13723( 4) - 26-Sep-2014 14:44:58 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13723 Version: 4 Check-in Time: 26-Sep-2014 14:44:58 STScI Edit Number: 2 Title Multiband Observations of a Local Tadpole Galaxy ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Bruce Elmegreen IBM T.J. Watson Research Center Y CoI: Prof. Debra Elmegreen Vassar College N CoI: Dr. Jorge Sanchez Almeida Instituto de Astrofisica de Canarias N CoI: Dr. Casiana Munoz-Tunon Instituto de Astrofisica de Canarias N CoI: Dr. Jairo Mendez-Abreu University of St. Andrews N CoI: Prof. John S. Gallagher III University of Wisconsin - Madison N ------------------------------------------------------------------------------------ Abstract We propose WFC3 broadband and Halpha observations of a local tadpole galaxy with a starburst and low metallicity in the head suggestive of ram pressure triggering from cosmological inflow. Such head-tail structure dominates local ultra-low metallicity Blue Compact Dwarfs and it represents 10% of resolved galaxies in the Hubble UDF. We will identify star clusters and measure their properties, including masses and ages, two-point correlations for position as a function of mass and age, and the cluster mass distribution as a function of age. We will also determine the star formation fraction in clusters. These measurements can suggest definite processes for star formation including the importance of turbulent fragmentation. The presence of a super star cluster, if found, will be a model for the formation of metal-poor globular clusters in high redshift dwarf galaxies, which could have formed in similar conditions. The Halpha observations will also show bright rims and nebular structures down to 10's of pc scales. Such structures can indicate pressure sources and nebular flow directions that allow us to understand gas motions inside the starburst head, including pressurized outflows and cosmological inflows. The head is so bright in Halpha that even if only 25% of the ionizing radiation escapes, an inflowing halo stream as far away as 1' will be ionized sufficiently on the surface for our observations to detect it. Thus the proposed galaxy, Kiso 5639, is a prime laboratory to study processes that may be related to cosmic accretion, starburst conditions in primitive galaxies, and the formation of metal-poor globular clusters. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe one source in two visits with seven total filters: FEC#/UVIS: F225W, F336W, F438W, F547M, F606W F814W and F657N This is an observation of an elongated galaxy with a bright region at one end. We call this bright region the head and the fainter rest of the galaxy, the tail. We expect Halpha emission from a region to the side of the galaxy, just off the bright head part. We expect there to be accreting cosmic gas at this place, and so bright emission of Halpha from the accreting gas. 13723( 4) - 26-Sep-2014 14:44:58 - [ 2] There is also a bright star near the galaxy which we don't care about but which needs to be placed so that neither the diffraction spikes nor the channel leakage will cross the galaxy image. Our constraints therefore are as follows: Visit 1: The uv observations with filters F225W F336W should place the galaxy on chip 2, which is the most sensitive chip for FUV. These filters will be observed with one orbit for each filter and two orbits total in this visit. Visit 2: The other observations can be on chip 1 and in particular, the Halpha observation with F657N, should be on chip 1 so that there is area available near the head part of the galaxy still on chip 2 to see the expected emission there. These filters will be observed with one orbit for F438W and F547M, another orbit for F606W and F814W, and a third orbit for F657N. There are 3 orbits total in this visit. The galaxy should be placed on chips 2 (Visit 1) and 1 (Visit 2), respectively, so that there are at least 2 guide stars in the guide star field of views. This requires the galaxy to be slightly offset from the center of the chip in each case. The orientation of the satellite should be such that the diffraction spikes from the nearby bright star and the channel leakage from the nearby bright star do not cross the galaxy image in any filter. These constrains require two visits, as indicated, and therefore it requires time removed from the beginning of the second visit, which is when filters F437W and F537W will be observed, in order to find the guide stars for a second time. The dithering strategy is as follows: For the FUV filters, F225W and F336W, we will dither in a box "Dither Box" without requiring that the chip gap be filled in. The galaxy avoids the chip gap so this filling in is not necessary. For the next 4 filters: F438W, F547M, F606W, and F814W, the exposure times are shorter for each filter and we will dither with 2 pointings "Dither Line". We cannot dither with more pointings because then the data dump