期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 424, 期 1, 页码 128-135出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2012.21180.x
关键词
acceleration of particles; radiation mechanisms: non-thermal; ISM: individual objects: Carina nebula; ISM: individual objects: Eta Carina; open clusters and associations: general; X-rays: binaries
资金
- German Ministry for Education and Research (BMBF)
- Max Planck Society
- German Research Foundation (DFG)
- French Ministry for Research
- CNRS-IN2P3
- CNRS
- UK Science and Technology Facilities Council (STFC)
- IPNP of the Charles University
- Czech Science Foundation
- Polish Ministry of Science and Higher Education
- South African Department of Science and Technology
- National Research Foundation
- University of Namibia
- Humboldt Foundation
- STFC [ST/G00790X/2] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E001645/2, ST/G00790X/2, PP/E001319/1, ST/I001573/1, ST/I505656/1] Funding Source: researchfish
The massive binary system Eta Carinae and the surrounding H ii complex, the Carina nebula, are potential particle acceleration sites from which very high energy (VHE; E= 100 GeV) ?-ray emission could be expected. This paper presents data collected during VHE ?-ray observations with the HESS telescope array from 2004 to 2010, which cover a full orbit of Eta Carinae. In the 33.1-h data set no hint of significant ?-ray emission from Eta Carinae has been found and an upper limit on the ?-ray flux of (99 per cent confidence level) is derived above the energy threshold of 470 GeV. Together with the detection of high energy (HE; 0.1 =E= 100 GeV) ?-ray emission by the Fermi Large Area Telescope up to 100 GeV, and assuming a continuation of the average HE spectral index into the VHE domain, these results imply a cut-off in the ?-ray spectrum between the HE and VHE ?-ray range. This could be caused either by a cut-off in the accelerated particle distribution or by severe ?? absorption losses in the wind collision region. Furthermore, the search for extended ?-ray emission from the Carina nebula resulted in an upper limit on the ?-ray flux of (99 per cent confidence level). The derived upper limit of 23 on the cosmic ray enhancement factor is compared with results found for the old-age mixed-morphology supernova remnant W28.
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