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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28859
Title: A New Einstein Cross Gravitational Lens of a Lyman-break Galaxy
Authors: BETTONI, Daniela 
FALOMO, Renato
Scarpa, Riccardo
Negrello, Mattia
Omizzolo, Alessando
Corradi, Romano L. M.
Reverte, Daniel
Vulcani, Benedetta 
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL LETTERS 
Number: 873
Issue: 2
First Page: L14
Abstract: 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 <SUB> V </SUB> = -21.0, effective radius 2.8 kpc, and stellar velocity dispersion σ = 208 ± 39 km s<SUP>-1</SUP>. 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 {σ }<SUB>SIE</SUB>}={197.9}<SUB>-1.3</SUB><SUP>+2.6</SUP> km s<SUP>-1</SUP>, in good agreement with the value derived spectroscopically. This is the second case known of an Einstein cross of an LBG.
URI: http://hdl.handle.net/20.500.12386/28859
URL: https://iopscience.iop.org/article/10.3847/2041-8213/ab0aeb/pdf
ISSN: 2041-8205
DOI: 10.3847/2041-8213/ab0aeb
Bibcode ADS: 2019ApJ...873L..14B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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