12009( 6) - 10-Feb-2011 12:23:01 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12009 Version: 6 Check-in Time: 10-Feb-2011 12:23:01 STScI Edit Number: 4 Title Anatomy of a merger: the curious case of MACS J0417.5-1154 ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Anja von der Linden Stanford University CoI: Prof. Steven W. Allen Stanford University N CoI: Dr. Marusa Bradac University of California - Davis N CoI: Dr. Glenn Morris Stanford University N CoI: Mr. Doug Applegate Stanford University N CoI: Dr. Harald Ebeling University of Hawaii N CoI: Mr. Evan Million Stanford University N CoI: Dr. Adam Mantz Stanford University N CoI: Mr. Patrick Kelly Stanford University N ------------------------------------------------------------------------------------ Abstract MACS J0417.5-1154 is a remarkable merger of a very massive cluster and a smaller subcluster. A previous 11 ksec Chandra exposure shows the hot gas distribution to appear distinctly comet-like: the peak is centered on the cD galaxy of the main cluster; the tail, however, extends several hundred kpc and encompasses a pair of giant ellipticals. Optical imaging reveals a bridge of intra-cluster light between the three galaxies, strengthening the hypothesis that this is a merger system with a low impact parameter, seen after pericentric passage. The proposed 80 ksec Chandra observation will allow us to map the detailed thermodynamic state of the system, to study how the merging process affects the cluster cores, and investigate the origin and state of the stripped gas in the tail. ------------------------------------------------------------------------------------ Observations Description ------------------------ This is an imaging program of the galaxy cluster MACS J0417.5-1154, with the aim to reconstruct the mass distribution at the core from gravitational lensing. The primary aim is a weak lensing mass reconstruction. For the weak lensing analysis, we will observe the target for 3 orbits with WFC3 in F606W. Each orbit is split into 4 exposures of 596s each. All exposures are dithered along a LINE pattern, aiming to close the chip gap, and achieve 1/2 pixel resolution. Since we effectively have 12 exposures, we observe with CR-SPLIT=NO. MACS J0417.5-1154 is a strong lensing cluster, and in order to identify further multiple image systems, we plan to observe it with a second filter, F814W. Because of its higher throughput, we use ACS for this single-orbit observation. We take 5 exposures along a LINE pattern, again closing the chip gap and aiming for 1/2 pixel resolution. For a high S/N weak lensing mass map and the search for multiple image systems 12009( 6) - 10-Feb-2011 12:23:01 - [ 2] we need the highest depth reachable within the given observing time. Hence we require the LOW-SKY special requirement for the whole program. The orientation constraints and the POS TARG of the ACS observation are chosen to avoid the bright stars in the field. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12009( 6) - 10-Feb-2011 12:23:01 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 MACSJ0417.5- CLUSTER OF GALAXIES, RA=04H17M32.9905S +/- 0.1", J2000 V = 20 1154 GRAVITATIONAL LENS, DEC=-11D54'22.54" +/- 0.1" RICH CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12009( 6) - 10-Feb-2011 12:23:01 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 5 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose DITHER Number_Of_Points 12 Point_Spacing 1.4163 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 93.9 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 10 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 5 Point_Spacing 3.011 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 11 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 1.4163 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 93.9 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12009( 6) - 10-Feb-2011 12:23:01 - [ 5] Visit: 01 Visit Requirements: ORIENT 320.0D TO 353.0 D; ORIENT 136.0D TO 169.0 D; ORIENT 59.0D TO 80.0 D; ORIENT 236.0D TO 260.0 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MACSJ0417.5 WFC3/UVI ACCUM UVIS-CENT F606W CR-SPLIT=NO 1 596 S LOW-SKY; PATTERN 5 1 -1154 S ER ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 3 none none none 1 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 4 none none none 1 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 5 none none none 2 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 6 none none none 2 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 7 none none none 2 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 8 none none none 2 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 9 none none none 3 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 10 none none none 3 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 11 none none none 3 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 12 none none none 3 N/A S TER 12009( 6) - 10-Feb-2011 12:23:01 - [ 6] Visit: 03 Visit Requirements: ORIENT 4.0D TO 34.0 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MACSJ0417.5 ACS/WFC ACCUM WFCENTER F814W CR-SPLIT=NO 1 382 S POS TARG -1154 18.24459605459966, 16.796019159186372; LOW-SKY; PATTERN 10 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACSJ0417.5-1154 1 ACS/WFC ACCUM WFCENTER F814W 1 none none none 1 N/A MACSJ0417.5-1154 1 ACS/WFC ACCUM WFCENTER F814W 2 none none none 1 N/A MACSJ0417.5-1154 1 ACS/WFC ACCUM WFCENTER F814W 3 none none none 1 N/A MACSJ0417.5-1154 1 ACS/WFC ACCUM WFCENTER F814W 4 none none none 1 N/A MACSJ0417.5-1154 1 ACS/WFC ACCUM WFCENTER F814W 5 none none none 1 N/A 12009( 6) - 10-Feb-2011 12:23:01 - [ 7] Visit: 51 Visit Requirements: ORIENT 60.8D TO 60.8 D On Hold Comments: Additional Comments: HOPR repeat of the first three exposures from visit 1. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MACSJ0417.5 WFC3/UVI ACCUM UVIS-CENT F606W CR-SPLIT=NO 1 596 S POS TARG 0, -8.0; -1154 S ER LOW-SKY; GS ACQ SCENARIO BASE1B3 ------------------------------------------------------------------------------------------------------------------------------------ 2 MACSJ0417.5 WFC3/UVI ACCUM UVIS-CENT F606W CR-SPLIT=NO 1 596 S POS TARG 0, -6.25; -1154 S ER LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 3 MACSJ0417.5 WFC3/UVI ACCUM UVIS-CENT F606W CR-SPLIT=NO 1 596 S POS TARG 0, -5.0; -1154 S ER LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER MACSJ0417.5-1154 2 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER MACSJ0417.5-1154 3 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER 12009( 6) - 10-Feb-2011 12:23:01 - [ 8] Visit: 52 Visit Requirements: ORIENT 82D TO 85 D On Hold Comments: Additional Comments: HOPR repeat of the first three exposures from visit 1. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MACSJ0417.5 WFC3/UVI ACCUM UVIS-CENT F606W CR-SPLIT=NO 1 596 S POS TARG -1154 S ER 5.469426498794622, -4.7885870148864385; LOW-SKY; GS ACQ SCENARIO BASE1B3; PATTERN 11 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 1 none none none 1 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 2 none none none 1 N/A S TER MACSJ0417.5-1154 1 WFC3/UVI ACCUM UVIS-CEN F606W 3 none none none 1 N/A S TER 12009( 6) - 10-Feb-2011 12:23:01 - [ 9] Summary Form for Proposal 12009 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, LOW-SKY, ORIENT 136.0D TO 169.0 D, ORIENT 236.0D TO 260.0 D, ORIENT 320.0D TO 353.0 D, ORIENT 4.0D TO 34.0 D, ORIENT 59.0D TO 80.0 D, ORIENT 60.8D TO 60.8 D, ORIENT 82D TO 85 D, PATTERN 10 1, PATTERN 11 1, PATTERN 5 1, POS TARG 0, -5.0, POS TARG 0, -6.25, POS TARG 0, -8.0, POS TARG 18.24459605459966, 16.796019159186372, POS TARG 5.469426498794622, -4.7885870148864385 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names MACSJ0417.5-1154 ------------------------------------------------------------------------------------------------------------------------------------