16294( 2) - 30-Jun-2020 21:30:35 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16294 Version: 2 Check-in Time: 30-Jun-2020 21:30:35 STScI Edit Number: 0 Title Pox 186: A Case of Complete Neutral Gas Blow-Away? ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Nathan Eggen University of Minnesota - Twin Cities Y CoI: Prof. Claudia Scarlata University of Minnesota - Twin Cities Y CoI: Dr. Evan D. Skillman University of Minnesota - Twin Cities N CoI: Dr. Anne Jaskot Williams College N CoI: Dr. Vihang Mehta University of Minnesota - Twin Cities N ------------------------------------------------------------------------------------ Abstract Energetically, it is possible for a starburst in a dwarf galaxy to blow away and completely ionize its ISM, resulting in a very high escape fraction of its ionizing radiation. Finding examples of such galaxies would ease the tension between the energy needed to reionize the universe and the ionizing energy budget available to do so. Pox 186 is an exceptional dwarf galaxy with an active starburst, yet a non-detection in deep 21cm HI observations. Its optical spectrum also shows very highly ionized gas, with an extraordinary [OIII]/[OII] ratio (> 20), and evidence of an 800 km/s outflow. Thus, Pox 186 has many physical properties consistent with those of the Green Pea galaxies - low redshift analogs of the sources responsible for the reionization of the universe. However, Green Peas are dominated by bright star clusters embedded in larger systems many times more massive than the galaxies responsible for reionization. The lower mass of Pox 186 makes it a better match to the high redshift systems. When combined with its close proximity (D~18 Mpc), Pox 186 offers a unique laboratory to study in detail the extreme properties of a galaxy like those responsible for reionization. We will image Pox 186 with both narrow and broadband filters and obtain a UV COS spectrum with the G160M grating. The imaging will allow us to study the ionization structure to confirm the density bounded nature of the galaxy. The UV spectrum will be used to study the structure of the outflow, the stars driving the outflow, and to directly compare what one could learn from a similar unresolved, high redshift system. ------------------------------------------------------------------------------------ Observations Description ------------------------ This project will use 7 orbits for WFC3+UVIS multiband imaging of Pox 186 distributed over 2 visits. Our exposure times are set to detect the surface brightness emission at a distance of 1".0 from the center with a S/N > 3 per resolution element, using the ETC to verify the S/N for each filters listed exposure times. We will image the target in the F225W, F280N, F336W, F373N, F467M, F487N, F502N, F621M, and F658N filters. For all filters we will use a 3 point dithering pattern to sample the PSF and reduce the effect of cosmic rays. To reduce overhead and minimze CTE effects we use the UVIS2-C1K1C-SUB aperture for imaging in all but F280N, F373N, and F487N, and add a POST-FLASH flux to 16294( 2) - 30-Jun-2020 21:30:35 - [ 2] ensure a minimum charge packet of 20 electrons as recommended by the recent White paper. F280N, F373N, and F487N will use the full field of view (aperture UVIS2-C1K1C-CTE) to maximize the number of field stars that will be used to verify the alignment of the filters across the two visits. Four orbits are dedicated to obtaining a deep FUV spectra using COS-G160M with CENWAVE=1533. We used COS ETC to estimate the exposure times for spectroscopic observations based on archival STIS observations (PID:8333) and then estimated the required exosure time to reach a S/N of 10 when binning by two resolution elements. The STIS data were also used to estimate the exposure time for obtaining the ACQ/Image using PSA/MirrorA for the recommended S/N = 20. To best remove the fixed pattern noise we cycle through the 4 FP-POS settings over the four orbits. The Bright Object Tool reports a warning about exceeding the local count rate in the ACQ/Image exposure, but there are no objects are present in the 21.5" field around the target in the archival F336W image. Therefore we ignore this warning. ------------------------------------------------------------------------------------ 16294( 2) - 30-Jun-2020 21:30:35 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 LEDA-46982 GALAXY, DWARF COMPACT, RA=13H25M48.6000S +/- 0.05", J2000 Z = V = 17.43 +/- 0.03 STARBURST DEC=-11D36'38.00" +/- 0.05" 0.0041 Reference Frame: ICRS Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 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 ------------------------------------------------------------------------------------------------------------------------------------ 16294( 2) - 30-Jun-2020 21:30:35 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 16294( 2) - 30-Jun-2020 21:30:35 - [ 5] 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 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F280N FLASH=17 1 1383 S PATTERN 1 1 S 1C-CTE see below (4616 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F621M FLASH=18 1 131 S (393 PATTERN 1 2 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F373N FLASH=17 1 1383 S PATTERN 1 3 S 1C-CTE see below (4596 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F336W FLASH=20 1 130 S (390 PATTERN 1 4 S 1C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEDA-46982 1 WFC3/UVI ACCUM UVIS2-C1 F280N 1 none none none 1 1310.0 S S K1C-CTE LEDA-46982 1 WFC3/UVI ACCUM UVIS2-C1 F280N 2 none none none 1 1310.0 S S K1C-CTE LEDA-46982 1 WFC3/UVI ACCUM UVIS2-C1 F280N 3 none none none 2 1996.0 S S K1C-CTE LEDA-46982 2 WFC3/UVI ACCUM UVIS2-C1 F621M 1 none none none 2 N/A S K1C-SUB LEDA-46982 2 WFC3/UVI ACCUM UVIS2-C1 F621M 2 none none none 2 N/A S K1C-SUB LEDA-46982 2 WFC3/UVI ACCUM UVIS2-C1 F621M 3 none none none 2 N/A S K1C-SUB LEDA-46982 3 WFC3/UVI ACCUM UVIS2-C1 F373N 1 none none none 3 1305.0 S S K1C-CTE LEDA-46982 3 WFC3/UVI ACCUM UVIS2-C1 F373N 2 none none none 3 1306.0 S S K1C-CTE LEDA-46982 3 WFC3/UVI ACCUM UVIS2-C1 F373N 3 none none none 4 1985.0 S S K1C-CTE LEDA-46982 4 WFC3/UVI ACCUM UVIS2-C1 F336W 1 none none none 4 N/A S K1C-SUB LEDA-46982 4 WFC3/UVI ACCUM UVIS2-C1 F336W 2 none none none 4 N/A S K1C-SUB 16294( 2) - 30-Jun-2020 21:30:35 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEDA-46982 4 WFC3/UVI ACCUM UVIS2-C1 F336W 3 none none none 4 N/A S K1C-SUB 16294( 2) - 30-Jun-2020 21:30:35 - [ 7] Visit: 03 (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 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F225W FLASH=19 1 403 S PATTERN 1 1 S 1C-SUB (1209 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F502N FLASH=19 1 348 S PATTERN 1 2 S 1C-SUB (1044 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F467M FLASH=20 1 347 S PATTERN 1 3 S 1C-SUB (1041 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F658N FLASH=19 1 400 S PATTERN 1 4 S 1C-SUB (1200 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LEDA-46982 WFC3/UVI ACCUM UVIS2-C1K F487N FLASH=18 1 824 S PATTERN 1 5 S 1C-CTE (2472 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEDA-46982 1 WFC3/UVI ACCUM UVIS2-C1 F225W 1 none none none 1 N/A S K1C-SUB LEDA-46982 1 WFC3/UVI ACCUM UVIS2-C1 F225W 2 none none none 1 N/A S K1C-SUB LEDA-46982 1 WFC3/UVI ACCUM UVIS2-C1 F225W 3 none none none 1 N/A S K1C-SUB LEDA-46982 2 WFC3/UVI ACCUM UVIS2-C1 F502N 1 none none none 1 N/A S K1C-SUB LEDA-46982 2 WFC3/UVI ACCUM UVIS2-C1 F502N 2 none none none 1 N/A S K1C-SUB LEDA-46982 2 WFC3/UVI ACCUM UVIS2-C1 F502N 3 none none none 1 N/A S K1C-SUB LEDA-46982 3 WFC3/UVI ACCUM UVIS2-C1 F467M 1 none none none 2 N/A S K1C-SUB LEDA-46982 3 WFC3/UVI ACCUM UVIS2-C1 F467M 2 none none none 2 N/A S K1C-SUB LEDA-46982 3 WFC3/UVI ACCUM UVIS2-C1 F467M 3 none none none 2 N/A S K1C-SUB LEDA-46982 4 WFC3/UVI ACCUM UVIS2-C1 F658N 1 none none none 2 N/A S K1C-SUB 16294( 2) - 30-Jun-2020 21:30:35 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEDA-46982 4 WFC3/UVI ACCUM UVIS2-C1 F658N 2 none none none 2 N/A S K1C-SUB LEDA-46982 4 WFC3/UVI ACCUM UVIS2-C1 F658N 3 none none none 2 N/A S K1C-SUB LEDA-46982 5 WFC3/UVI ACCUM UVIS2-C1 F487N 1 none none none 3 N/A S K1C-CTE LEDA-46982 5 WFC3/UVI ACCUM UVIS2-C1 F487N 2 none none none 3 N/A S K1C-CTE LEDA-46982 5 WFC3/UVI ACCUM UVIS2-C1 F487N 3 none none none 3 N/A S K1C-CTE 16294( 2) - 30-Jun-2020 21:30:35 - [ 9] Visit: 04 (COS) 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 LEDA-46982 COS/NUV ACQ/IMA PSA MIRRORA 1 7 S (7 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 LEDA-46982 COS/FUV TIME-TA PSA G160M 1533 FLASH=YES, FP-POS=1, 1 2377 S G BUFFER-TIME=18885 (2377 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LEDA-46982 COS/FUV TIME-TA PSA G160M 1533 FLASH=YES, FP-POS=2, 1 2693 S G BUFFER-TIME=18885 (2693 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LEDA-46982 COS/FUV TIME-TA PSA G160M 1533 FLASH=YES, FP-POS=3, 1 2693 S G BUFFER-TIME=18885 (2693 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LEDA-46982 COS/FUV TIME-TA PSA G160M 1533 FLASH=YES, FP-POS=4, 1 2693 S G BUFFER-TIME=18885 (2693 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 | ------------------------------------------------------------------------------------------------------------------------------------ LEDA-46982 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE LEDA-46982 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A G LEDA-46982 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A G LEDA-46982 4 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 N/A G LEDA-46982 5 COS/FUV TIME-TA PSA G160M 1533 none none none none 4 N/A G 16294( 2) - 30-Jun-2020 21:30:35 - [ 10] Summary Form for Proposal 16294 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA, UVIS2-C1K1C-CTE, UVIS2-C1K1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=18885, FLASH=17, FLASH=18, FLASH=19, FLASH=20, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 1 3, PATTERN 1 4, PATTERN 1 5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F225W, F280N, F336W, F373N, F467M, F487N, F502N, F621M, F658N, G160M, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names LEDA-46982 ------------------------------------------------------------------------------------------------------------------------------------