Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Statistical Study on the Low-Frequency QPO Amplitude Spectrum and
  Amplitude in GRS 1915+105   A statistical study was made on both the energy dependence of the
low-frequency quasi-periodic oscillation (QPO) amplitude (LFQPO amplitude
spectrum) and the LFQPO amplitude from all the RXTE observations of GRS
1915+105. Based on the two-branch correlation of the LFQPO frequency and the
hardness ratio, the observations that were suitable for evaluating the LFQPO
amplitude spectrum were divided into two groups. According to a comparison
between the radio and X-ray emissions, we deduced that the jets during the two
groups of observations are very different. A negative correlation between the
LFQPO frequency and the radio flux was found for one group. The LFQPO amplitude
spectrum was fitted by a power-law with an exponential cutoff in order to
describe it quantitatively. It reveals that as the LFQPO frequency increases,
the power-law hardens. And the cutoff energy firstly decreases, and then
smoothly levels off. The fit also shows that the LFQPO amplitude spectra of the
two groups are essentially the same, suggesting that the LFQPO seems not to
originate from the jet. The LFQPO amplitude spectra are hard, indicating a
possible origin of the LFQPO in the corona. As the LFQPO frequency increases,
the LFQPO amplitude firstly increases and then decreases. The effects of the
low pass filter and the jet on the LFQPO amplitude are discussed.

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The categories of this paper are: mtrl-th
2
The categories of this paper are: math
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: dg-ga