Variance and Skewness in the FIRST survey

Details Variance and Skewness in the FIRST survey Variance and Skewness in the FIRST survey

1998-02-20

arxiv.org/abs/astro-ph/9802269v2

Astronomy and Astrophysics

Astrophysics

13 pages, 21 inline figures, to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01904.x

We investigate the large-scale clustering of radio sources in the FIRST 1.4-GHz survey by analysing the distribution function (counts in cells). We select a reliable sample from the the FIRST catalogue, paying particular attention to the problem of how to define single radio sources from the multiple components listed. We also consider the incompleteness of the catalogue. We estimate the angular two-point correlation function $w(\theta)$, the variance $\Psi_2$, and skewness $\Psi_3$ of the distribution for the various sub-samples chosen on different criteria. Both $w(\theta)$ and $\Psi_2$ show power-law behaviour with an amplitude corresponding a spatial correlation length of $r_0 \sim 10 h^{-1}$Mpc. We detect significant skewness in the distribution, the first such detection in radio surveys. This skewness is found to be related to the variance through $\Psi_3=S_3(\Psi_2)^{\alpha}$, with $\alpha=1.9\pm 0.1$, consistent with the non-linear gravitational growth of perturbations from primordial Gaussian initial conditions. We show that the amplitude of variance and skewness are consistent with realistic models of galaxy clustering.

Affiliated with

Also associated with

No associations

Rating

Variance and Skewness in the FIRST survey does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Variance and Skewness in the FIRST survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variance and Skewness in the FIRST survey will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-172367