13294( 4) - 13-Dec-2013 11:24:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13294 Version: 4 Check-in Time: 13-Dec-2013 11:24:15 STScI Edit Number: 0 Title Characterizing the formation of the primordial red sequence ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Alexander Karim Universitat Bonn, Argelander Institute for Y Astronomy CoI: Dr. Peter Capak California Institute of Technology N CoI: Dr. Sune Toft University of Copenhagen, Niels Bohr N Institute CoI: Dr. Vernesa Smolcic University of Zagreb N CoI: Dr. Eva Schinnerer Max-Planck-Institut fur Astronomie, N Heidelberg CoI: Dr. Chris Carilli Associated Universities, Inc. N CoI: Dr. Dominik A. Riechers Cornell University N CoI: Dr. Andrew Zirm University of Copenhagen, Niels Bohr N Institute CoI: Dr. Anton M. Koekemoer Space Telescope Science Institute N CoI: Dr. Manuel A Aravena European Southern Observatory - Chile N CoI: Dr. Kartik Sheth National Radio Astronomical Observatory N CoI: Prof. Frank Bertoldi Universitat Bonn, Argelander Institute for N Astronomy CoI: Dr. Mark Swinbank University of Durham N CoI: Dr. Ian R. Smail University of Durham N CoI: Dr. Eelco van Kampen European Southern Observatory - Germany N CoI: Dr. Michal Michalowski Royal Observatory Edinburgh N CoI: Dr. Johannes G. Staguhn The Johns Hopkins University N ------------------------------------------------------------------------------------ Abstract We request six orbits of HST/WFC3-IR to complement existing CANDELS imaging for a detailed and direct study of the formation properties of the very first massive red sequence galaxies. Our unique sample of millimeter-identified starbursts with spectroscopically confirmed redshifts z>4 is the prime testbed to probe the formation process of massive galaxies in the very early Universe. Given the complicated selection methods to reveal such sources, only recently the vast multi-wavelength coverage of the COSMOS field has allowed to establish this uniquely representative sample of the earliest population of massive starbursts. Their number density has been shown to match that of the very early (z~2) red sequence of massive and intriguingly compact galaxies, hinting to a direct evolutionary link of both populations. In order to establish this link -- particularly that our starbursts are prone to produce a compact remnant -- we need to thoroughly probe both, the heavily obscured regions within these generally dust-rich sources as well as the relatively unobscured patches. Scheduled high-resolution ALMA observations will yield detailed dynamics and direct views of the dust distribution within our targets. However, the high resolution WFC3-IR reaches at rest-frame (near) ultraviolet wavelengths is the only way to allow for a 13294( 4) - 13-Dec-2013 11:24:15 - [ 2] full view of the star formation activity and, for determining the detailed dust extinction processes across our targets. The combined data will yield a unique opportunity to understand massive galaxy formation and dust accumulation within 1.5 Billion years after the Big Bang. ------------------------------------------------------------------------------------ Observations Description ------------------------ We have been granted six orbits for continuum imaging of three redshift z>4 starburst galaxies within the COSMOS field using WFC3's IR channel. One orbit per target will be used for each F125W and F160W filters. Hence, we are planning three visits, one per target, within which each of the two orbits is assigned one particular filter. We use the IR dither-blob pattern with default shifts of a few arcseconds combined with the dither-line IR sub-pattern to allow for sub-pixel shifts, which should be sufficient to move detector defects and persistence from bright sources around the chip by enough to allow them to be dealt with when combining the images. This way, we can split the observations into four exposures per orbit -- matching for both filters -- whereby each exposure takes about 600s. Using the SPARS50 read out sequence we can incorporate 14-15 samples to make the best use of our visibility coverage. We checked the DSS images for nearby bright stars and constrain the rolling range in order to avoid detector saturation. We checked that this constraint does not affect our overall target visibility. We use the IR-fix aperture, centered on the location of our targets, allowing for best coverage of our objects of interest and also obtain a representative sampling of their environment. The absolute astrometric frame in the COSMOS field is tied to the VLA radio observations so that we are not worried about incompatibilities with respect to the global ICRS standard. