Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of a Very Bright and Intrinsically Very Luminous, Strongly
  Lensed Ly{\alpha} Emitting Galaxy at z = 2.82 in the BOSS Emission-Line Lens
  Survey   We report the discovery of a very bright (r = 20.16), highly magnified, and
yet intrinsically very luminous Ly{\alpha} emitter (LAE) at z = 2.82. This
system comprises four images in the observer plane with a maximum separation of
~ 6" and it is lensed by a z = 0.55 massive early-type galaxy. It was initially
identified in the Baryon Oscillation Spectroscopic Survey (BOSS) Emission-Line
Lens Survey for GALaxy-Ly{\alpha} EmitteR sYstems (BELLS GALLERY) survey, and
follow-up imaging and spectroscopic observations using the Gran Telescopio
Canarias (GTC) and William Herschel Telescope (WHT) confirmed the lensing
nature of this system. A lens model using a singular isothermal ellipsoid in an
external shear field reproduces quite well the main features of the system,
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.

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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph