Papers › A pilot search for MeV gamma-ray emission from five galaxy clusters using archival COMPTEL data
A pilot search for MeV gamma-ray emission from five galaxy clusters using archival COMPTEL data
Siddhant Manna, Shantanu Desai
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We search for MeV gamma-ray emission between 0.75-30 MeV from five galaxy clusters, viz. Coma, VIRGO, SPT-CL J2012-5649, Bullet, and El Gordo, using archival data from the COMPTEL telescope. For this purpose we use three search templates: point source, radial disk and radial Gaussian. We do not detect any signals from Coma, SPT-CL J2012-5649, Bullet and El Gordo clusters with the 95% c.l. photon energy flux limit ∼10⁻¹⁰ erg /cm²/s. For VIRGO, we detect a non-zero signal between 0.92 to 1.63 MeV having marginal significance of about 2.5σ, with the observed energy flux ∼10⁻⁹ ergs/cm²/s. However, we do not confirm the previously reported evidence in literature for a gamma-ray line from Coma and VIRGO clusters between 5-7 MeV.
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