Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Globular Cluster Luminosity Function: New Progress in Understanding
  an Old Distance Indicator   I review the Globular Cluster Luminosity Function (GCLF) with emphasis on
recent observational data and theoretical progress. As is well known, the
turn-over magnitude (TOM) is a good distance indicator for early-type galaxies
within the limits set by data quality and sufficient number of objects. A
comparison with distances derived from surface brightness fluctuations with the
available TOMs in the V-band reveals, however, many discrepant cases. These
cases often violate the condition that the TOM should only be used as a
distance indicator in old globular cluster systems. The existence of
intermediate age-populations in early-type galaxies likely is the cause of many
of these discrepancies. The connection between the luminosity functions of
young and old cluster systems is discussed on the basis of modelling the
dynamical evolution of cluster systems. Finally, I briefly present the current
ideas of why such a universal structure as the GCLF exists.

30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
17
The categories of this paper are: q-fin