Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Velocity Dispersions and Stellar Populations of the Most Compact and
  Massive Early-Type Galaxies at Redshift ~1   We present Gran-Telescopio-Canarias/OSIRIS optical spectra of 4 of the most
compact and massive early-type galaxies in the Groth Strip Survey at redshift
z~1, with effective radii Reff=0.5-2.4 kpc and photometric stellar masses
Mstar=1.2-4x10^11 Msun. We find these galaxies have velocity dispersions
sigma=156-236 km/s. The spectra are well fitted by single stellar population
models with approximately 1 Gyr of age and solar metallicity. We find that: i)
the dynamical masses of these galaxies are systematically smaller by a factor
of ~6 than the published stellar masses using BRIJK photometry; ii) when
estimating stellar masses as 0.7xMdyn, a combination of passive luminosity
fading with mass/size growth due to minor mergers can plausibly evolve our
objects to match the properties of the local population of early-type galaxies.

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The categories of this paper are: hep-lat
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The categories of this paper are: math
0
The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
1
The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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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: alg-geom
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The categories of this paper are: nucl-ex