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Title: Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data

Abstract

We present results from γ-ray observations of the Coma cluster incorporating 6 years of Fermi-LAT data and the newly released “Pass 8” event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the γ-ray flux that is expected from energetic particle interactions in the cluster. We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons. In this case, the median expected and observed upper limits for the flux above 100MeV are 1.7 x 10 -9 ph cm -2 s -1 and 5.2 x 10 -9 ph cm -2 s -1 respectively (the latter corresponds to residual emission at the level of 1:8σ). These bounds are comparable to or higher than predicted levels of hadronic gamma-ray emission in cosmic-ray models with or without reacceleration of secondary electrons, although direct comparisons are sensitive to assumptions regarding the origin and propagation mode of cosmic rays and magnetic field properties. The minimalmore » expected γ-ray flux from radio and star-forming galaxies within the Coma cluster is roughly an order of magnitude below the median sensitivity of our analysis.« less

Authors:
 [1]
  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
The Fermi-LAT Collaboration
OSTI Identifier:
1355684
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 819; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Ackermann, M. Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data. United States: N. p., 2016. Web. doi:10.3847/0004-637X/819/2/149.
Ackermann, M. Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data. United States. doi:10.3847/0004-637X/819/2/149.
Ackermann, M. Tue . "Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data". United States. doi:10.3847/0004-637X/819/2/149. https://www.osti.gov/servlets/purl/1355684.
@article{osti_1355684,
title = {Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data},
author = {Ackermann, M.},
abstractNote = {We present results from γ-ray observations of the Coma cluster incorporating 6 years of Fermi-LAT data and the newly released “Pass 8” event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the γ-ray flux that is expected from energetic particle interactions in the cluster. We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons. In this case, the median expected and observed upper limits for the flux above 100MeV are 1.7 x 10-9 ph cm-2 s-1 and 5.2 x 10-9 ph cm-2 s-1 respectively (the latter corresponds to residual emission at the level of 1:8σ). These bounds are comparable to or higher than predicted levels of hadronic gamma-ray emission in cosmic-ray models with or without reacceleration of secondary electrons, although direct comparisons are sensitive to assumptions regarding the origin and propagation mode of cosmic rays and magnetic field properties. The minimal expected γ-ray flux from radio and star-forming galaxies within the Coma cluster is roughly an order of magnitude below the median sensitivity of our analysis.},
doi = {10.3847/0004-637X/819/2/149},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 819,
place = {United States},
year = {2016},
month = {3}
}

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Cited by: 21 works
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    Works referencing / citing this record:

    Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data
    text, January 2016

    • Ackermann, Markus; Ajello, M.; Albert, A.
    • Deutsches Elektronen-Synchrotron, DESY, Hamburg
    • DOI: 10.3204/pubdb-2016-01711

    Deep observation of the NGC 1275 region with MAGIC: search of diffuse γ -ray emission from cosmic rays in the Perseus cluster
    journal, April 2016


    Manufacturing cosmic rays in the evolving dynamical states of galaxy clusters
    journal, July 2019

    • John, Reju Sam; Paul, Surajit; Iapichino, Luigi
    • Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 1
    • DOI: 10.1093/mnras/stz1785

    Effect of turbulent reacceleration on electrons produced by dark matter annihilation in the Coma cluster
    journal, July 2019

    • Marchegiani, P.
    • Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 1
    • DOI: 10.1093/mnras/stz1798

    Deep observation of the NGC 1275 region with MAGIC: search of diffuse γ -ray emission from cosmic rays in the Perseus cluster
    journal, April 2016


    Manufacturing cosmic rays in the evolving dynamical states of galaxy clusters
    journal, July 2019

    • John, Reju Sam; Paul, Surajit; Iapichino, Luigi
    • Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 1
    • DOI: 10.1093/mnras/stz1785

    Effect of turbulent reacceleration on electrons produced by dark matter annihilation in the Coma cluster
    journal, July 2019

    • Marchegiani, P.
    • Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 1
    • DOI: 10.1093/mnras/stz1798