Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long Period Variables in NGC 5128: I. Catalogue   The first variable star catalogue in a giant elliptical galaxy NGC 5128
(Centaurus A) is presented. Using multi-epoch observations with ISAAC at the
VLT we have detected 1504 red variables in two halo fields covering 10.46
arcmin square. For the variables with at least 10 good measurements, periods
and amplitudes were determined using Fourier analysis and non-linear sine-curve
fitting algorithms. The final catalogue contains 1146 long period variables
with well established light curve parameters. Periods, amplitudes, JsHKs
photometry as well as individual Ks-band magnitudes are provided for all the
variables. The distribution of amplitudes ranges from 0.3 to a few magnitudes
in the Ks-band, with a median value around 0.7 mag. The amplitudes, mean
magnitudes and periods indicate that the majority of variables belong to the
class of long period variables with semiregular and Mira variables. Exhaustive
simulations were performed in order to assess the completeness of our catalogue
and the accuracy of the derived periods.

18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th