Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HST resolved image and spectra of z=2 QSO 1345+584   The QSO 1345+584 has been spatially resolved by direct images and in spectral
images, and has extended flux asymmetrically to the W, where its inner radio
structure is seen. The brightest knots in the resolved flux correspond closely
with knots in the curved radio jet, and the brightest knot has velocity of
approach of some 3000 km/s with respect to the nucleus. Other parts of the
line-emitting material appear to follow a systematic velocity field with values
up to 1000 km/s with respect to the nucleus. The signal from the resolved
continuum is not detected spectroscopically but accounts for 2/3 of the (rest
UV) flux, so that it is likely to originate in hot stars. The QSO lies in or
behind a compact group of galaxies of comparable brightness and irregular and
knotty morphology, which probably form a dense physical group with very young
stellar populations.

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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: eess