Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Where are the X-ray QPOs in active galaxies?   In this paper we address the question of whether existing X-ray observations
of Seyfert galaxies are sufficiently sensitive to detect quasi-periodic
oscillations (QPOs) similar to those observed in the X-ray variations of
Galactic Black Holes (GBHs). We use data from XMM-Newton and simulated data
based on the best RXTE long-term monitoring light curves, to show that if X-ray
QPOs are present in Seyfert X-ray light curves - with similar shapes and
strengths to those observed in GBHs, but at lower frequencies commensurate with
their larger black hole masses - they would be exceedingly difficult to detect.
Our results offer a simple explanation for the present lack of QPO detections
in Seyferts. We discuss the improvements in telescope size and monitoring
patterns needed to make QPO detections feasible. The most efficient type of
future observatory for searching for X-ray QPOs in AGN is an X-ray All-Sky
Monitor (ASM). A sufficiently sensitive ASM would be ideally suited to
detecting low frequency QPOs in nearby AGN. The detection of AGN QPOs would
strengthen the AGN-GBH connection and could serve as powerful diagnostics of
the black hole mass, and the structure of the X-ray emitting region in AGN.

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The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
9
The categories of this paper are: nlin
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
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org