Studying a massive galaxy cluster to be used as gravitational lens telescope

Science Keywords: Select from 2 to 5 items. 0 Assigned ID: 4947 ----- Attempting Submission 1 (Mon Dec 18 18:38:24 GMT 2023) ----- Joint XMM I have made the suggested changes for instriument parameters for the IR observations from STEP200 to SPARS200 - now to SPAR100, NSMP=7 665805893 ----- Attempting Submission 1 (Fri Jan 19 09:38:23 GMT 2024) ----- HST Phase II Proposal 17593 successfully submitted. Receipt: # 17593-1 ----- Attempting Submission 2 (Mon Feb 05 14:45:03 GMT 2024) ----- HST Phase II Proposal 17593 successfully submitted. Receipt: # 17593-2 ----- Attempting Submission 3 (Tue Feb 06 08:45:11 GMT 2024) ----- Studying a massive galaxy cluster to be used as gravitational lens telescope 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. 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 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. na Galaxies 6 false false false false false false false false SUPPORTED CLUSTER OF GALAXIES RICH CLUSTER This object was generated by the targetselector and retrieved from the SIMBAD database. MCXM-J1317.1-3821 J2000 J2000 ACS/WFC Imaging No No F814W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W POS-TARG DITHER DITHER 4 5.183 WFC3-IR-DITHER-BOX-MIN false 74.653 false 0.365 0.572 2 41.859 POS-TARG WFC3-IR-DITHER-BLOB 18.528 1

false

POS-TARG DITHER 3.034 LINE false false 2 85.29 ACS-WFC-DITHER-LINE 2

false

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