Discovery of a Very Bright and Intrinsically Very Luminous, Strongly Lensed Lyα Emitting Galaxy at z = 2.82 in the BOSS Emission-Line Lens Survey

Rui Marques-Chaves, Ismael Pérez-Fournon, Yiping Shu, Paloma I. Martínez-Navajas, Adam S. Bolton, Christopher S. Kochanek, Masamune Oguri, Zheng Zheng, Shude Mao, Antonio D. Montero-Dorta, Matthew A. Cornachione, Joel R. Brownstein

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    Abstract

    We report the discovery of a very bright (r = 20.16), highly magnified, and yet intrinsically very luminous Lyα emitter (LAE) at . This system comprises four images in the observer plane with a maximum separation of and it is lensed by a massive early-type galaxy. It was initially identified in the Baryon Oscillation Spectroscopic Survey Emission-Line Lens Survey for GALaxy-Lyα EmitteR sYstems survey, and follow-up imaging and spectroscopic observations using the Gran Telescopio Canarias and William Herschel Telescope confirmed the lensing nature of this system. A lens model using a singular isothermal ellipsoid in an external shear field reproduces the main features of the system quite well, yielding an Einstein radius of 2.″95 ± 0.″10, and a total magnification factor for the LAE of 8.8 ± 0.4. This LAE is one of the brightest and most luminous galaxy-galaxy strong lenses known. We present initial imaging and spectroscopy showing the basic physical and morphological properties of this lensed system.

    Original languageEnglish
    Article numberL18
    JournalAstrophysical Journal Letters
    Volume834
    Issue number2
    DOIs
    Publication statusPublished - 10 Jan 2017

    Keywords

    • cosmology: observations
    • galaxies: evolution
    • galaxies: individual (BG1429+1202)
    • gravitational lensing: strong

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