cuts into the observing time. For the 7th filter, F657N, we need to fill in the chip gap since we are looking for extended emission in this region. Thus we want the "Gap Line" dithering pattern, which has 2 pointing with one point on each side of the gap spacing. ------------------------------------------------------------------------------------ 13723( 4) - 26-Sep-2014 14:44:58 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 LEDA-36252-V GALAXY, AMORPHOUS RA=11H41M9.4100S, J2000 V = 17.8 ISIT-1 IRREGULAR, IONIZATION DEC=+32D25'27.21" FRONT, STAR FORMING REGION, STARBURST Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 3 LEDA-36252-V GALAXY, AMORPHOUS RA=11H41M8.7020S, J2000 V = 17.8 ISIT-2 IRREGULAR, IONIZATION DEC=+32D25'40.21" FRONT, STAR FORMING REGION, STARBURST Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 13723( 4) - 26-Sep-2014 14:44:58 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-GAP-LINE WFC3-UVIS-DITHER-LINE Pattern_Purpose MOSAIC DITHER Number_Of_Points 2 2 Point_Spacing 2.414 0.145 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.759 46.84 Angle_Between_Sides Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 5 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 6 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13723( 4) - 26-Sep-2014 14:44:58 - [ 5] 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 LEDA-36252- WFC3/UVI ACCUM UVIS2-FIX F225W FLASH=11 1 633 S GS ACQ SCENARIO BASE1B3; VISIT-1 S see below PATTERN 6 1 (2508 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LEDA-36252- WFC3/UVI ACCUM UVIS2-FIX F336W FLASH=10 1 660 S PATTERN 6 2 VISIT-1 S see below (2624 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-36252-VISIT-1 1 WFC3/UVI ACCUM UVIS2-FI F225W 1 none none none 1 627.0 S S X LEDA-36252-VISIT-1 1 WFC3/UVI ACCUM UVIS2-FI F225W 2 none none none 1 627.0 S S X LEDA-36252-VISIT-1 1 WFC3/UVI ACCUM UVIS2-FI F225W 3 none none none 1 627.0 S S X LEDA-36252-VISIT-1 1 WFC3/UVI ACCUM UVIS2-FI F225W 4 none none none 1 627.0 S S X LEDA-36252-VISIT-1 2 WFC3/UVI ACCUM UVIS2-FI F336W 1 none none none 2 656.0 S S X LEDA-36252-VISIT-1 2 WFC3/UVI ACCUM UVIS2-FI F336W 2 none none none 2 656.0 S S X LEDA-36252-VISIT-1 2 WFC3/UVI ACCUM UVIS2-FI F336W 3 none none none 2 656.0 S S X LEDA-36252-VISIT-1 2 WFC3/UVI ACCUM UVIS2-FI F336W 4 none none none 2 656.0 S S X 13723( 4) - 26-Sep-2014 14:44:58 - [ 6] Visit: 02 Visit Requirements: ORIENT 94D TO 99 D 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-36252- WFC3/UVI ACCUM UVIS1-FIX F438W FLASH=6 1 627 S PATTERN 5 1 VISIT-2 S see below (1248 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LEDA-36252- WFC3/UVI ACCUM UVIS1-FIX F547M FLASH=2 1 627 S PATTERN 5 2 VISIT-2 S see below (1248 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LEDA-36252- WFC3/UVI ACCUM UVIS1-FIX F606W 1 655 S PATTERN 5 3 VISIT-2 S (1310 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LEDA-36252- WFC3/UVI ACCUM UVIS1-FIX F814W 1 655 S PATTERN 5 4 VISIT-2 S (1310 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LEDA-36252- WFC3/UVI ACCUM UVIS1-FIX F657N FLASH=10 1 660 S PATTERN 4 5 VISIT-2 S see below (2624 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-36252-VISIT-2 1 WFC3/UVI ACCUM UVIS1-FI F438W 1 none none none 1 624.0 S S X LEDA-36252-VISIT-2 1 WFC3/UVI ACCUM UVIS1-FI F438W 2 none none none 1 624.0 S S X LEDA-36252-VISIT-2 2 WFC3/UVI ACCUM UVIS1-FI F547M 1 none none none 1 624.0 S S X LEDA-36252-VISIT-2 2 WFC3/UVI ACCUM UVIS1-FI F547M 2 none none none 1 624.0 S S X LEDA-36252-VISIT-2 3 WFC3/UVI ACCUM UVIS1-FI F606W 1 none none none 2 N/A S X LEDA-36252-VISIT-2 3 WFC3/UVI ACCUM UVIS1-FI F606W 2 none none none 2 N/A S X LEDA-36252-VISIT-2 4 WFC3/UVI ACCUM UVIS1-FI F814W 1 none none none 2 N/A S X LEDA-36252-VISIT-2 4 WFC3/UVI ACCUM UVIS1-FI F814W 2 none none none 2 N/A S X LEDA-36252-VISIT-2 5 WFC3/UVI ACCUM UVIS1-FI F657N 1 1 none none 3 656.0 S S X 13723( 4) - 26-Sep-2014 14:44:58 - [ 7] 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-36252-VISIT-2 5 WFC3/UVI ACCUM UVIS1-FI F657N 1 2 none none 3 656.0 S S X LEDA-36252-VISIT-2 5 WFC3/UVI ACCUM UVIS1-FI F657N 2 1 none none 3 656.0 S S X LEDA-36252-VISIT-2 5 WFC3/UVI ACCUM UVIS1-FI F657N 2 2 none none 3 656.0 S S X 13723( 4) - 26-Sep-2014 14:44:58 - [ 8] Summary Form for Proposal 13723 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS1-FIX, UVIS2-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=11, FLASH=2, FLASH=6 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, ORIENT 94D TO 99 D, PATTERN 4 5, PATTERN 5 1, PATTERN 5 2, PATTERN 5 3, PATTERN 5 4, PATTERN 6 1, PATTERN 6 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F225W, F336W, F438W, F547M, F606W, F657N, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names LEDA-36252-VISIT-1, LEDA-36252-VISIT-2 ------------------------------------------------------------------------------------------------------------------------------------