Tomographic imaging of the Fermi-LAT gamma-ray sky through cross-correlations: A wider and deeper look

Abstract

We investigate the nature of the extragalactic unresolved gamma-ray background (UGRB) by cross-correlating several galaxy catalogs with sky-maps of the UGRB built from 78 months of Pass 8 Fermi-Large Area Telescope data. This study updates and improves similar previous analyses in several aspects. Firstly, the use of a larger gamma-ray dataset allows us to investigate the energy dependence of the cross-correlation in more detail, using up to 8 energy bins over a wide energy range of [0.25-500] GeV. Secondly, we consider larger and deeper catalogs (2MASS Photometric-Redshift catalog, 2MPZ; WISE x SuperCOSMOS, WISC; and SDSS-DR12 photometric-redshift dataset) in addition to the ones employed in the previous studies (NVSS and SDSS-QSOs). Thirdly, we exploit the redshift information available for the above catalogs to divide them into redshift bins and perform the cross-correlation separately in each of them. Our results confirm, with higher statistical significance, the detection of cross-correlation signal between the UGRB maps and all the catalogs considered, on angular scales smaller than 1 degree. Significances range from 16.3 sigma for NVSS, 7 sigma for SDSS-DR12 and WISC, 5 sigma for 2MPZ and 4 sigma for SDSS-QSOs. Furthermore, including redshift tomography, the significance of the SDSS-DR12 signal strikingly rises up to 12 sigma and the one of WISC to 10.6 sigma. We offer a simple interpretation of the signal in the framework of the halo model. The precise redshift and energy information allows us to clearly detect a change over redshift in the spectral and clustering behavior of the gamma-ray sources contributing to the UGRB.

arXiv comment19 pages, 18 figures, 3 tables + 2 appendices; Published in ApJS

References in corpus (72)

• Planck 2015 results. XIII. Cosmological parameters
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Efficient Computation of CMB anisotropies in closed FRW models
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• Stable clustering, the halo model and nonlinear cosmological power spectra
• Halo Models of Large Scale Structure
• The Eighth Data Release of the Sloan Digital Sky Survey: First Data from SDSS-III
• Revising the Halofit Model for the Nonlinear Matter Power Spectrum
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• 2MASS Extended Source Catalog: Overview and Algorithms
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium
• Galaxy And Mass Assembly (GAMA): end of survey report and data release 2
• Planck 2013 results. XV. CMB power spectra and likelihood
• Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of Fermi Large Area Telescope Data
• The Sunyaev-Zel'dovich angular power spectrum as a probe of cosmological parameters
• GeV Observations of Star-forming Galaxies with \textit{Fermi} LAT
• Efficient Photometric Selection of Quasars from the Sloan Digital Sky Survey: II. ~1,000,000 Quasars from Data Release Six
• Radio and Millimeter Continuum Surveys and their Astrophysical Implications
• 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
• 2MASS Photometric Redshift catalog: a comprehensive three-dimensional census of the whole sky
• Myths and Truths Concerning Estimation of Power Spectra
• The Origin of the Extragalactic Gamma-Ray Background and Implications for Dark-Matter Annihilation
• Photometric redshifts for the SDSS Data Release 12
• Resolving the Extragalactic $\gamma$-ray Background above 50 GeV with Fermi-LAT
• Contribution of the Gamma-ray Loud Radio Galaxies Core Emissions to the Cosmic MeV and GeV Gamma-Ray Background Radiation
• A Maximum Likelihood Analysis of the Low CMB Multipoles from WMAP
• Anisotropy of the cosmic gamma-ray background from dark matter annihilation
• The radio/gamma-ray connection in Active Galactic Nuclei in the era of the Fermi Large Area Telescope
• The nature of the Diffuse Gamma-Ray Background
• WISE x SuperCOSMOS photometric redshift catalog: 20 million galaxies over 3pi steradians
• Diffuse $\gamma$-ray emission from misaligned active galactic nuclei
• Anisotropies in the diffuse gamma-ray background measured by the Fermi LAT
• A Comparison of Six Photometric Redshift Methods Applied to 1.5 Million Luminous Red Galaxies
• Large Scale Structure in the Local Universe: The 2MASS Galaxy Catalog
• Statistics of gamma-ray point sources below the Fermi detection limit
• Homogeneity and isotropy in the 2MASS Photometric Redshift catalogue
• Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background
• Diffuse $\gamma$-ray emission from unresolved BL Lac objects
• Error analysis of quadratic power spectrum estimates for CMB polarization: sampling covariance
• Constraints on the annihilation cross section of dark matter particles from anisotropies in the diffuse gamma-ray background measured with Fermi-LAT
• Gamma-ray background anisotropy from galactic dark matter substructure
• A Combined EIS-NVSS Survey Of Radio Sources (CENSORS) III: Spectroscopic observations
• Cross-Correlation of Cosmic Shear and Extragalactic Gamma-ray Background: Constraints on the Dark Matter Annihilation Cross-Section
• Tomography of the Fermi-LAT gamma-ray diffuse extragalactic signal via cross-correlations with galaxy catalogs
• Dark matter searches in the gamma-ray extragalactic background via cross-correlations with galaxy catalogues
• 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
• Particle dark matter searches in the anisotropic sky
• Characterization of Dark-Matter-induced anisotropies in the diffuse gamma-ray background
• Deciphering Contributions to the Extragalactic Gamma-Ray Background from 2 GeV to 2 TeV
• Mapping dark matter in the gamma-ray sky with galaxy catalogs
• ISW measurements with photometric redshift surveys: 2MASS results and future prospects
• Particle dark matter searches outside the Local Group
• The High Redshift Integrated Sachs-Wolfe Effect
• Unveiling the Gamma-ray Source Count Distribution Below the Fermi Detection Limit with Photon Statistics
• A cross-correlation study of the Fermi-LAT $\gamma$-ray diffuse extragalactic signal
• Models of the Contribution of Blazars to the Anisotropy of the Extragalactic Diffuse Gamma-ray Background
• Tomographic-spectral approach for dark matter detection in the cross-correlation between cosmic shear and diffuse gamma-ray emission
• Evidence of cross-correlation between the CMB lensing and the gamma-ray sky
• Cross-correlating the gamma-ray sky with catalogs of galaxy clusters
• Statistical Measurement of the Gamma-ray Source-count Distribution as a Function of Energy
• Power spectrum tomography of dark matter annihilation with local galaxy distribution
• Cross-correlation of weak lensing and gamma rays: implications for the nature of dark matter
• The SuperCOSMOS all-sky galaxy catalogue
• Identifying Dark Matter Annihilation Products In The Diffuse Gamma Ray Background
• Fermi-LAT gamma-ray anisotropy and intensity explained by unresolved Radio-Loud Active Galactic Nuclei
• Cosmological constraints on dark matter annihilation and decay: Cross-correlation analysis of the extragalactic $\gamma$-ray background and cosmic shear
• Planck Lensing and Cosmic Infrared Background Cross-Correlation with Fermi-LAT: Tracing Dark Matter Signals in the Gamma-Ray Background

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• An Updated Tomographic Analysis of the Integrated Sachs-Wolfe Effect and implications for Dark Energy
• Cross-correlating galaxy catalogs and gravitational waves: a tomographic approach
• Photometric selection and redshifts for quasars in the Kilo-Degree Survey Data Release 4
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• The correlation of extragalactic $\gamma$-rays with cosmic matter density distributions from weak-gravitational lensing
• Measurement of redshift dependent cross correlation of HSC clusters and Fermi $\gamma$ rays
• Stellar Mass and Star Formation Rate within a Billion Light-Years
• 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
• Got plenty of nothing: cosmic voids as a probe of particle dark matter
• Constraints on dark matter and astrophysics from tomographic $\gamma$-ray cross-correlations
• Constraints on Running of Non-Gaussianity from Large Scale Structure Probes
• High-Significance Detection of Correlation Between the Unresolved Gamma-Ray Background and the Large Scale Cosmic Structure
• 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