HESS J1858+020: A GeV-TeV source possibly powered by cosmic rays from SNR G35.6-0.4 Y. Cui, Y. Xin, S. Liu, P. H. T. Tam, G. Pühlhofer and H. Zhu A&A, 646 (2021) A114 Published online: 19 February 2021 DOI: 10.1051/0004-6361/202039041