Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low Frequency (11 mHz) Oscillations in H1743-322: A New Class of Black
  Hole QPOs?   We report the discovery of quasi-periodic oscillations (QPO) at ~11 mHz in
two RXTE observations and one Chandra observation of the black hole candidate
H1743-322. The QPO is observed only at the beginning of the 2010 and 2011
outbursts at similar hard colour and intensity, suggestive of an accretion
state dependence for the QPO. Although its frequency appears to be correlated
with X-ray intensity on timescales of a day, in successive outbursts eight
months apart we measure a QPO frequency that differs by less than ~2.2 mHz
while the intensity had changed significantly. We show that this ~11 mHz QPO is
different from the so-called Type-C QPOs seen in black holes and that the
mechanisms that produce the two flavours of variability are most probably
independent. After comparing this QPO with other variability phenomena seen in
accreting black holes and neutron stars, we conclude that it best resembles the
so-called "1 Hz" QPOs seen in dipping neutron star systems, although having a
significantly lower (1-2 orders of magnitude) frequency. If confirmed,
H1743-322 is the first black hole showing this type of variability. Given the
unusual characteristics and the hard-state dependence of the ~11 mHz QPO, we
also speculate whether these oscillations could instead be related to the radio
jets observed in H1743-322. A systematic search for this type of low-frequency
QPOs in similar systems is needed to test this speculation. In any case, it
remains unexplained why these QPOs have only been seen in the last two
outbursts of H1743-322.

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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org