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13294( 4) - 13-Dec-2013 11:24:15 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 J1000+0234 GALAXY, HIGH REDSHIFT RA=10H00M54.5160S, J2000 H=23.6 GALAXY, STARBURST, DEC=+02D34'35.17" ULTRALUMINOUS IR GAL Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 VD-17871 GALAXY, HIGH REDSHIFT RA=10H01M27.0790S, J2000 H=25.2 GALAXY, STARBURST, DEC=+02D08'55.80" ULTRALUMINOUS IR GAL Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 3 AZTEC-1 GALAXY, HIGH REDSHIFT RA=09H59M42.8590S, J2000 H=24.4 GALAXY, STARBURST, DEC=+02D29'38.20" ULTRALUMINOUS IR GAL Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13294( 4) - 13-Dec-2013 11:24:15 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 5.183 0.636 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 41.788 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 13294( 4) - 13-Dec-2013 11:24:15 - [ 5] Visit: 01 Visit Requirements: BEFORE 03-JUN-2014:00:00:00 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 J1000+0234 WFC3/IR MULTIAC IR-FIX F125W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 1-3; PAR 3 CUM (2611.753 WITH 1-2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 J1000+0234 WFC3/IR MULTIAC IR-FIX F160W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF CUM (2811.738 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY ACS/WFC ACCUM WFC F814W 1 1000 S see below (5066 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1000+0234 1 WFC3/IR MULTIAC IR-FIX F125W 1 1 none none 1 N/A CUM J1000+0234 1 WFC3/IR MULTIAC IR-FIX F125W 1 2 none none 1 N/A CUM J1000+0234 1 WFC3/IR MULTIAC IR-FIX F125W 2 1 none none 2 N/A CUM J1000+0234 1 WFC3/IR MULTIAC IR-FIX F125W 2 2 none none 2 N/A CUM J1000+0234 2 WFC3/IR MULTIAC IR-FIX F160W 1 1 none none 1 N/A CUM J1000+0234 2 WFC3/IR MULTIAC IR-FIX F160W 1 2 none none 1 N/A CUM J1000+0234 2 WFC3/IR MULTIAC IR-FIX F160W 2 1 none none 2 N/A CUM J1000+0234 2 WFC3/IR MULTIAC IR-FIX F160W 2 2 none none 2 N/A CUM ANY 3 ACS/WFC ACCUM WFC F814W 1 1 none none 1 1205.0 S ANY 3 ACS/WFC ACCUM WFC F814W 1 2 none none 1 1287.0 S ANY 3 ACS/WFC ACCUM WFC F814W 2 1 none none 2 1287.0 S ANY 3 ACS/WFC ACCUM WFC F814W 2 2 none none 2 1287.0 S 13294( 4) - 13-Dec-2013 11:24:15 - [ 6] 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 VD-17871 WFC3/IR MULTIAC IR-FIX F125W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 1-3; PAR 3 CUM (2611.753 WITH 1-2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VD-17871 WFC3/IR MULTIAC IR-FIX F160W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF CUM (2811.738 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY ACS/WFC ACCUM WFC F814W 1 1000 S see below (5066 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 | ------------------------------------------------------------------------------------------------------------------------------------ VD-17871 1 WFC3/IR MULTIAC IR-FIX F125W 1 1 none none 1 N/A CUM VD-17871 1 WFC3/IR MULTIAC IR-FIX F125W 1 2 none none 1 N/A CUM VD-17871 1 WFC3/IR MULTIAC IR-FIX F125W 2 1 none none 2 N/A CUM VD-17871 1 WFC3/IR MULTIAC IR-FIX F125W 2 2 none none 2 N/A CUM VD-17871 2 WFC3/IR MULTIAC IR-FIX F160W 1 1 none none 1 N/A CUM VD-17871 2 WFC3/IR MULTIAC IR-FIX F160W 1 2 none none 1 N/A CUM VD-17871 2 WFC3/IR MULTIAC IR-FIX F160W 2 1 none none 2 N/A CUM VD-17871 2 WFC3/IR MULTIAC IR-FIX F160W 2 2 none none 2 N/A CUM ANY 3 ACS/WFC ACCUM WFC F814W 1 1 none none 1 1205.0 S ANY 3 ACS/WFC ACCUM WFC F814W 1 2 none none 1 1287.0 S ANY 3 ACS/WFC ACCUM WFC F814W 2 1 none none 2 1287.0 S ANY 3 ACS/WFC ACCUM WFC F814W 2 2 none none 2 1287.0 S 13294( 4) - 13-Dec-2013 11:24:15 - [ 7] 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 AZTEC-1 WFC3/IR MULTIAC IR-FIX F125W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 1-3; PAR 3 CUM (2611.753 WITH 1-2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AZTEC-1 WFC3/IR MULTIAC IR-FIX F160W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF CUM (2811.738 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ANY ACS/WFC ACCUM WFC F814W 1 1000 S see below (5066 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 | ------------------------------------------------------------------------------------------------------------------------------------ AZTEC-1 1 WFC3/IR MULTIAC IR-FIX F125W 1 1 none none 1 N/A CUM AZTEC-1 1 WFC3/IR MULTIAC IR-FIX F125W 1 2 none none 1 N/A CUM AZTEC-1 1 WFC3/IR MULTIAC IR-FIX F125W 2 1 none none 2 N/A CUM AZTEC-1 1 WFC3/IR MULTIAC IR-FIX F125W 2 2 none none 2 N/A CUM AZTEC-1 2 WFC3/IR MULTIAC IR-FIX F160W 1 1 none none 1 N/A CUM AZTEC-1 2 WFC3/IR MULTIAC IR-FIX F160W 1 2 none none 1 N/A CUM AZTEC-1 2 WFC3/IR MULTIAC IR-FIX F160W 2 1 none none 2 N/A CUM AZTEC-1 2 WFC3/IR MULTIAC IR-FIX F160W 2 2 none none 2 N/A CUM ANY 3 ACS/WFC ACCUM WFC F814W 1 1 none none 1 1205.0 S ANY 3 ACS/WFC ACCUM WFC F814W 1 2 none none 1 1287.0 S ANY 3 ACS/WFC ACCUM WFC F814W 2 1 none none 2 1287.0 S ANY 3 ACS/WFC ACCUM WFC F814W 2 2 none none 2 1287.0 S 13294( 4) - 13-Dec-2013 11:24:15 - [ 8] Summary Form for Proposal 13294 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=14, NSAMP=8, SAMP-SEQ=SPARS100, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 03-JUN-2014:00:00:00, PAR 3 WITH 1-2, PATTERN 1 1-3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F125W, F160W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, AZTEC-1, J1000+0234, VD-17871 ------------------------------------------------------------------------------------------------------------------------------------