Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploring Low Luminosity Quasar Diversity at z ~ 2.5 with the Gran
  Telescopio Canarias   We present preliminary results from a pencil-beam spectroscopic survey of
low-luminosity quasars at z ~ 2.2-2.5. Our goal is to compare these sources
with low redshift analogues of similar luminosity. High s/n and moderate
resolution spectra were obtained for 15 sources using the faint object
spectrograph Osiris on the 10m Gran Telescopio Canarias. The new data make
possible an almost unprecedented comparison between sources with the same
(moderate) luminosity at widely different cosmic epochs. Preliminary analysis
of our spectra confirms the presence of a relatively evolved population of
quasars radiating at modest Eddington ratios. A notable difference between the
low and high z quasars may involve the presence of lower metallicity quasars at
high redshift.

18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex