15427( 4) - 12-Dec-2017 15:43:36 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15427 Version: 4 Check-in Time: 12-Dec-2017 15:43:36 STScI Edit Number: 0 Title Exploring the Nature of Dark Matter Through Near-IR CMD's of LSB Galaxies ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. James M. Schombert University of Oregon Y CoI: Prof. Stacy S. McGaugh Case Western Reserve University N ------------------------------------------------------------------------------------ Abstract The coupling between mass and light (i.e., M/L) is critical to understanding the behavior of dark matter in galaxies, the process of galaxy formation in the LCDM paradigm and cosmology. Our program to understand the missing mass problem in rotating galaxies is highly dependent on using a proper M/L to convert near-IR luminosities into stellar masses (where the baryonic mass of a disk galaxy is primary HI gas mass plus stellar mass). The recently discovered radial acceleration relation (RAR) for disk galaxies correlates the baryonic acceleration with the acceleration due to the total mass (i.e., dark matter). This is the first new scaling relation related to dark matter in over a decade, but depends critically on the value of M/L extracted from population models. This proposal is to measure the near-IR M/L directly in two calibrating galaxies, the LSB dwarfs F575-3 and F615-1, by obtaining a F110W-F160W CMD. The greatest uncertainty in our current stellar population models is the contribution from AGB stars in the low metallicity environment typical to LSB galaxies. These observations will allow us to map, and count, the AGB population (M_F160W > -5). This will also allow us a peek into the star formation history of LSB galaxies between 2 and 8 Gyrs (complimenting H-alpha and UV measurements of the current SFR). These observations are timely in that we have been awarded Director's Discretionary time on Spitzer to complete a full range of imaging from GALEX to Spitzer. The Spitzer data are critical to measuring the near-IR luminosity of galaxies, but lacks the resolution to provide any information about the stars that generate it. ------------------------------------------------------------------------------------ Observations Description ------------------------ We are guided but the successful F110W-F160W CMD's from Dalcanton et al. (2009, see Figure 2 taken directly from their publication). Short exposures of 600 and 900 secs achieved MF160W = -3 for IC2574 which has a distance modulus of 27.7. Our targets are at a distance modulus of 30.0; however, we only need to achieve a depth of -5 for our science 15427( 4) - 12-Dec-2017 15:43:36 - [ 2] goal. Therefore, we need to extend the exposure times by a factor of eight (4, 800 secs in F110W and 7, 200 secs in F160W). F110W and F160W are selected for direct comparison to the ANGST CMD's, over a dozen nearby star-forming dwarfs. As both targets are in the Arecibo declination range, than its orbital visibility is 54 minutes per orbit. Thus, our request for 2x4 orbits. All targets are between 2 to 9 Mpc in distance, which produces a plate scale (on the high end) of 2.3 pc per pixel which was shown in the cycle 20 galaxies to be sucient to resolve small star clusters in the galaxies. CMB distances place them at 7 to 9 Mpc, this is confirmed by their location on various scaling relations. Although in the general direction of Virgo, it is highly unlikely that they are Virgo dwarfs given their position on luminosity versus scalelength diagrams. ------------------------------------------------------------------------------------ 15427( 4) - 12-Dec-2017 15:43:36 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 F575-3 GALAXY, LSB RA=12H55M41.1000S +/- 1", J2000 V = 18 DEC=+19D12'34.30" +/- 1" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 2 F615-1 GALAXY, LSB RA=02H43M25.6800S +/- 1", J2000 V = 17 DEC=+16D43'58.10" +/- 1" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15427( 4) - 12-Dec-2017 15:43:36 - [ 4] 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 F575-3 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SEQ 1-4 NON-INT CUM (702.939 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 F575-3 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 F575-3 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.542, 0.182 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 F575-3 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 CUM (702.939 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 | ------------------------------------------------------------------------------------------------------------------------------------ F575-3 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM F575-3 2 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F575-3 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F575-3 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 15427( 4) - 12-Dec-2017 15:43:36 - [ 5] 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 F575-3 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.339, 0.485; CUM (702.939 SEQ 1-4 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 F575-3 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 1 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 F575-3 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.203, 0.303 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 F575-3 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 CUM (702.939 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 | ------------------------------------------------------------------------------------------------------------------------------------ F575-3 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM F575-3 2 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F575-3 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F575-3 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 15427( 4) - 12-Dec-2017 15:43:36 - [ 6] 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 F575-3 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF POS TARG 1., 1.; SEQ 1-4 CUM (702.939 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 F575-3 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 1 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 F575-3 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.542, 1.182 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 F575-3 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 CUM (702.939 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 | ------------------------------------------------------------------------------------------------------------------------------------ F575-3 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM F575-3 2 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F575-3 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F575-3 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 15427( 4) - 12-Dec-2017 15:43:36 - [ 7] 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 F575-3 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.339, 1.485; CUM (702.939 SEQ 1-4 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 F575-3 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 1 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 F575-3 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF POS TARG -1.203, 1.303 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 F575-3 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 CUM (702.939 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 | ------------------------------------------------------------------------------------------------------------------------------------ F575-3 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM F575-3 2 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F575-3 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F575-3 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 15427( 4) - 12-Dec-2017 15:43:36 - [ 8] 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 F615-1 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SEQ 1-4 NON-INT CUM (702.939 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 F615-1 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 F615-1 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.542, 0.182 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 F615-1 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 CUM (702.939 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 | ------------------------------------------------------------------------------------------------------------------------------------ F615-1 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM F615-1 2 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F615-1 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F615-1 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 15427( 4) - 12-Dec-2017 15:43:36 - [ 9] Visit: 06 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 F615-1 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.339, 0.485; CUM (702.939 SEQ 1-4 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 F615-1 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 1 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 F615-1 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.203, 0.303 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 F615-1 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 CUM (702.939 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 | ------------------------------------------------------------------------------------------------------------------------------------ F615-1 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM F615-1 2 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F615-1 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F615-1 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 15427( 4) - 12-Dec-2017 15:43:36 - [ 10] Visit: 07 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 F615-1 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF POS TARG 1., 1.; SEQ 1-4 CUM (702.939 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 F615-1 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 1 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 F615-1 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.542, 1.182 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 F615-1 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 CUM (702.939 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 | ------------------------------------------------------------------------------------------------------------------------------------ F615-1 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM F615-1 2 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F615-1 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F615-1 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 15427( 4) - 12-Dec-2017 15:43:36 - [ 11] Visit: 08 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 F615-1 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.339, 1.485; CUM (702.939 SEQ 1-4 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 F615-1 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 1 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 F615-1 WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF POS TARG -1.203, 1.303 CUM (652.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 F615-1 WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 CUM (702.939 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 | ------------------------------------------------------------------------------------------------------------------------------------ F615-1 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM F615-1 2 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F615-1 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM F615-1 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 15427( 4) - 12-Dec-2017 15:43:36 - [ 12] Summary Form for Proposal 15427 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=14, NSAMP=15, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements POS TARG -0.203, 0.303, POS TARG -1.203, 1.303, POS TARG 0.339, 0.485, POS TARG 0.542, 0.182, POS TARG 1., 1., POS TARG 1.339, 1.485, POS TARG 1.542, 1.182, SAME POS AS 1, SAME POS AS 3, SEQ 1-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names F575-3, F615-1 ------------------------------------------------------------------------------------------------------------------------------------