Pb with Lyman-alpha detection around z~3.7 with redrock

desihub / desispec

DESI spectral pipeline

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Pb with Lyman-alpha detection around z~3.7 with redrock #2278

Open echaussidon opened 3 weeks ago

echaussidon commented 3 weeks ago

Hi,

As already noticed in the previous spectro release, redrock detects fake Lyman-alpha emission peak around z\~3.8 i.e. for an emission peak located between two arms of the spectrograph. (Note that the effect should also exist around z\~5.2).

Attached the redshift distribution of the QSO targets that are SPECTYPE=='QSO':

echaussidon commented 3 weeks ago

@julienguy