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• W4387210367 abstract "Aims. We provide an in-depth analysis of the COSMOS-Web ring, an Einstein ring at z=2 that we serendipitously discovered in the COSMOS-Web survey and possibly the most distant lens discovered to date. Methods. We extract the visible and NIR photometry from more than 25 bands and we derive the photometric redshifts and physical properties of both the lens and the source with three different SED fitting codes. Using JWST/NIRCam images, we also produce two lens models to (i) recover the total mass of the lens, (ii) derive the magnification of the system, (iii) reconstruct the morphology of the lensed source, and (iv) measure the slope of the total mass density profile of the lens. Results. The lens is a very massive and quiescent (sSFR < 10^(-13) yr-1) elliptical galaxy at z = 2.02 pm 0.02 with a total mass Mtot(<thetaE) = (3.66 pm 0.36) x 10^11 Msun and a stellar mass M* = (1.37 pm 0.14) x 10^11 Msun. Compared to SHMRs from the literature, we find that the total mass is consistent with the presence of a DM halo of mass Mh = 1.09^(+1.46)_(-0.57) x 10^13 Msun. In addition, the background source is a M* = (1.26 pm 0.17) x 10^10 Msun star-forming galaxy (SFR=(78 pm 15) Msun/yr) at z = 5.48 pm 0.06. Its reconstructed morphology shows two components with different colors. Dust attenuation values from SED fitting and nearby detections in the FIR also suggest it could be partially dust-obscured. Conclusions. We find the lens at z=2. Its total, stellar, and DM halo masses are consistent within the Einstein ring, so we do not need any unexpected changes in our description of the lens (e.g. change its IMF or include a non-negligible gas contribution). The most likely solution for the lensed source is at z = 5.5. Its reconstructed morphology is complex and highly wavelength dependent, possibly because it is a merger or a main sequence galaxy with a heterogeneous dust distribution." @default.
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• W4387210367 date "2023-09-27" @default.
• W4387210367 modified "2023-10-07" @default.
• W4387210367 title "The COSMOS-Web ring: in-depth characterization of an Einstein ring lensing system at z~2" @default.
• W4387210367 doi "https://doi.org/10.48550/arxiv.2309.15986" @default.
• W4387210367 hasPublicationYear "2023" @default.
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