14167( 4) - 22-Sep-2015 16:26:31 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14167 Version: 4 Check-in Time: 22-Sep-2015 16:26:31 STScI Edit Number: 0 Title Draining the Local Void ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Edward J. Shaya University of Maryland Y CoI: Prof. Igor D. Karachentsev Russian Academy of Sciences, Special N Astrophysical Obs. CoI: Dr. Luca Rizzi California Association for Research in N Astronomy (CARA) CoI: Dr. R. Brent Tully University of Hawaii N ------------------------------------------------------------------------------------ Abstract From the theory of the growth of structure it is anticipated that material rushes away from the centers of voids at velocities that depend on the cosmological parameters Omega_m and H_0, how empty the void is, and the radius from the center. If dark energy has a variable equation of state it may pool in voids and add to outflow velocities. The Local Group resides on the boundary of the very large Local Void and it has been determined that we have a peculiar motion of 260 km/s away from the void. Though the Local Void is mostly empty, it does contain a few lonely galaxies. For those that are nearby, accurate distances can be determined from resolved images through identification of the Tip of the Red Giant Branch. Accurate distances allow the determination of accurate peculiar velocities. Serendipidously, one galaxy in the void has been studied and it has a peculiar velocity of 300 km/s away from the void center. An Arecibo Telescope survey recently discovered an excellent target in the Local Void. This interesting galaxy will be studied with this program to afirm if void galaxies systematically have large velocities of expansion from the void center and, incidentally, to investigate the star formation and metallicity properties of this isolated galaxy. The important void expansion test of the theory of the formation of large scale structure can only be made locally, where peculiar velocities dominate Hubble velocities. It is fortuitous that we live adjacent a very large void. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use one orbit to observe KK246 = ESO 461-36 with WFC3/IR in the F110W and F160W filters. We wil observe ALFAZ0AJ1952+1428 with ACS in the F606W filter for two orbits and in the F814W filter for two orbits using a box pattern. ------------------------------------------------------------------------------------ 14167( 4) - 22-Sep-2015 16:26:31 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 ALFAZOAJ1952 GALAXY, DWARF COMPACT RA=19H52M11.8000S +/- 0.1", J2000 V = 22 +1428 DEC=+14D28'24.00" +/- 0.1" Reference Frame: Other: J2000 ------------------------------------------------------------------------------------------------------------------------------------ 2 ESO-461-36 GALAXY, DWARF COMPACT RA=20H03M57.4000S +/- 0.1", J2000 V = 22 DEC=-31D40'53.00" +/- 0.1" Reference Frame: Other: J2000 Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 14167( 4) - 22-Sep-2015 16:26:31 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 5.183 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.859 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 14167( 4) - 22-Sep-2015 16:26:31 - [ 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 ALFAZOAJ195 ACS/WFC ACCUM WFC1 F814W 1 500 S PATTERN 1 1 2+1428 see below (2188 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ALFAZOAJ195 ACS/WFC ACCUM WFC1 F606W 1 0 S PATTERN 1 2 2+1428 see below (2320 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ALFAZOAJ195 ACS/WFC ACCUM WFC1 F814W 1 580 S PATTERN 1 3 2+1428 see below (2320 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ALFAZOAJ195 ACS/WFC ACCUM WFC1 F606W 1 580 S PATTERN 1 4 2+1428 see below (2320 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 | ------------------------------------------------------------------------------------------------------------------------------------ ALFAZOAJ1952+1428 1 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 547.0 S ALFAZOAJ1952+1428 1 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 547.0 S ALFAZOAJ1952+1428 1 ACS/WFC ACCUM WFC1 F814W 3 none none none 1 547.0 S ALFAZOAJ1952+1428 1 ACS/WFC ACCUM WFC1 F814W 4 none none none 1 547.0 S ALFAZOAJ1952+1428 2 ACS/WFC ACCUM WFC1 F606W 1 none none none 2 580.0 S ALFAZOAJ1952+1428 2 ACS/WFC ACCUM WFC1 F606W 2 none none none 2 580.0 S ALFAZOAJ1952+1428 2 ACS/WFC ACCUM WFC1 F606W 3 none none none 2 580.0 S ALFAZOAJ1952+1428 2 ACS/WFC ACCUM WFC1 F606W 4 none none none 2 580.0 S ALFAZOAJ1952+1428 3 ACS/WFC ACCUM WFC1 F814W 1 none none none 3 580 S ALFAZOAJ1952+1428 3 ACS/WFC ACCUM WFC1 F814W 2 none none none 3 580 S ALFAZOAJ1952+1428 3 ACS/WFC ACCUM WFC1 F814W 3 none none none 3 580 S ALFAZOAJ1952+1428 3 ACS/WFC ACCUM WFC1 F814W 4 none none none 3 580 S ALFAZOAJ1952+1428 4 ACS/WFC ACCUM WFC1 F606W 1 none none none 4 580 S ALFAZOAJ1952+1428 4 ACS/WFC ACCUM WFC1 F606W 2 none none none 4 580 S ALFAZOAJ1952+1428 4 ACS/WFC ACCUM WFC1 F606W 3 none none none 4 580 S ALFAZOAJ1952+1428 4 ACS/WFC ACCUM WFC1 F606W 4 none none none 4 580 S 14167( 4) - 22-Sep-2015 16:26:31 - [ 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 ESO-461-36 WFC3/IR MULTIAC IR-FIX F110W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 2 1-2 CUM (1305.876 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ESO-461-36 WFC3/IR MULTIAC IR-FIX F160W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF CUM (1305.876 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 | ------------------------------------------------------------------------------------------------------------------------------------ ESO-461-36 1 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 1 N/A CUM ESO-461-36 1 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 1 N/A CUM ESO-461-36 2 WFC3/IR MULTIAC IR-FIX F160W 1 none none none 1 N/A CUM ESO-461-36 2 WFC3/IR MULTIAC IR-FIX F160W 2 none none none 1 N/A CUM 14167( 4) - 22-Sep-2015 16:26:31 - [ 6] Summary Form for Proposal 14167 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=14, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 1 3, PATTERN 1 4, PATTERN 2 1-2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ALFAZOAJ1952+1428, ESO-461-36 ------------------------------------------------------------------------------------------------------------------------------------