Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Simple New Method For Analysing Gapped Time-Series: Search For a High
  Frequency Cut-off In The X-ray Power Spectrum of MCG -6-30-15   We present a new, simple method for analysing gapped time-series which is
particularly suited to probe the X-ray power spectra of active galactic nuclei
(AGN).The method is applied to a four-day observation of the Seyfert 1 galaxy
MCG -6-30-15 with ASCA. MCG -6-30-15 is well-known for rapid, large amplitude
X-ray variability. In this source, our method probes the power spectrum in the
range 0.001 Hz to 0.05 Hz, thus extending the high-frequency coverage by a
factor of over 50 compared to previous studies. The ASCA data out a cessation
of variability up to 0.016 Hz at greater than 90% confidence. The power-law
index of the power spectrum is consistent with -1.4.At 0.021 Hz we can place an
upper limit of 7% on the intrinsic fluctuations of the source luminosity at
greater than 99% confidence. Above this frequency Poisson noise becomes
dominant but we can place an upper limit of 10% on intrinsic fluctuations up to
0.05 Hz at 98.9% confidence. The data argue against orbital modulation as the
origin of the variability since it would imply upper limits on the mass of the
putative black hole of less than half a million solar solar masses and
therefore super-Eddington luminosities.

32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math