Stephen Boughn co-authored work investigating the connection between the cosmic microwave background and the cosmic X-ray background. A cross-correlation between their sky maps can probe the Integrated Sachs-Wolfe effect, providing a cosmological test that uses more than the microwave map alone.
The cited study specifically investigated foreground sources that might mimic the correlation. Its interpretation depended on testing those alternatives, illustrating why detection of a statistical association and identification of its physical origin are separate scientific steps.[ref]
Figure 1.
Portrait of Stephen Boughn
. External portrait linked from the institutional profile. Source.

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