Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7
  $\leq$ z $\leq$ 5.4   We present our first results of the survey for high redshift quasars at $5
\lesssim {\rm z} \lesssim 5.7$. The search for quasars in this redshift range
has been known to be challenging due to limitations of filter sets used in
previous studies. We conducted a quasar survey for two specific redshift
ranges, 4.60 $\leq$ z $\leq$ 5.40 and 5.50 $\leq$ z $\leq$ 6.05, using
multi-wavelength data that include observations using custom-designed filters,
$is$ and $iz$. Using these filters and a new selection technique, we were able
to reduce the fraction of interlopers. Through optical spectroscopy, we
confirmed seven quasars at 4.7 $\leq$ z $\leq$ 5.4 with $-27.4 < M_{1450} <
-26.4$ which were discovered independently by another group recently. We
estimated black hole masses and Eddington ratios of four of these quasars from
optical and near-infrared spectra, and found that these quasars are undergoing
nearly Eddington-limited accretion which is consistent with the rapid growth of
supermassive black holes in luminous quasars at z $\sim$ 5.

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The categories of this paper are: econ
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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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: q-bio
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The categories of this paper are: cmp-lg