J1721+8842: The first Einstein zig-zag lens
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Dux, F. Millon, M. Lemon, C. Schmidt, T. Courbin, F. Shajib, A. J. Treu, T. Birrer, S. Wong, K. C. Agnello, A. Andrade, A. Galan, A. A. Hjorth, J. Paic, E. Schuldt, S. Schweinfurth, A. Sluse, D. Smette, A. Suyu, S. H. |
| author_facet | Dux, F. Millon, M. Lemon, C. Schmidt, T. Courbin, F. Shajib, A. J. Treu, T. Birrer, S. Wong, K. C. Agnello, A. Andrade, A. Galan, A. A. Hjorth, J. Paic, E. Schuldt, S. Schweinfurth, A. Sluse, D. Smette, A. Suyu, S. H. |
| contents | We report the discovery of the first example of an Einstein zig-zag lens, an extremely rare lensing configuration. In this system, J1721+8842, six images of the same background quasar are formed by two intervening galaxies, one at redshift $z_1 = 0.184$ and a second one at $z_2 = 1.885$. Two out of the six multiple images are deflected in opposite directions as they pass the first lens galaxy on one side, and the second on the other side -- the optical paths forming zig-zags between the two deflectors. In this letter, we demonstrate that J1721+8842, previously thought to be a lensed dual quasar, is in fact a compound lens with the more distant lens galaxy also being distorted as an arc by the foreground galaxy. Evidence supporting this unusual lensing scenario includes: 1- identical light curves in all six lensed quasar images obtained from two years of monitoring at the Nordic Optical Telescope; 2- detection of the additional deflector at redshift $z_2 = 1.885$ in JWST/NIRSpec IFU data; and 3- a multiple-plane lens model reproducing the observed image positions. This unique configuration offers the opportunity to combine two major lensing cosmological probes: time-delay cosmography and dual source-plane lensing since J1721+8842 features multiple lensed sources forming two distinct Einstein radii of different sizes, one of which being a variable quasar. We expect tight constraints on the Hubble constant and the equation of state of dark energy by combining these two probes on the same system. The $z_2 = 1.885$ deflector, a quiescent galaxy, is also the highest-redshift strong galaxy-scale lens with a spectroscopic redshift measurement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_04177 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | J1721+8842: The first Einstein zig-zag lens Dux, F. Millon, M. Lemon, C. Schmidt, T. Courbin, F. Shajib, A. J. Treu, T. Birrer, S. Wong, K. C. Agnello, A. Andrade, A. Galan, A. A. Hjorth, J. Paic, E. Schuldt, S. Schweinfurth, A. Sluse, D. Smette, A. Suyu, S. H. Cosmology and Nongalactic Astrophysics We report the discovery of the first example of an Einstein zig-zag lens, an extremely rare lensing configuration. In this system, J1721+8842, six images of the same background quasar are formed by two intervening galaxies, one at redshift $z_1 = 0.184$ and a second one at $z_2 = 1.885$. Two out of the six multiple images are deflected in opposite directions as they pass the first lens galaxy on one side, and the second on the other side -- the optical paths forming zig-zags between the two deflectors. In this letter, we demonstrate that J1721+8842, previously thought to be a lensed dual quasar, is in fact a compound lens with the more distant lens galaxy also being distorted as an arc by the foreground galaxy. Evidence supporting this unusual lensing scenario includes: 1- identical light curves in all six lensed quasar images obtained from two years of monitoring at the Nordic Optical Telescope; 2- detection of the additional deflector at redshift $z_2 = 1.885$ in JWST/NIRSpec IFU data; and 3- a multiple-plane lens model reproducing the observed image positions. This unique configuration offers the opportunity to combine two major lensing cosmological probes: time-delay cosmography and dual source-plane lensing since J1721+8842 features multiple lensed sources forming two distinct Einstein radii of different sizes, one of which being a variable quasar. We expect tight constraints on the Hubble constant and the equation of state of dark energy by combining these two probes on the same system. The $z_2 = 1.885$ deflector, a quiescent galaxy, is also the highest-redshift strong galaxy-scale lens with a spectroscopic redshift measurement. |
| title | J1721+8842: The first Einstein zig-zag lens |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2411.04177 |