Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A VLT colour image of the optical Einstein ring 0047-2808   The optical Einstein ring 0047-2808 was imaged by the VLT UT1 during the
science verification programme. The ring is the image of a high-redshift
z=3.595 star-forming galaxy, with strong Ly-alpha emission at 5589A,
gravitationally lensed by a massive early-type galaxy at z=0.485. Relative to
earlier NTT data the high signal-to-noise ratio of the VLT Ly-alpha narrow-band
image allows much improved constraints to be placed on the surface-brightness
profile of the source and on the mass, leading to a measured mass-to-light
ratio of M/L(B)~13h for the deflector galaxy. We have combined the VLT B-band
and Ly-alpha narrow-band images with a K-band image obtained at UKIRT to
produce a deep colour image of the system.

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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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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: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat