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Evidence for merger-driven growth in luminous, high-z, obscured AGNs in the CANDELS/COSMOS field.

Donley, J. L. and Kartaltepe, J. and Kocevski, D. and Salvato, M. and Santini, P. and Suh, H. and Civano, F. and Koekemoer, A. M. and Trump, J. and Brusa, M. and Cardamone, C. and Castro, A. and Cisternas, M. and Conselice, C. and Croton, D. and Hathi, N. and Liu, C. and Lucas, R. A. and Nair, P. and Rosario, D. and Sanders, D. and Simmons, B. and Villforth, C. and Alexander, D. M. and Bell, E. F. and Faber, S. M. and Grogin, N. A. and Lotz, J. and McIntosh, D. H. and Nagao, T. (2018) 'Evidence for merger-driven growth in luminous, high-z, obscured AGNs in the CANDELS/COSMOS field.', Astrophysical journal., 853 (1). p. 63.


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.

Item Type:Article
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Publisher statement:© 2018. The American Astronomical Society. All rights reserved.
Date accepted:04 December 2017
Date deposited:08 February 2018
Date of first online publication:23 January 2018
Date first made open access:08 February 2018

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