Planck 2018 results
Free Access

Fig. 9.

image

High-frequency estimator results for feature and resonance models. Upper two panels: significance for the constant feature model (Eq. (15)) surveyed over the frequency range 0 <  ω <  3000 after marginalizing over the phase ϕ, for T and T + E SMICA maps. Bottom two panels: significance for the constant resonance model (Eq. (12)) surveyed over the frequency range 0 <  ω <  1000 after marginalizing over the phase ϕ, for T and T + E SMICA maps. As for the Modal expansion case, the high-frequency results generally have lower significance than obtained previously (PCNG15), with polarization data not tending to reinforce apparent peaks found using temperature data only.

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