Extended Data Fig. 3: White noise tests for soft X-ray PDS of AT2018cow.
From: Evidence for a compact object in the aftermath of the extragalactic transient AT2018cow
(a): Comparing the empirical distribution function (EDF) of the values in the PDS continuum (blue histogram) with the cumulative distribution function of a χ2 distribution with 2 × 105 × 2048 degrees of freedom. (b): Comparison of the observed probability distribution function (PDF) with the expected PDF of a χ2 distribution with 2 × 105 × 2048 dof. (c): The distribution of the K-S statistic derived from EDFs sampled from a χ2 distribution with 2 × 105 × 2048 dof. (d): Same as (c) but using an Anderson-Darling test statistic. Both the test statistic values are consistent with a χ2 distribution and suggest that the PDS continuum is white (see section PDS continuum is consistent with White noise for more details).
