期刊
ASTRONOMY & ASTROPHYSICS
卷 621, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201834335
关键词
gamma rays: general; acceleration of particles; convection; diffusion; pulsars: general
资金
- German Ministry for Education and Research (BMBF)
- Max Planck Society
- German Research Foundation (DFG)
- Helmholtz Association
- Alexander von Humboldt Foundation
- French Ministry of Higher Education, Research and Innovation
- Centre National de la Recherche Scientifique (CNRS/IN2P3)
- Commissariat a l'energie atomique et aux energies alternatives (CEA)
- UK Science and Technology Facilities Council (STFC)
- Knut and Alice Wallenberg Foundation
- National Science Centre, Poland [2016/22/M/ST9/00382]
- South African Department of Science and Technology
- National Research Foundation
- University of Namibia
- National Commission on Research, Science& Technology of Namibia (NCRST)
- Austrian Federal Ministry of Education, Science and Research
- Austrian Science Fund (FWF)
- Australian Research Council (ARC)
- Japan Society for the Promotion of Science
- University of Amsterdam
- Centre National de la Recherche Scientifique (CNRS/INSU)
Context. We present a detailed view of the pulsar wind nebula (PWN) HESS J1825-137. We aim to constrain the mechanisms dominating the particle transport within the nebula, accounting for its anomalously large size and spectral characteristics. Aims. The nebula was studied using a deep exposure from over 12 years of H.E.S.S. I operation, together with data from H.E.S.S. II that improve the low-energy sensitivity. Enhanced energy-dependent morphological and spatially resolved spectral analyses probe the very high energy (VHE, E > 0.1 TeV) gamma-ray properties of the nebula. Methods. The nebula emission is revealed to extend out to 1.5 degrees from the pulsar, similar to 1.5 times farther than previously seen, making HESS J1825-137, with an intrinsic diameter of similar to 100 pc, potentially the largest gamma-ray PWN currently known. Characterising the strongly energy-dependent morphology of the nebula enables us to constrain the particle transport mechanisms. A dependence of the nebula extent with energy of R proportional to E alpha with alpha = -0.29 +/- 0.04(stat) +/- 0.05(sys) disfavours a pure diffusion scenario for particle transport within the nebula. The total gamma-ray flux of the nebula above 1 TeV is found to be (1.12 +/- 0.03(stat) +/- 0.25(sys)) +/- 10(-11) cm(-2) s(-1), corresponding to similar to 64% of the flux of the Crab nebula. Results. HESS J1825-137 is a PWN with clearly energy-dependent morphology at VHE gamma-ray energies. This source is used as a laboratory to investigate particle transport within intermediate-age PWNe. Based on deep observations of this highly spatially extended PWN, we produce a spectral map of the region that provides insights into the spectral variation within the nebula.
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