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Durham University

Department of Physics

Staff profile

Publication details for Prof David Alexander

Donley, J. L., Kartaltepe, J., Kocevski, D., Salvato, M., Santini, P., Suh, H., Civano, F., Koekemoer, A. M., Trump, J., Brusa, M., Cardamone, C., Castro, A., Cisternas, M., Conselice, C., Croton, D., Hathi, N., Liu, C., Lucas, R. A., Nair, P., Rosario, D., Sanders, D., Simmons, B., Villforth, C., Alexander, D. M., Bell, E. F., Faber, S. M., Grogin, N. A., Lotz, J., McIntosh, D. H. & Nagao, T. (2018). Evidence for Merger-driven Growth in Luminous, High-z, Obscured AGNs in the CANDELS/COSMOS Field. The Astrophysical Journal 853(1): 63.

Author(s) from Durham


We report the detection of GeV γ-ray emission from supernova remnant HESS J1731-347 using 9 yr of Fermi Large Area Telescope data. We find a slightly extended GeV source in the direction of HESS J1731-347. The spectrum above 1 GeV can be fitted by a power law with an index of Γ = 1.77 ± 0.14, and the GeV spectrum connects smoothly with the TeV spectrum of HESS J1731-347. Either a hadronic–leptonic or a pure leptonic model can fit the multiwavelength spectral energy distribution of the source. However, the hard GeV γ-ray spectrum is more naturally produced in a leptonic (inverse Compton scattering) scenario, under the framework of diffusive shock acceleration. We also searched for the GeV γ-ray emission from the nearby TeV source HESS J1729-345. No significant GeV γ-ray emission is found, and upper limits are derived.