Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of Elliptical Galaxies at z >~ 1 Revealed from a Large,
  Multicolor Sample of Extremely Red Objects   We study the evolution of elliptical galaxies at z >~ 1 on the basis of a
sample of 247 Extremely Red Objects (EROs) with R-Ks >= 3.35 (AB) and Ks <=
22.1 (AB) constructed from BVRi'z'JHKs multicolor data of a 114 arcmin2 area in
the Subaru/XMM Deep Survey Field. By fitting template spectra of old
ellipticals (OEs) and young, dusty starbursts (DSs) to the multicolor data, we
classify EROs into these two classes and estimate their redshifts. We find that
58% of the EROs in our sample belong to the OE class and that 24% of the OEs
are fit by a spectrum having a disk component with the B-band bulge-to-total
luminosity ratio of <= 0.9. We compare the observed surface density of OEs with
predictions from passive evolution models. We then derive rest-frame B-band
luminosity functions (LFs) of OEs in our sample at z=1-1.5 and 1.5-2.5. We find
that the LF at z=1-1.5 roughly agrees with the LF of local ellipticals if a
dimming of 1.3 mag from z=1.25 to the present epoch is assumed. On the other
hand, the amplitude of the LF at z=1.5-2.5 is found to be lower than that of
the local LF by a factor of ~ 3 over the whole range of magnitude observed.
Taking account of a strong decrease in the number density of morphologically
classified early-type galaxies at z >~ 1.5 found by several authors, we
conclude that the majority of ellipticals seen at present have not established
either a red color or a smooth 1/4-law profile before z ~ 1.5$. (abridged)

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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex