Search for GeV Gamma-Ray Emission from SPT-SZ selected Galaxy Clusters with 15 years of Fermi-LAT data

Abstract

Galaxy clusters could produce gamma-rays from inverse Compton scattering of cosmic ray electrons or hadronic interactions of cosmic ray protons with the intracluster medium. It is still an open question on whether gamma-ray emission ($>$ GeV energies) has been detected from galaxy clusters. We carry out a systematic search for gamma-ray mission based on 300 galaxy clusters selected from the 2500 deg.${}^2$ SPT-SZ survey after sorting them in descending order of $M_{500}/z^2$, using about 15 years of Fermi-LAT data in the energy range between 1-300 GeV. We were able to detect gamma-ray emission with significance of about $6.1\sigma$ from one cluster, viz SPT-CL J2012-5649. The estimated photon energy flux from this cluster is approximately equal to $1.3\times 10^{-6}$ MeV cm${}^{-2}$ s${}^{-1}$. The gamma-ray signal is observed between $1-10$ GeV with the best-fit spectral index equal to $-3.61\pm 0.33$. However, since there are six radio galaxies spatially coincident with SPT-CL J2012-5649 within the Fermi-LAT PSF, we cannot rule out the possibility this signal could be caused by some of these radio galaxies. Six other SPT-SZ clusters show evidence for gamma-ray emission with significance between $3-5\sigma$. None of the remaining clusters show statistically significant evidence for gamma-ray emission.

17 pages, 20 figures. Accepted for publication in JCAP

References in corpus (28)

• A direct empirical proof of the existence of dark matter
• Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
• SPT-3G: A Next-Generation Cosmic Microwave Background Polarization Experiment on the South Pole Telescope
• Statistics of X-ray observables for the cooling-core and non-cooling core galaxy clusters
• NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission
• The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics and Data Release
• Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects
• Constraints on Dark Matter Annihilation in Clusters of Galaxies with the Fermi Large Area Telescope
• Redshifts, Sample Purity, and BCG Positions for the Galaxy Cluster Catalog from the first 720 Square Degrees of the South Pole Telescope Survey
• Relativistic protons in the Coma galaxy cluster: first gamma-ray constraints ever on turbulent reacceleration
• Constraining Extended Gamma-ray Emission from Galaxy Clusters
• MeerKAT view of the diffuse radio sources in Abell 3667 and their interactions with the thermal plasma
• Cross-correlating the gamma-ray sky with catalogs of galaxy clusters
• Fermi Large Area Telescope Fourth Source Catalog Data Release 4 (4FGL-DR4)
• A test of cosmic distance duality relation using SPT-SZ galaxy clusters, Type Ia supernovae, and cosmic chronometers
• New Limits On Gamma-Ray Emission From Galaxy Clusters
• Constraints on neutrino masses from the study of the nearby large-scale structure and galaxy cluster counts
• Constraining the dark matter contribution of $\gamma$ rays in Cluster of galaxies using Fermi-LAT data
• Early Science with the Karoo Array Telescope: a Mini-Halo Candidate in Galaxy Cluster Abell 3667
• Gamma-ray emission associated with Cluster-scale AGN Outbursts
• The El Gordo galaxy cluster challenges ΛCDM for any plausible collision velocity
• Detailed study of extended gamma-ray morphology in the vicinity of the Coma cluster with Fermi-LAT
• Constraining decaying very heavy dark matter from galaxy clusters with 14 year Fermi-LAT data
• The Diffuse Gamma-Ray Flux from Clusters of Galaxies
• Exploring diffuse radio emission in galaxy clusters and groups with the uGMRT and the SKA
• A test of the standard dark matter density evolution law using galaxy clusters and cosmic chronometers
• Search for spatial coincidence between IceCube neutrinos and radio pulsars
• Gamma Rays from Star Formation in Clusters of Galaxies

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• uGMRT and MeerKAT observation of RXCJ0232-4420: a quiet cluster with a giant radio halo
• A MINOT-based Study of Gamma-ray emission from SPT-CL J2012-5649/Abell 3667