Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The quasar M_bh - M_host relation through Cosmic Time I - Dataset and
  black hole masses   We study the M_bh - M_host relation as a function of Cosmic Time in a sample
of 96 quasars from z=3 to the present epoch. In this paper we describe the
sample, the data sources and the new spectroscopic observations. We then
illustrate how we derive M_bh from single-epoch spectra, pointing out the
uncertainties in the procedure. In a companion paper, we address the dependence
of the ratio between the black hole mass and the host galaxy luminosity and
mass on Cosmic Time.

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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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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: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: chem-ph