SPT-CL J0546-5345 galaxy cluster LTM lens model

Galaxy cluster SPT-CL J0546-5345, located at z = 1.07 is one of the most massive galaxy clusters known to date at z > 1. In Allingham et al. 2025, we publish the first recorded lens model of the cluster, using software LTM (Zitrin et al. 2015).

In this repository, we publish in free access the lens model, including the maps of the lensing potential (Psi2), deflection angles (alpha_x, alpha_y), magnification, convergence, shear (Magnification, Kappa, Gamma1 and Gamma2), and associated errors. All values requiring a source redshift (such as Magnification) are computed for a source redshift zs = 3.5, following the 'anchor' redshift described in the article. More magnification maps are available for redshifts zs = 2, 3, 4.5, 6, 9, 10.

We moreover add the SPT-CL J0546-5345 stiff.tif image we used for our LTM run, and a catalogue of RA, Dec coordinates of the multiple images (all 16 systems, including the most likely candidates, see "actcl0546_mulfile_v1.mul"). A catalogue with all known spectroscopic redshifts on the field is also provided. The confidence flag is as follows: "0" for unknown confidence, "3" and "4" for good and very good confience (resp.) and "6" for stars. Moreover, we provide the catalogue of the galaxies 'galaxyfile', including the ACS/F814W magnitude.