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- W4377016713 abstract "We report the detection of a high density of redshift $zapprox 10$ galaxies behind the foreground cluster Abell 2744, selected from imaging data obtained recently with NIRCam onboard {it JWST} by three programs -- GLASS-JWST, UNCOVER, and DDT#2756. To ensure robust estimates of the lensing magnification $mu$, we use an improved version of our model that exploits the first epoch of NIRCam images and newly obtained MUSE spectra, and avoids regions with $mu>5$ where the uncertainty may be higher. We detect seven bright $zapprox 10$ galaxies with demagnified rest-frame $-22 lesssim M_{rm UV}lesssim -19$ mag, over an area of $sim37$ sq. arcmin. Taking into account photometric incompleteness and the effects of lensing on luminosity and cosmological volume, we find that the density of $zapprox 10$ galaxies in the field is about $10times$ ($3times$) larger than the average at $M_{UV}approx -21~ (-20)$ mag reported so far. The density is even higher when considering only the GLASS-JWST data, which are the deepest and the least affected by magnification and incompleteness. The GLASS-JWST field contains 5 out of 7 galaxies, distributed along an apparent filamentary structure of 2 Mpc in projected length, and includes a close pair of candidates with $M_{rm UV}< -20$ mag having a projected separation of only 16 kpc. These findings suggest the presence of a $zapprox 10$ overdensity in the field. In addition to providing excellent targets for efficient spectroscopic follow-up observations, our study confirms the high density of bright galaxies observed in early {it JWST} observations, but calls for multiple surveys along independent lines of sight to achieve an unbiased estimate of their average density and a first estimate of their clustering." @default.
- W4377016713 created "2023-05-19" @default.
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- W4377016713 date "2023-05-01" @default.
- W4377016713 modified "2023-10-18" @default.
- W4377016713 title "Early Results from GLASS-JWST. XIX. A High Density of Bright Galaxies at z ≈ 10 in the A2744 Region" @default.
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