17593( 5) - 25-Jun-2024 21:31:27 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17593 Version: 5 Check-in Time: 25-Jun-2024 21:31:27 STScI Edit Number: 1 Title Studying a massive galaxy cluster to be used as gravitational lens telescope ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Hans Boehringer Max Planck Institute for Extraterrestrial Y Physics CoI: Gayoung Chon Max-Planck-Institut fur extraterrestrische N Physik CoI: Prof. Adi Zitrin Ben Gurion University of the Negev N CoI: Prof. Richard S. Ellis University College London N CoI: Dr. Nicolas Laporte CNRS, Laboratoire d'Astrophysique de N Marseille ------------------------------------------------------------------------------------ Abstract This is a proposal for re-observation of the cluster RXCJ1317.1-3821 with highly flared observational data from an A-rated proposal in AO20 with an additional request for HST observations. It belongs to a programme granted in AO18 to study the most massive clusters at z=0.25-0.5, ideal gravitational lens candidates - which had no pointed X-ray observations so far. This cluster still has insufficient data for a precise temperature determination. Aiming for a good construction of a lensing model, we require sufficiently good data to characterise its precise mass distribution. For another cluster from this study we obtained HST observations which revealed a spectacular lensed image. The present target is the second most promising lensing candidate and we therefore ask for HST imaing. ------------------------------------------------------------------------------------ Observations Description ------------------------ This observation request is based on an XMM-Newton proposal with jointly allocted HST Time. Massive galaxy clusters are important study objects for Astrophysics and Cosmology. Since they are also very rare objects, the discovery and study of them is very valuable. In our project to complete detailed X-ray observations for X-ray luminous clusters of galaxies we have one last massive cluster (estimated M > 6.4 10e14 Msun) among 119 such objects in the redshift range z = 0.25 to 0.5 which has not been studied before. Massive clusters in this redshift range are the best grvitational lense telescopes for the study of the distant Universe. Because of the importance of these objects, we have requested XMM-Newton observing time to determine its properties, its mass and the mass distribution in the cluster. The latter will allow us to construct a first gravitational lensing model of the cluster and evaluate its efficiency as gravitational lense telescope. To make use of the target as gravitational lense telescope, we have also requested HST observations for this system to detect gravitational lensing features and identify lensed objects. To be able to determine photometric redhsifts for the galaxies in the sky field of the cluster, we requested optical 17593( 5) - 25-Jun-2024 21:31:27 - [ 2] observations with ACS F814W and near infrared observations with WFC3 F110W and 160W. With the obtained data we will be able to detect magnified background galxies up to redshift z = 6 and beyond. The field-of-view of the observations will cover a cluster region of 0.7 Mpc for ACS and 0.5 Mpc for WFC3. This will easily provide a complete coverage of the strong lensing regions of the clusters. ------------------------------------------------------------------------------------ 17593( 5) - 25-Jun-2024 21:31:27 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 RXCJ1317.1-3 CLUSTER OF GALAXIES, RA=13H17M12.1600S, J2000 V = 18.5 +/- 0.5 821 RICH CLUSTER DEC=-38D21'55.50" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17593( 5) - 25-Jun-2024 21:31:27 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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 NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 3.034 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17593( 5) - 25-Jun-2024 21:31:27 - [ 5] Visit: 01 (RXCJ1317) 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 RXCJ1317.1- WFC3/IR MULTIAC IR-FIX F110W SAMP-SEQ=SPARS100, NSAMP=7 1 DEF PATTERN 1 1-2 3821 CUM (1205.868 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 RXCJ1317.1- WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS100, NSAMP=7 1 DEF 3821 CUM (1205.868 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 RXCJ1317.1- ACS/WFC ACCUM WFC F814W 1 1150 S PATTERN 2 3 3821 see below (2276 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXCJ1317.1-3821 1 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 1 N/A CUM RXCJ1317.1-3821 1 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 1 N/A CUM RXCJ1317.1-3821 2 WFC3/IR MULTIAC IR-FIX F160W 1 none none none 1 N/A CUM RXCJ1317.1-3821 2 WFC3/IR MULTIAC IR-FIX F160W 2 none none none 1 N/A CUM RXCJ1317.1-3821 3 ACS/WFC ACCUM WFC F814W 1 none none none 2 1138.0 S RXCJ1317.1-3821 3 ACS/WFC ACCUM WFC F814W 2 none none none 2 1138.0 S 17593( 5) - 25-Jun-2024 21:31:27 - [ 6] Summary Form for Proposal 17593 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=7, SAMP-SEQ=SPARS100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1-2, PATTERN 2 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names RXCJ1317.1-3821 ------------------------------------------------------------------------------------------------------------------------------------