Cross-Correlation between UHECR Arrival Distribution and Large-Scale Structure

Abstract

We investigate correlation between the arrival directions of ultra-high-energy cosmic rays (UHECRs) and the large-scale structure (LSS) of the Universe by using statistical quantities which can find the angular scale of the correlation. The Infrared Astronomical Satellite Point Source Redshift Survey (IRAS PSCz) catalog of galaxies is adopted for LSS. We find a positive correlation of the highest energy events detected by the Pierre Auger Observatory (PAO) with the IRAS galaxies inside $z=0.018$ within the angular scale of $\sim 15^{\circ }$. This positive correlation observed in the southern sky implies that a significant fraction of the highest energy events comes from nearby extragalactic objects. We also analyze the data of the Akeno Giant Air Shower Array (AGASA) which observed the northern hemisphere, but the obvious signals of positive correlation with the galaxy distribution are not found. Since the exposure of the AGASA is smaller than the PAO, the cross-correlation in the northern sky should be tested using a larger number of events detected in the future. We also discuss the correlation using the all-sky combined data sets of both the PAO and AGASA, and find a significant correlation within $\sim 8^{\circ }$. These angular scales can constrain several models of intergalactic magnetic field. These cross-correlation signals can be well reproduced by a source model in which the distribution of UHECR sources is related to the IRAS galaxies.

21 pages,7 figures

References in corpus (50)

• Correlation of the highest energy cosmic rays with nearby extragalactic objects
• Observation of the suppression of the flux of cosmic rays above 4x10^19eV
• The PSCz Catalogue
• Small-scale anisotropy of cosmic rays above 10^19eV observed with the Akeno Giant Air Shower Array
• Monte-Carlo simulations of photohadronic processes in astrophysics
• Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
• Energy determination in the Akeno Giant Air Shower Array experiment
• Constrained Simulations of the Magnetic Field in the Local Universe and the Propagation of UHECRs
• Dip in UHECR spectrum as signature of proton interaction with CMB
• Ultra high energy cosmic rays and the large scale structure of the galactic magnetic field
• Ultra-High Energy Cosmic Ray Probes of Large Scale Structure and Magnetic Fields
• Cosmic Ray Anisotropy Analysis with a Full-Sky Observatory
• The arrival directions of the most energetic cosmic rays
• A dip in the UHECR spectrum and the transition from galactic to extragalactic cosmic rays
• Cluster Analysis of Extremely High Energy Cosmic Rays in the Northern Sky
• BL Lacertae are probable sources of the observed ultra-high energy cosmic rays
• Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei
• Tracing protons through the Galactic magnetic field: a clue for charge composition of ultra-high energy cosmic rays
• Caltech Faint Galaxy Redshift Survey XIV: Galaxy Morphology in the HDF (North) and its Flanking Fields to z=1.2
• Transition from galactic to extragalactic cosmic rays
• Search for Cross-Correlations of Ultra--High-Energy Cosmic Rays with BL Lacertae Objects
• Searching for a Correlation Between Cosmic-Ray Sources Above 10^{19} eV and Large-Scale Structure
• Propagation of UHE Protons through Magnetized Cosmic Web
• The Galactic magnetic field as spectrograph for ultra-high energy cosmic rays
• Evidence for a connection between the gamma-ray and the highest energy cosmic-ray emissions by BL Lacertae objects
• The Signature of a Correlation between $>10^{19}\mathrm{eV}$ Cosmic Ray Sources and Large Scale Structure
• UHECR propagation in the Galaxy: clustering versus isotropy
• Ultra-High Energy Cosmic Rays, Spiral galaxies and Magnetars
• Muon content of ultra-high-energy air showers: Yakutsk data versus simulations
• Comment on "Correlation of the Highest-Energy Cosmic Rays with Nearby Extragalactic Objects"
• On the Possible Association of Ultra High Energy Cosmic Rays with Nearby Active Galaxies
• Small Scale Clustering in the Isotropic Arrival Distribution of Ultra-High Energy Cosmic Rays and Implications for Their Source Candidates
• On Active Galactic Nuclei as Sources of Ultra-High Energy Cosmic Rays
• Study of the Cosmic Ray Composition above 0.4 EeV using the Longitudinal Profiles of Showers observed at the Pierre Auger Observatory
• Deflection of ultra high energy cosmic rays by the galactic magnetic field: from the sources to the detector
• Propagation of Ultra-High Energy Cosmic Rays above $10^{19}$ eV in a Structured Extragalactic Magnetic Field and Galactic Magnetic Field
• On the cross-correlation of sub-mm sources and optically-selected galaxies
• Search for Point Sources of Ultra-High Energy Cosmic Rays Above 40 EeV Using a Maximum Likelihood Ratio Test
• Distortion of Ultra-high-energy sky by Galactic Magnetic Field
• Implications to Sources of Ultra-high-energy Cosmic Rays from their Arrival Distribution
• Hybrid Performance of the Pierre Auger Observatory
• Arrival Distribution of Ultra-High Energy Cosmic Rays: Prospects for the Future
• On the interpretation of the cosmic-ray anisotropy at ultra-high energies
• A comparative study of correlations between arrival directions of ultra-high-energy cosmic rays and positions of their potential astrophysical sources
• Luminous infrared galaxies as possible sources of the UHE cosmic rays
• Constraints on Large-Scale Magnetic Fields from the Auger Results
• Gamma-Ray Bursts and Magnetars as Possible Sources of Ultra High Energy Cosmic Rays: Correlation of Cosmic Ray Event Positions with IRAS Galaxies
• Towards unravelling the structural distribution of ultra-high-energy cosmic ray sources
• Search for Point-Like Sources of Cosmic Rays with Energies above 10^18.5 eV in the HiRes-I Monocular Data-Set
• Search for Correlations between Nearby AGNs and Ultra-high Energy Cosmic Rays

Cited by in corpus (19)

• Cosmic Rays from the Knee to the Highest Energies
• Heavy Nuclei Synthesized in Gamma-Ray Burst Outflows as the Source of UHECRs
• Radio Quiet AGNs as Possible Sources of Ultra-high Energy Cosmic Rays
• Testing large-scale (an)isotropy of ultra-high energy cosmic rays
• The Role of Structured Magnetic Fields on Constraining Properties of Transient Sources of Ultra-high-energy Cosmic Rays
• Exploring the Intergalactic Magnetic Field by Means of Faraday Tomography
• Does Galactic Magnetic Field Disturb the Correlation of the Highest Energy Cosmic Rays with their Sources?
• The Centaurus A Ultrahigh-Energy Cosmic Ray Excess and the Local Extragalactic Magnetic Field
• Propagation of Ultra-High-Energy Cosmic Ray Nuclei in Cosmic Magnetic Fields and Implications for Anisotropy Measurements
• Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
• Statistical Analysis of the Correlation between Active Galactic Nuclei and Ultra-High Energy Cosmic Rays
• Isotropy constraints on powerful sources of ultrahigh-energy cosmic rays at $10^{19}$ eV
• A Search for Correlation of Ultra-High Energy Cosmic Rays with IRAS-PSCz and 2MASS-6dF Galaxies
• Search for a correlation between ANTARES neutrinos and Pierre Auger Observatory UHECRs arrival directions
• Detecting ultra-high energy cosmic ray anisotropies through cross-correlations
• Centaurus A as a point source of Ultra-High Energy Cosmic Rays
• Revisit of Correlation Analysis between Active Galactic Nuclei and Ultra-High Energy Cosmic Rays
• Constraints on Physical Conditions for the Acceleration on Ultra-high-energy Cosmic Rays in Nearby Active Galactic Nuclei Observed with the Fermi Large Area Telescope
• Note on galaxy catalogues in UHECR flux modelling