Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multicomponent Power Density Spectra of Kepler AGNs, an instrumental
  artifact or a physical origin?   We analysed the light curves of four active galactic nuclei (AGN) from the
Kepler field, and find multicomponent power density spectra with characteristic
frequencies that are surprisingly similar to other Kepler AGNs (including
ZW229-15). An identical time series analysis of randomly selected planet
candidate stars revealed the same features, suggesting an instrumental origin
for the variability. This result is enigmatic, as these signals have been
confirmed for ZW229-15 using independent observations from Swift. Based on our
re-analysis of these Swift data and test simulations, we now distinguish the
instrumental artifact in Kepler data from the real pattern in Swift
observations. It appears that some other AGNs observed with instruments such as
XMM-Newton show similar frequency components. This supports the conclusion that
the similarity between the variability timescales of the Kepler artifact and
real Swift features is coincidental.

16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an