The EDGES collaboration reported the finding of an unexpectedly deep absorption in the radio background at 78 MHz and interpreted the dip as a first detection of redshifted 21-cm from Cosmic Dawn .
We have attempted an alternate analysis , adopting a maximally smooth function approach to model the foreground .
A joint fit to the spectrum using such a function together with a flattened absorption profile yields a best fit absorption amplitude of 921 \pm 35 mK .
The depth of the 21-cm absorption inferred by the EDGES analysis required invoking non-standard cosmology or new physics or new sources at Cosmic Dawn and this tension with accepted models is compounded by our analysis that suggests absorption of greater depth .
Alternatively , the measured spectrum may be equally-well fit assuming that there exists a residual unmodeled systematic sinusoidal feature and we explore this possibility further by examining for any additional 21-cm signal .
The data then favors an absorption with Gaussian model parameters of amplitude 133 \pm 60 mK , best width at half-power 9 \pm 3 MHz and center frequency 72.5 \pm 0.8 MHz .
We also examine the consistency of the measured spectrum with plausible redshifted 21-cm models : a set of 3 of the 265 profiles in the global 21-cm atlas of ( ) are favored by the spectrum .
We conclude that the EDGES data may be consistent with standard cosmology and astrophysics , without invoking excess radio backgrounds or baryon-dark matter interactions .