none none 3 N/A S D-FIX 14923( 9) - 05-Jun-2017 13:16:49 - [ 6] Visit: 02 (SBC) Visit Requirements: On Hold Comments: Additional Comments: Schedulers, please try to ascertain that the SBC was not used in the preceeding visit. 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 SCHG-1214-2 ACS/SBC ACCUM SBC F150LP 1 785 S (785 77 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SCHG-1214-2 ACS/SBC ACCUM SBC F125LP 1 1000 S SHADOW 77 (1000 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SCHG-1214-2 ACS/SBC ACCUM SBC F140LP 1 900 S (900 77 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SCHG-1214-2 ACS/SBC ACCUM SBC F150LP 1 919 S (919 POS TARG 0.35385, 0.3465 77 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SCHG-1214-2 ACS/SBC ACCUM SBC F125LP 1 1000 S SAME POS AS 4; SHADOW 77 (1000 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SCHG-1214-2 ACS/SBC ACCUM SBC F140LP 1 900 S (900 SAME POS AS 4 77 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 | ------------------------------------------------------------------------------------------------------------------------------------ SCHG-1214-277 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SCHG-1214-277 2 ACS/SBC ACCUM SBC F125LP none none none none 1 N/A SCHG-1214-277 3 ACS/SBC ACCUM SBC F140LP none none none none 1 N/A SCHG-1214-277 4 ACS/SBC ACCUM SBC F150LP none none none none 2 N/A SCHG-1214-277 5 ACS/SBC ACCUM SBC F125LP none none none none 2 N/A SCHG-1214-277 6 ACS/SBC ACCUM SBC F140LP none none none none 2 N/A 14923( 9) - 05-Jun-2017 13:16:49 - [ 7] Visit: 03 (COS new) Visit Requirements: ON HOLD On Hold Comments: We request to put COS observations on hold until a minimum of 1 week after delivery of the WFC3/UVIS and ACS/SBC images. These images will be used for optimal target acquisition. Additional Comments: Photometry that guides target acquisition and integration times is done with HST data from visits 01 and 02 from this program. Flux was measured on the brightest UV source in 0.2 arcsec (acquisition) and 1.25 arcsec (spectroscopic observation) apertures, using the F140LP and F336W filters. Then we interpolated (power-law) between the two, to lambda=2300 AA. Fluxes are quoted below. These numbers (and the beta slope) were entered into the acquisition and spectroscopic ETCs. HST Imaging Datasets for Photometry: F140LP 14923 jdew02030 F336W 14923 idew01020 FUV full = 44.741 adu/sec = 1.2138e-15 cgs/AA FUV ACQ = 24.773 adu/sec = 6.7205e-16 cgs/AA Uband full = 190.037 adu/sec = 2.702e-16 cgs/AA Uband ACQ = 114.645 adu/sec = 1.63e-16 cgs/AA Beta full = -1.9093 Beta ACQ = -1.8003 Resulting estimates for COS/NUV: COS/NUV full = 6.386e-16 cgs/AA COS/NUV ACQ = 3.6679e-16 cgs/AA We use 4 different spectral settings to cover all lines of interest and cover the detector gap, but instead of using a single CENWAVE with 4 FP-POS we use two different CENWAVE, each with two FP-POS. 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 SCHG-1214-2 COS/NUV ACQ/IMA PSA MIRRORA 1 22 S (22 77-COSPOINT GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SCHG-1214-2 COS/FUV TIME-TA PSA G130M 1318 FP-POS=1, BUFFER-TIME=5261, 1 1205 S 77-COSPOINT G FLASH=YES (1205 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SCHG-1214-2 COS/FUV TIME-TA PSA G130M 1318 FP-POS=2, BUFFER-TIME=5261, 1 1204 S 77-COSPOINT G FLASH=YES (1204 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SCHG-1214-2 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=5261, 1 1410 S 77-COSPOINT G FLASH=YES (1410 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SCHG-1214-2 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=5261, 1 1409 S 77-COSPOINT G FLASH=YES (1409 S) ------------------------------------------------------------------------------------------------------------------------------------ 14923( 9) - 05-Jun-2017 13:16:49 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SCHG-1214-277-COSPO 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A INT GE SCHG-1214-277-COSPO 2 COS/FUV TIME-TA PSA G130M 1318 none none none none 1 N/A INT G SCHG-1214-277-COSPO 3 COS/FUV TIME-TA PSA G130M 1318 none none none none 1 N/A INT G SCHG-1214-277-COSPO 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A INT G SCHG-1214-277-COSPO 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A INT G 14923( 9) - 05-Jun-2017 13:16:49 - [ 9] Summary Form for Proposal 14923 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA, SBC, UVIS-QUAD-FIX, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC, COS/FUV, COS/NUV, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=5261, FLASH=10, FLASH=11, FLASH=12, FLASH=5, FLASH=7, FLASH=9, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ON HOLD , POS TARG -2.5, 6.5, POS TARG -30, -10, POS TARG -32.5, -11.5, POS TARG 0, 5, POS TARG 0.35385, 0.3465, POS TARG 2.5, 5, POS TARG 5, 6.5, SAME POS AS 1, SAME POS AS 2, SAME POS AS 4, SHADOW ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F125LP, F140LP, F150LP, F336W, F438W, F502N, F775W, FQ378N, FQ508N, FQ674N, G130M, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names SCHG-1214-277, SCHG-1214-277-COSPOINT ------------------------------------------------------------------------------------------------------------------------------------