SLICE: SPT-CL J0546-5345 -- A prominent strong-lensing cluster at $z=1.07$
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Allingham, Joseph F. V. Zitrin, Adi Golubchik, Miriam Furtak, Lukas J. Bayliss, Matthew Cerny, Catherine Diego, Jose M. Edge, Alastair C. Gassis, Raven Gladders, Michael D. Jauzac, Mathilde Lagattuta, David J. Leroy, Gavin Limousin, Marceau Mahler, Guillaume Meena, Ashish K. Natarajan, Priyamvada Sharon, Keren |
| author_facet | Allingham, Joseph F. V. Zitrin, Adi Golubchik, Miriam Furtak, Lukas J. Bayliss, Matthew Cerny, Catherine Diego, Jose M. Edge, Alastair C. Gassis, Raven Gladders, Michael D. Jauzac, Mathilde Lagattuta, David J. Leroy, Gavin Limousin, Marceau Mahler, Guillaume Meena, Ashish K. Natarajan, Priyamvada Sharon, Keren |
| contents | Massive galaxy clusters act as prominent strong-lenses. Due to a combination of observational biases, cluster evolution and lensing efficiency, most of the known cluster lenses lie typically at $z_{l}\sim0.2-0.7$, with only a few prominent examples at higher redshifts. Here we report a first strong-lensing analysis of the massive galaxy cluster SPT-CL J0546-5345 at a redshift $z_l=1.07$. This cluster was first detected through the Sunyaev-Zel'dovich effect, with a high estimated mass for its redshift of $M_{200,c} = (7.95 \pm 0.92) \times 10^{14}\,M_{\odot}$. Using recent JWST/NIRCam and archival HST imaging, we identify at least 10 secure and 6 candidate sets of multiply imaged background galaxies, which we use to constrain the mass distribution in the cluster. We derive effective Einstein radii of $θ_{E}= 18.1 \pm 1.8 ''$ for a source at $z_{s}=3$, and $θ_{E}= 27.9 \pm 2.8 ''$ for a source at $z_{s}=9$. The total projected mass within a $200$ kpc radius around the strong-lensing region is $M(<200\,\mathrm{kpc}) = (1.9 \pm 0.3) \times 10^{14}\,M_{\odot}$. While our results rely on photometric redshifts warranting spectroscopic follow-up, this central mass resembles that of the Hubble Frontier Fields clusters - although SPT-CL J0546-5345 is observed when the Universe was $\sim 3-4$ Gyr younger. Amongst the multiply-imaged sources, we identify a hyperbolic-umbilic-like configuration, and, thanks to its point-like morphology, a possible Active Galactic Nucleus (AGN). If confirmed spectroscopically, it will add to just a handful of other quasars and AGN known to be multiply lensed by galaxy clusters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_08949 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | SLICE: SPT-CL J0546-5345 -- A prominent strong-lensing cluster at $z=1.07$ Allingham, Joseph F. V. Zitrin, Adi Golubchik, Miriam Furtak, Lukas J. Bayliss, Matthew Cerny, Catherine Diego, Jose M. Edge, Alastair C. Gassis, Raven Gladders, Michael D. Jauzac, Mathilde Lagattuta, David J. Leroy, Gavin Limousin, Marceau Mahler, Guillaume Meena, Ashish K. Natarajan, Priyamvada Sharon, Keren Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Massive galaxy clusters act as prominent strong-lenses. Due to a combination of observational biases, cluster evolution and lensing efficiency, most of the known cluster lenses lie typically at $z_{l}\sim0.2-0.7$, with only a few prominent examples at higher redshifts. Here we report a first strong-lensing analysis of the massive galaxy cluster SPT-CL J0546-5345 at a redshift $z_l=1.07$. This cluster was first detected through the Sunyaev-Zel'dovich effect, with a high estimated mass for its redshift of $M_{200,c} = (7.95 \pm 0.92) \times 10^{14}\,M_{\odot}$. Using recent JWST/NIRCam and archival HST imaging, we identify at least 10 secure and 6 candidate sets of multiply imaged background galaxies, which we use to constrain the mass distribution in the cluster. We derive effective Einstein radii of $θ_{E}= 18.1 \pm 1.8 ''$ for a source at $z_{s}=3$, and $θ_{E}= 27.9 \pm 2.8 ''$ for a source at $z_{s}=9$. The total projected mass within a $200$ kpc radius around the strong-lensing region is $M(<200\,\mathrm{kpc}) = (1.9 \pm 0.3) \times 10^{14}\,M_{\odot}$. While our results rely on photometric redshifts warranting spectroscopic follow-up, this central mass resembles that of the Hubble Frontier Fields clusters - although SPT-CL J0546-5345 is observed when the Universe was $\sim 3-4$ Gyr younger. Amongst the multiply-imaged sources, we identify a hyperbolic-umbilic-like configuration, and, thanks to its point-like morphology, a possible Active Galactic Nucleus (AGN). If confirmed spectroscopically, it will add to just a handful of other quasars and AGN known to be multiply lensed by galaxy clusters. |
| title | SLICE: SPT-CL J0546-5345 -- A prominent strong-lensing cluster at $z=1.07$ |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2507.08949 |