Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass-to-Light ratio, Initial Mass Function and chemical evolution in
  disc galaxies   Cosmological simulations of disc galaxy formation, when compared to the
observed Tully-Fisher relation, suggest a low Mass-to-Light (M/L) ratio for the
stellar component in spirals. We show that a number of "bottom-light" Initial
Mass Functions (IMFs) suggested independently in literature, do imply M/L
ratios as low as required, at least for late type spirals (Sbc/Sc). However the
typical M/L ratio, and correspondingly the zero-point of the Tully-Fisher
relation, is expected to vary considerably with Hubble type.
  Bottom-light IMFs tend to have a metal production in excess of what is
tipically estimated for spiral galaxies. Suitable tuning of the IMF slope and
mass limits, post-supernova fallback of metals onto black holes or metal
outflows must then be invoked, to reproduce the observed chemical properties of
disc galaxies.

25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph