Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Relationship between Galaxy Formation and Quasar Evolution   We compare the evolution with cosmic time of the star-formation rate per
comoving volume in galaxies and of the volume emissivity by Active Galactic
Nuclei, as a clue to understand the relationship between black hole accretion
and the formation of the surrounding structure. We find an interesting
similarity between the evolution rates for the total populations of galaxies
and AGNs, which indicates that, on average, the history of BH accretion tracks
that of stellar formation in the hosting galaxies. Similarly, the evolution of
luminous quasars parallels that of the stellar populations in massive
spheroidal galaxies, in keeping with the locally established association of
supermassive BHs and galactic bulges. We finally comment on our finding that
high-luminosity, high-mass systems evolve on a faster cosmic timescale than the
lower mass ones: to explain this, the theories of structure formation based on
the gravitational collapse of dark matter halos have to be complemented with a
detailed description of the dynamical processes in the baryonic component,
which dominate the formation and evolution in high-density environments.

12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
2
The categories of this paper are: math
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin