Evidence of cross-correlation between the CMB lensing and the gamma-ray sky

Abstract

We report the measurement of the angular power spectrum of cross-correlation between the unresolved component of the Fermi-LAT gamma-ray sky-maps and the CMB lensing potential map reconstructed by the Planck satellite. The matter distribution in the Universe determines the bending of light coming from the last scattering surface. At the same time, the matter density drives the growth history of astrophysical objects, including their capability at generating non-thermal phenomena, which in turn give rise to gamma-ray emissions. The Planck lensing map provides information on the integrated distribution of matter, while the integrated history of gamma-ray emitters is imprinted in the Fermi-LAT sky maps. We report here the first evidence of their correlation. We find that the multipole dependence of the cross-correlation measurement is in agreement with current models of the gamma-ray luminosity function for AGN and star forming galaxies, with a statistical evidence of 3.0$\sigma$. Moreover, its amplitude can in general be matched only assuming that these extra-galactic emitters are also the bulk contribution of the measured isotopic gamma-ray background (IGRB) intensity. This leaves little room for a big contribution from galactic sources to the IGRB measured by Fermi-LAT, pointing toward a direct evidence of the extragalactic origin of the IGRB.

arXiv comment6 pages, 2 figures. v2: analysis updated with Planck 2015 lensing map and 3FGL catalogue, conclusions strengthened; to appear in ApJ Letters

References in corpus (24)

• Planck 2013 results. XVI. Cosmological parameters
• Large scale bias and the peak background split
• Halo Models of Large Scale Structure
• Fermi Large Area Telescope Second Source Catalog
• Weak Gravitational Lensing of the CMB
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• MASTER of the CMB Anisotropy Power Spectrum: A Fast Method for Statistical Analysis of Large and Complex CMB Data Sets
• The Fermi Large Area Telescope On Orbit: Event Classification, Instrument Response Functions, and Calibration
• CMB Lensing Reconstruction on the Full Sky
• The Herschel PEP/HerMES Luminosity Function. I: Probing the Evolution of PACS selected Galaxies to z~4
• Gravitational Lensing
• Planck 2013 results. XVII. Gravitational lensing by large-scale structure
• GeV Observations of Star-forming Galaxies with \textit{Fermi} LAT
• The Cosmic Evolution of Fermi BL Lacertae Objects
• The Luminosity Function of Fermi-detected Flat-Spectrum Radio Quasars
• Fast estimation of polarization power spectra using correlation functions
• Myths and Truths Concerning Estimation of Power Spectra
• Diffuse $\gamma$-ray emission from misaligned active galactic nuclei
• A novel approach in the WIMP quest: Cross-Correlation of Gamma-Ray Anisotropies and Cosmic Shear
• Cross-Correlation of Cosmic Shear and Extragalactic Gamma-ray Background: Constraints on the Dark Matter Annihilation Cross-Section
• Particle dark matter searches in the anisotropic sky
• Corrected Table for the Parametric Coefficients for the Optical Depth of the Universe to Gamma-rays at Various Redshifts
• A cross-correlation study of the Fermi-LAT $\gamma$-ray diffuse extragalactic signal
• Clustering of gamma-ray selected 2LAC Fermi Blazars

Cited by in corpus (42)

• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• Fundamental Physics with the Square Kilometre Array
• Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
• Science with e-ASTROGAM (A space mission for MeV-GeV gamma-ray astrophysics)
• The nature of the Diffuse Gamma-Ray Background
• Sensitivity Projections for Dark Matter Searches with the Fermi Large Area Telescope
• Composition of the Fermi-LAT isotropic gamma-ray background intensity: Emission from extragalactic point sources and dark matter annihilations
• The Atacama Cosmology Telescope: Lensing of CMB Temperature and Polarization Derived from Cosmic Infrared Background Cross-Correlation
• The angular power spectrum of the diffuse gamma-ray emission as measured by the Fermi Large Area Telescope and constraints on its Dark Matter interpretation
• Tomographic Constraints on High-Energy Neutrinos of Hadronuclear Origin
• Tomographic-spectral approach for dark matter detection in the cross-correlation between cosmic shear and diffuse gamma-ray emission
• The Atacama Cosmology Telescope: measuring radio galaxy bias through cross-correlation with lensing
• Modeling CMB Lensing Cross Correlations with {\sc CLEFT}
• Cross-correlating the gamma-ray sky with catalogs of galaxy clusters
• Mapping Extragalactic Dark Matter Annihilation with Galaxy Surveys: A Systematic Study of Stacked Group Searches
• Cosmological constraints from a joint analysis of cosmic microwave background and spectroscopic tracers of the large-scale structure
• CFHTLenS and RCSLenS Cross-Correlation with Planck Lensing Detected in Fourier and Configuration Space
• Unresolved Gamma-Ray Sky through its Angular Power Spectrum
• Cross-correlation of weak lensing and gamma rays: implications for the nature of dark matter
• Impact of axisymmetric mass models for dwarf spheroidal galaxies on indirect dark matter searches
• Cross-Correlation of the Extragalactic Gamma-ray Background with Luminous Red Galaxies
• The role of the eROSITA all-sky survey in searches for sterile neutrino dark matter
• Detection of cross-correlation between gravitational lensing and gamma rays
• Tomographic imaging of the Fermi-LAT gamma-ray sky through cross-correlations: A wider and deeper look
• Characterizing the local gamma-ray Universe via angular cross-correlations
• Searching for gamma-ray emission from galaxy clusters at low redshift
• The correlation of extragalactic $\gamma$-rays with cosmic matter density distributions from weak-gravitational lensing
• Planck Lensing and Cosmic Infrared Background Cross-Correlation with Fermi-LAT: Tracing Dark Matter Signals in the Gamma-Ray Background
• Astrophysical interpretation of the anisotropies in the unresolved gamma-ray background
• Measurement of redshift dependent cross correlation of HSC clusters and Fermi $\gamma$ rays
• Synergies across the spectrum for particle dark matter indirect detection: how HI intensity mapping meets gamma rays
• Searching for Signal of Primordial Black Hole from CMB Lensing and $\gamma$-ray Emissions
• A Cross-correlation Study between IceCube Neutrino Events and the Fermi Unresolved Gamma-ray Sky
• Detecting ultra-high energy cosmic ray anisotropies through cross-correlations
• Got plenty of nothing: cosmic voids as a probe of particle dark matter
• Cross Correlation of the Extragalactic Gamma-ray Background with Thermal Sunyaev-Zel'dovich Effect in the Cosmic Microwave Background
• Constraints on dark matter and astrophysics from tomographic $\gamma$-ray cross-correlations
• High-Significance Detection of Correlation Between the Unresolved Gamma-Ray Background and the Large Scale Cosmic Structure
• Smallest Halos in Thermal Wino Dark Matter
• Dark Matter and Galaxy Cross-Correlations with the Cherenkov Telescope Array Observatory
• KiDS-Legacy: WIMP dark matter constraints from the cross-correlation of weak lensing and Fermi-LAT gamma rays
• Wiener filtering and multi-tracer techniques for dark matter cross-correlations between gamma-ray emission and galaxy catalogs