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http://hdl.handle.net/20.500.12386/28859
Titolo: | A New Einstein Cross Gravitational Lens of a Lyman-break Galaxy | Autori: | BETTONI, Daniela FALOMO, Renato Scarpa, Riccardo Negrello, Mattia Omizzolo, Alessando Corradi, Romano L. M. Reverte, Daniel Vulcani, Benedetta |
Data pubblicazione: | 2019 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 873 | Fascicolo: | 2 | Da pagina:: | 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 |
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