Does the Correlation between 2MRS Galaxies and the CMB Indicate an Unmodeled CMB Foreground?
The Astrophysical Journal(2024)
摘要
We revisit the claimed detection of a new cosmic microwave background (CMB)
foreground based on the correlation between low-redshift 2MASS Redshift Survey
(2MRS) galaxies and CMB temperature maps from the Planck and WMAP missions. We
reproduce the reported measurements but argue that the original analysis
significantly underestimated the uncertainties. We cross-correlate the 2MRS
galaxy positions with simulated CMB maps and show that the correlation measured
with the real data for late-type spiral galaxies at angular scales
θ≥0.1^∘ and redshift cz<4500 km s^-1 is consistent with
zero at the 1.7σ level or less, depending on the exact CMB map and
simulation construction. This was the sample that formed the basis for the
original detection claim. For smaller angular separations the results are not
robust to galaxy type or CMB cleaning method, and we are unable to draw firm
conclusions. The original analysis did not propose a specific, falsifiable
physical correlation mechanism, and it is impossible to rule out any
contribution from an underlying physical effect. However, given our
calculations, the lack of signal from expanding the redshift range, and the
lack of corroboration from other galaxy surveys, we do not find the evidence
for a new CMB foreground signal compelling.
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关键词
Cosmic microwave background radiation,Observational cosmology
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