Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A study of the low-frequency quasi-periodic oscillations in the X-ray
  light curves of the black hole candidate XTE J1859+226   We present the results of an extensive timing analysis of the 1999 outburst
of the soft X-ray transient and black hole candidate XTE J1859+226 as observed
with the Rossi X-Ray Timing Explorer. Three main different types of low
frequency (1-9 Hz) quasi-periodic oscillations (QPOs) were observed and
classified, strenghtening the general picture that is emerging for the
variability properties of black hole X-ray binaires. Rapid transitions between
different power spectral shapes were observed and their link with the count
rate was studied. Furthermore, we show that a frequency of ~6 Hz seems to hold
a particular place: one of the three QPO types we found was very stable when at
this frequency, as it happens in Z sources as well. The coherence of its
subharmonic peak was higher when the fundamental was close to 6 Hz, thus
suggesting the presence of some resonance at this frequency.

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The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics