Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Typical AGN at intermediate redshifts   We study the host galaxies and black holes of typical X-ray selected AGN at
intermediate redshifts (z~0.5-1.4). The AGN are selected such that their
spectral energy distributions are dominated by stellar emission, i.e., they
show a prominent 1.6micron bump thus minimizing the AGN emission contamination.
This AGN population comprises approximately 50% of the X-ray selected AGN at
these redshifts. AGN reside in the most massive galaxies at the redshifts
probed here, with characteristic stellar masses that are intermediate between
those of local type 2 AGN and high redshift (z~2) AGN. The inferred black hole
masses of typical AGN are similar to those of optically identified quasars at
similar redshifts. Since the AGN in our sample are much less luminous than
quasars, typical AGN have low Eddington ratios. This suggests that, at least at
intermediate redshifts, the cosmic AGN 'downsizing' is due to both a decrease
in the characteristic stellar mass of the host galaxies, and less efficient
accretion. Finally there is no strong evidence in AGN host galaxies for either
highly suppressed star formation, expected if AGN played a role in quenching
star formation, or elevated star formation when compared to mass selected
galaxies of similar stellar masses and redshifts.

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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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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: mtrl-th
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The categories of this paper are: acc-phys