15671( 4) - 24-Jul-2019 15:31:01 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15671 Version: 4 Check-in Time: 24-Jul-2019 15:31:01 STScI Edit Number: 2 Title Unveiling the Nature of Fossil Groups with XMM-HST II: Reducing Variance ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Renato A. Dupke Eureka Scientific Inc. Y CoI: Yolanda Jimenez-Teja Observatorio Nacional N CoI: Dr. Anton M. Koekemoer Space Telescope Science Institute Y CoI: Mr. Lucas Johnson University of Alabama N CoI: Prof. Jimmy A. Irwin University of Alabama N ------------------------------------------------------------------------------------ Abstract Fossil groups (FGs) present a puzzle to theories of structure formation. Despite the low number of bright galaxies, their high velocity dispersions and high T X seem to indicate cluster-like potential wells. Their measured c200 are high indicating early formation epochs, in contradiction with the observed lack of expected large cool cores. We have proposed a discriminatory test, using the intracluster light to mass ratio (ICLf/M) in FGs, using XMM and HST. The pilot study was successful and suggests that FGs are not merging and show high ICLf/M ratios in comparison to relaxed systems. We propose to increase the sample of bonafide FGs complementing XMM and HST archived observations to account for sample variance, allowing us to reliably constrain their formation mechanisms and ages. ------------------------------------------------------------------------------------ Observations Description ------------------------ We based our estimation of the exposure times on our previous experience with the HST ACS and the CICLE algorithm applied to several clusters including a CLASH clusters and the FG J1007+3800. CICLE only relies on the information contained in the data, studying the 2D distribution of the light and using the change of intensity curvature to determine where the galaxy ends and the ICL starts. For this reason high quality imaging is required, as that of ACS/WFC. We need S/N of ~2.5-3 to obtain results of similar precision (or better) than those we obtained for J1007+3800. To achieve this S/N in the images of these FGs we would repeat the same exposures as with exposures, i.e., 1 orbit with the F435W filter and 2 orbits with the F606W filter. Based on our previous experience we would like to ask to follow the same setup suggested by Dan Coe, i.e., to split in multiple (3 or 4) exposures to help reject cosmic rays in final stacked images. The dithered exposures should also cover the gap between the two ACS detectors. They will also mitigate against bad detector pixels and improve the resolution of stacked (drizzled) images. ------------------------------------------------------------------------------------ 15671( 4) - 24-Jul-2019 15:31:01 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 RXJ1136+0713 CLUSTER OF GALAXIES, RA=11H36M23.7200S, J2000 V = 16.3 +/- 0.2 GROUP, POOR CLUSTER DEC=+07D13'37.52" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 2 RXJ1410+4145 CLUSTER OF GALAXIES, RA=14H10M4.1900S, J2000 V = 15.8 +/- 0.2 GROUP, POOR CLUSTER DEC=+41D45'20.88" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 3 RXJ0856+0553 CLUSTER OF GALAXIES, RA=08H56M40.7200S, J2000 V = 16.3 +/- 0.2 GROUP, INTERACTING DEC=+05D53'47.36" GALAXY, POOR CLUSTER Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15671( 4) - 24-Jul-2019 15:31:01 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 3.058944 Line_Spacing 6.039452 Coordinate_Frame POS-TARG Pattern_Orient 85.329042 Angle_Between_Sides 179.702031 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15671( 4) - 24-Jul-2019 15:31:01 - [ 4] Visit: 01 (RXJ1136) 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 RXJ1136+071 ACS/WFC ACCUM WFC F435W 1 505 S PATTERN 1 1-3 3 (2020 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 RXJ1136+071 ACS/WFC ACCUM WFC F606W 1 509 S 3 (2036 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 RXJ1136+071 ACS/WFC ACCUM WFC F606W 1 509 S 3 (2036 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXJ1136+0713 1 ACS/WFC ACCUM WFC F435W 1 none none none 1 N/A RXJ1136+0713 1 ACS/WFC ACCUM WFC F435W 2 none none none 1 N/A RXJ1136+0713 1 ACS/WFC ACCUM WFC F435W 3 none none none 2 N/A RXJ1136+0713 1 ACS/WFC ACCUM WFC F435W 4 none none none 3 N/A RXJ1136+0713 2 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A RXJ1136+0713 2 ACS/WFC ACCUM WFC F606W 2 none none none 2 N/A RXJ1136+0713 2 ACS/WFC ACCUM WFC F606W 3 none none none 2 N/A RXJ1136+0713 2 ACS/WFC ACCUM WFC F606W 4 none none none 3 N/A RXJ1136+0713 3 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A RXJ1136+0713 3 ACS/WFC ACCUM WFC F606W 2 none none none 2 N/A RXJ1136+0713 3 ACS/WFC ACCUM WFC F606W 3 none none none 3 N/A RXJ1136+0713 3 ACS/WFC ACCUM WFC F606W 4 none none none 3 N/A 15671( 4) - 24-Jul-2019 15:31:01 - [ 5] Visit: 02 (RXJ1410) 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 RXJ1410+414 ACS/WFC ACCUM WFC F435W 1 505 S PATTERN 1 1-3 5 (2020 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 RXJ1410+414 ACS/WFC ACCUM WFC F606W 1 509 S 5 (2036 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 RXJ1410+414 ACS/WFC ACCUM WFC F606W 1 509 S 5 (2036 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXJ1410+4145 1 ACS/WFC ACCUM WFC F435W 1 none none none 1 N/A RXJ1410+4145 1 ACS/WFC ACCUM WFC F435W 2 none none none 1 N/A RXJ1410+4145 1 ACS/WFC ACCUM WFC F435W 3 none none none 2 N/A RXJ1410+4145 1 ACS/WFC ACCUM WFC F435W 4 none none none 3 N/A RXJ1410+4145 2 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A RXJ1410+4145 2 ACS/WFC ACCUM WFC F606W 2 none none none 2 N/A RXJ1410+4145 2 ACS/WFC ACCUM WFC F606W 3 none none none 2 N/A RXJ1410+4145 2 ACS/WFC ACCUM WFC F606W 4 none none none 3 N/A RXJ1410+4145 3 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A RXJ1410+4145 3 ACS/WFC ACCUM WFC F606W 2 none none none 2 N/A RXJ1410+4145 3 ACS/WFC ACCUM WFC F606W 3 none none none 3 N/A RXJ1410+4145 3 ACS/WFC ACCUM WFC F606W 4 none none none 3 N/A 15671( 4) - 24-Jul-2019 15:31:01 - [ 6] Visit: 03 (RXJ0856) 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 RXJ0856+055 ACS/WFC ACCUM WFC F435W 1 505 S PATTERN 1 1-3 3 (2020 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 RXJ0856+055 ACS/WFC ACCUM WFC F606W 1 509 S 3 (2036 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 RXJ0856+055 ACS/WFC ACCUM WFC F606W 1 509 S 3 (2036 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXJ0856+0553 1 ACS/WFC ACCUM WFC F435W 1 none none none 1 N/A RXJ0856+0553 1 ACS/WFC ACCUM WFC F435W 2 none none none 1 N/A RXJ0856+0553 1 ACS/WFC ACCUM WFC F435W 3 none none none 2 N/A RXJ0856+0553 1 ACS/WFC ACCUM WFC F435W 4 none none none 3 N/A RXJ0856+0553 2 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A RXJ0856+0553 2 ACS/WFC ACCUM WFC F606W 2 none none none 2 N/A RXJ0856+0553 2 ACS/WFC ACCUM WFC F606W 3 none none none 2 N/A RXJ0856+0553 2 ACS/WFC ACCUM WFC F606W 4 none none none 3 N/A RXJ0856+0553 3 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A RXJ0856+0553 3 ACS/WFC ACCUM WFC F606W 2 none none none 2 N/A RXJ0856+0553 3 ACS/WFC ACCUM WFC F606W 3 none none none 3 N/A RXJ0856+0553 3 ACS/WFC ACCUM WFC F606W 4 none none none 3 N/A 15671( 4) - 24-Jul-2019 15:31:01 - [ 7] Summary Form for Proposal 15671 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1-3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F435W, F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names RXJ0856+0553, RXJ1136+0713, RXJ1410+4145 ------------------------------------------------------------------------------------------------------------------------------------