Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of two new persistent Be/X-ray pulsar systems   We present RXTE observations of two recently identified massive X-ray
binaries. RX J0440.9+4431/BSD 24-491 and RX J1037.5-564/LS 1698 are confirmed
as accreting Be/X-ray systems following the discovery of X-ray pulsations, with
barycentric pulse periods of 202.5$\pm$0.5 s and 860$\pm$2 s respectively. The
X-ray spectral analysis shows that the energy spectra of the pulsars can be
represented by a power-law, modified at low energy by an absorption component
and at high energy by a cut-off. Very weak Fe lines may be present. Both
sources appear to display a low cut-off energy when compared to typical X-ray
pulsars, low X-ray variability (factor of < 10), and no dependence of the X-ray
spectrum with energy. Given the similarity of these X-ray properties with those
of the other persistent BeXRB pulsars, 4U0352+309/X Per and RX J0146.9+6121/LS
I +61 235, we suggest that RX J0440.9+4431/BSD 24-491 and RX J1037.5-564/LS
1698 are also members of this subclass.

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The categories of this paper are: hep-ex
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg