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A new Einstein Cross gravitational lens of a Lyman-break galaxy
- Publication Year :
- 2019
- Publisher :
- American Astronomical Society, 2019.
-
Abstract
- We report the study of an "Einstein Cross" configuration first identified in a set of HST images by Cerny et al. 2018. Deep spectroscopic observations obtained at the Spanish 10.4m GTC telescope, allowed us to demonstrate the lens nature of the system, that consists of a Lyman-break galaxy, not a QSO 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 sigma=208+-39 km/sec. The source is a Lyman break galaxy with Ly_alpha 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_SIE=197.9-1.3+2.6 km/s, in good agreement with the value derived spectroscopically. This is the second case known of an Einstein cross of a Lyman-break galaxy.<br />Comment: 7 pages, 6 figures, 1 Table; accepted for publication in ApJ Lett
- Subjects :
- Physics
010504 meteorology & atmospheric sciences
FOS: Physical sciences
Velocity dispersion
Astronomy and Astrophysics
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics - Astrophysics of Galaxies
01 natural sciences
Galaxy
Redshift
Luminosity
Einstein Cross
symbols.namesake
Gravitational lens
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
0103 physical sciences
Elliptical galaxy
symbols
Astrophysics::Earth and Planetary Astrophysics
010303 astronomy & astrophysics
Lyman-break galaxy
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- ISSN :
- 20418205
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....2347a334cd66c49a1d7bc511b9bee101