Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Noise in the Cross-Power Spectrum of the Vela Pulsar   We compare the noise in interferometric measurements of the Vela pulsar from
ground- and space-based antennas with theoretical predictions. The noise
depends on both the flux density and the interferometric phase of the source.
Because the Vela pulsar is bright and scintillating, these comparisons extend
into both the low and high signal-to-noise regimes. Furthermore, our diversity
of baselines explores the full range of variation in interferometric phase. We
find excellent agreement between theoretical expectations and our estimates of
noise among samples within the characteristic scintillation scales. Namely, the
noise is drawn from an elliptical Gaussian distribution in the complex plane,
centered on the signal. The major axis, aligned with the signal phase, varies
quadratically with the signal, while the minor axis, at quadrature, varies with
the same linear coefficients. For weak signal, the noise approaches a circular
Gaussian distribution. Both the variance and covariance of the noise are also
affected by artifacts of digitization and correlation. In particular, we show
that gating introduces correlations between nearby spectral channels.

30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an