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damonge / CoLoRe

CoLoRe - Cosmological Lofty Realizations
GNU General Public License v3.0
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Dipole in the QSO x density skewers #67

Open andreufont opened 1 year ago

andreufont commented 1 year ago

A few months ago, Abby Bault (PhD student of David Kirkby at UC Irvine) spotted a systematic shift in the QSO x Lya cross-correlation in CoLoRe mocks. Andrei Cuceu (postdoc at OSU) was able to track this down to a dipole in the outputs of CoLoRe themselves (before going into LyaCoLoRe).

colore_full

It looks like there might be a indexation error or similar in the computation of the lines of sight in CoLoRe, or something along these lines. James Farr didn't notice this because he was always looking at all-sky mocks (where this averages to zero), and it does not really matter for BAO studies, but it would be nice to understand the cause of this and fix it at some point.

andreufont commented 1 year ago

@andreicuceu, @cramirezpe , @damonge