ALP Conversion and the Soft X-ray Excess in the Outskirts of the Coma Cluster
arXiv:1406.5188 · doi:10.1088/1475-7516/2015/01/011
Abstract
It was recently found that the soft X-ray excess in the center of the Coma cluster can be fitted by conversion of axion-like-particles (ALPs) of a cosmic axion background (CAB) to photons. We extend this analysis to the outskirts of Coma, including regions up to 5 Mpc from the center of the cluster. We extract the excess soft X-ray flux from ROSAT All-Sky Survey data and compare it to the expected flux from ALP to photon conversion of a CAB. The soft X-ray excess both in the center and the outskirts of Coma can be simultaneously fitted by ALP to photon conversion of a CAB. Given the uncertainties of the cluster magnetic field in the outskirts we constrain the parameter space of the CAB. In particular, an upper limit on the CAB mean energy and a range of allowed ALP-photon couplings are derived.
arXiv comment21 pages, 7 figures
References in corpus (51)
- Planck 2013 results. XVI. Cosmological parameters
- The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
- Chandra sample of nearby relaxed galaxy clusters: mass, gas fraction, and mass-temperature relation
- Systematics of Moduli Stabilisation in Calabi-Yau Flux Compactifications
- WISPy Cold Dark Matter
- The Coma cluster magnetic field from Faraday rotation measures
- Evidence for a new light spin-zero boson from cosmological gamma-ray propagation?
- Magnetic Fields and Faraday Rotation in Clusters of Galaxies
- X-Ray surface brightness and gas density fluctuations in the Coma cluster
- The diffuse radio emission from the Coma cluster at 2.675 GHz and 4.85 GHz
- Dark Radiation in LARGE Volume Models
- Stringy corrections to Kahler potentials, SUSY breaking, and the cosmological constant problem
- Gamma Rays from SN1987A due to Pseudoscalar Conversion
- SN 1987A Gamma-Ray Limits on the Conversion of Pseudoscalars
- Search for cosmic-ray induced gamma-ray emission in Galaxy Clusters
- GeV Gamma-ray Flux Upper Limits from Clusters of Galaxies
- A Faraday Rotation Search for Magnetic Fields in Large Scale Structure
- The Quest for an Intermediate-Scale Accidental Axion and Further ALPs
- A thermally stable heating mechanism for the intracluster medium: turbulence, magnetic fields and plasma instabilities
- The dynamical state of the Coma cluster with XMM-Newton
- Evidence for Shock Acceleration and Intergalactic Magnetic Fields in a Large-Scale Filament of Galaxies ZwCl 2341.1+0000
- Dark Radiation and Dark Matter in Large Volume Compactifications
- Confirmation of non-thermal hard X-ray excess in the Coma cluster from two epoch observations
- Constraining the Axion-Photon Coupling with Massive Stars
- The NGC4839 group falling into the Coma cluster observed by XMM-Newton
- Measurements and simulation of Faraday rotation across the Coma radio relic
- The intracluster magnetic field power spectrum in A2199
- Searching for a 0.1-1 keV Cosmic Axion Background
- Fermi-LAT constraints on dark matter annihilation cross section from observations of the Fornax cluster
- Constraining Extended Gamma-ray Emission from Galaxy Clusters
- Evidence for extended gamma-ray emission from galaxy clusters
- Thermodynamics of the Coma Cluster Outskirts
- Magnetic power spectra from Faraday rotation maps - REALMAF and its use on Hydra A
- Constraints on diffuse gamma-ray emission from structure formation processes in the Coma cluster
- Moduli-Induced Axion Problem
- Probing the cosmic-ray content of galaxy clusters by stacking Fermi-LAT count maps
- Fractional polarization and magnetic fields in the ICM
- The Cosmophenomenology of Axionic Dark Radiation
- Discovery of new faint radio emission on 8$\arcdeg$ to 3$\arcmin$ scales in the Coma field, and some Galactic and extragalactic implications
- The soft X-ray emission in a large sample of galaxy clusters with ROSAT PSPC
- A massive warm baryonic halo in the Coma cluster
- New polarimetric constraints on axion-like particles
- Dark Radiation predictions from general Large Volume Scenarios
- EUV images of the Clusters of Galaxies A2199 and A1795: clear evidence for a separate and luminous emission component
- Soft X-ray and extreme ultraviolet excess emission from clusters of galaxies
- Dark Radiation in Anisotropic LARGE Volume Compactifications
- Limits on Far-UV Emission from Warm Gas in Clusters of Galaxies with the Hopkins Ultraviolet Telescope
- FUSE Limits on FUV Emission from Warm Gas in Clusters of Galaxies
- The diffuse soft excess emission in the Coma cluster from the ROSAT All-Sky Survey
- Loop corrections to Delta N_eff in large volume models
- Constraints on the average magnetic field strength of relic radio sources 0917+75 and 1401-33 from XMM-Newton observations
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- Physics potential of the International Axion Observatory (IAXO)
- Behavior of axion-like particles in smoothed out domain-like magnetic fields
- Axion-like Particles Implications for High-Energy Astrophysics
- A Cosmic ALP Background and the Cluster Soft X-ray Excess in A665, A2199 and A2255
- Searching for Axion-Like Particles from Core-Collapse Supernovae with Fermi LAT's Low Energy Technique
- Cosmic axion background propagation in galaxies
- Anisotropies in Non-Thermal Distortions of Cosmic Light from Photon-Axion Conversion
- (O)Mega Split
- Active galactic nuclei through the prism of galaxy clusters: bounds on axion-like particles
- Sensitivity to Axion-like Particle dark matter with very-high-energy gamma-ray observations of Active Galactic Nuclei located behind Galaxy Clusters