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A new Einstein Cross gravitational lens of a Lyman-break galaxy

Bettoni, D., Falomo, R., Scarpa, R., Negrello, Mattia ORCID:, Omizzolo, A., Corradi, R. L. M., Reverte, D. and Vulcani, B. 2019. A new Einstein Cross gravitational lens of a Lyman-break galaxy. Astrophysical Journal Letters 873 (2) , L14. 10.3847/2041-8213/ab0aeb

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We report the study of an "Einstein Cross" configuration first identified in a set of HST images by Cerny et al. Deep spectroscopic observations obtained at the Spanish 10.4 m Gran Telescopio Canarias telescope, allowed us to demonstrate the lens nature of the system, that consists of a Lyman-break galaxy (LBG), not a quasi-stellar object as is usually the case, at z = 3.03 lensed by a galaxy at z = 0.556. Combining the new spectroscopy with the archival HST data, it turns out that the lens is an elliptical galaxy with M V = −21.0, effective radius 2.8 kpc, and stellar velocity dispersion σ = 208 ± 39 km s−1. The source is an LBG with Lyα luminosity ~L* at that redshift. From the modeling of the system, performed by assuming a singular isothermal ellipsoid (SIE) with external shear, we estimate that the flux source is magnified about 4.5 times, and the velocity dispersion of the lens is ${\sigma }_{\mathrm{SIE}}={197.9}_{-1.3}^{+2.6}$ km s−1, in good agreement with the value derived spectroscopically. This is the second case known of an Einstein cross of an LBG.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Astronomical Society
ISSN: 2041-8205
Date of First Compliant Deposit: 11 March 2019
Date of Acceptance: 27 February 2019
Last Modified: 04 May 2023 09:12

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