Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: PSR J1906+0746: From relativistic spin-precession to beam modeling   Shortly after the discovery of PSR J1906+0746, some hints of profile
variations were already interpreted as first signs of relativistic
spin-precession occuring. Using observations from the Nan\c{c}ay, Arecibo and
Green Bank Radio Observatories, we report here the measurement of pulse profile
and polarimetric variations. Using the Rotating Vector Model, we show that PSR
J1906+0746 is likely to be an orthogonal rotator ($\alpha \simeq 80^\circ$).
Fitting our polarimetric data to a precession model, we determined the geometry
of the pulsar and found a wide misalignment angle ($\delta = 89_{-44}^{+85}$
deg, 95% C.L.), although the uncertainty is large. Assuming this geometry, we
constructed the beam maps of both magnetic poles.

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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: math