A p<0.0001 detection of CMB cooling in galactic halos and its possible relation to dark matter

Abstract

We confirm at the $5.7\sigma$ level previous studies reporting Cosmic Microwave Background (CMB) temperatures being significantly lower around nearby spiral galaxies than expected in the $\Lambda$CDM model. Results from our earlier work was disputed in a recent paper, but in that paper, areas far beyond the galactic halos were included in the analysis while the neighborhood of the galaxies where the main signal is seen was disregarded. Here we limit the study to pixels well within the galactic halos, focus on galaxies in dense cosmic filaments and improve on signal-to-noise compared to previous studies. The average CMB temperature in discs around these galaxies is always much lower in Planck data than in any of the 10.000 Planck-like CMB simulations. Even when correcting for the look-elsewhere-effect, the detection is still at the $3-4\sigma$ level. We further show that the largest scales ($\ell <16$) of the Planck CMB fluctuations are more correlated with the distribution of nearby galaxies than $99.99\%$ of simulated CMB maps. We argue that the existence of a new CMB foreground cannot be ignored and a physical interaction mechanism, possibly involving dark matter, as well as linked to intergalactic magnetic fields, should be sought.

arXiv commentVersion accepted for publication in A&A

References in corpus (27)

• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Emission
• The 2MASS Redshift Survey - Description and Data Release
• The persistent cosmic web and its filamentary structure I: Theory and implementation
• Planck 2013 results. XV. CMB power spectra and likelihood
• Detection of non-Gaussianity in the WMAP 1-year data using spherical wavelets
• Planck 2018 results. VII. Isotropy and Statistics of the CMB
• Planck 2018 results. IV. Diffuse component separation
• Planck intermediate results. LVII. Joint Planck LFI and HFI data processing
• The persistent cosmic web and its filamentary structure II: Illustrations
• Testing Chameleon Theories with Light Propagating through a Magnetic Field
• Explaining Cosmological Anisotropy: Evidence for Causal Horizons from CMB data
• Characterising filaments in the SDSS volume from the galaxy distribution
• Like a spider in its web: a study of the Large Scale Structure around the Coma cluster
• Relative distribution of dark matter, gas, and stars around cosmic filaments in the IllustrisTNG simulation
• Decoupling the rotation of stars and gas -- I: the relationship with morphology and halo spin
• Cosmoglobe DR1 results. II. Constraints on isotropic cosmic birefringence from reprocessed WMAP and Planck LFI data
• Constraining ALP-photon coupling using galaxy clusters
• The 2MASS redshift survey galaxy group catalogue derived from a graph-theory based friends-of-friends algorithm
• Decoupling the rotation of stars and gas -- II: the link between black hole activity and MaNGA kinematics in TNG
• A possible common explanation for several cosmic microwave background (CMB) anomalies: A strong impact of nearby galaxies on observed large-scale CMB fluctuations
• An improved Compton parameter map of thermal Sunyaev-Zeldovich effect from Planck PR4 data
• The cosmic shallows I: interaction of CMB photons in extended galaxy halos
• Axion-photon Propagation in Magnetized Universe
• The CMB Cold Spot as predicted by foregrounds around nearby galaxies
• The Chameleonic Contribution to the SZ Radial Profile of the Coma Cluster

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