Deeper H.E.S.S. observations of Vela Junior (RX J0852.0−4622): morphology studies and resolved spectroscopy
<i>Aims.<i/> We study <i>γ<i/>-ray emission from the shell-type supernova remnant (SNR) RX J0852.0−4622 to better characterize its spectral properties and its distribution over the SNR.<i>Methods.<i/> The analysis of an extended High Energy Spectroscopic System (H...
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| Main Authors: | , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
09 April 2018
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| In: |
Astronomy and astrophysics
Year: 2018, Volume: 612 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201630002 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1051/0004-6361/201630002 Verlag, Volltext: https://www.aanda.org/articles/aa/abs/2018/04/aa30002-16/aa30002-16.html 
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| Author Notes: | H.E.S.S. Collaboration: H. Abdalla, G. Cologna, F. Jankowsky, M. Mohamed, Quirrenbach, F. Rieger, S. Schwemmer, S.J. Wagner [und weitere] |
| Summary: | <i>Aims.<i/> We study <i>γ<i/>-ray emission from the shell-type supernova remnant (SNR) RX J0852.0−4622 to better characterize its spectral properties and its distribution over the SNR.<i>Methods.<i/> The analysis of an extended High Energy Spectroscopic System (H.E.S.S.) data set at very high energies (<i>E<i/> > 100 GeV) permits detailed studies, as well as spatially resolved spectroscopy, of the morphology and spectrum of the whole RX J0852.0−4622 region. The H.E.S.S. data are combined with archival data from other wavebands and interpreted in the framework of leptonic and hadronic models. The joint <i>Fermi<i/>-LAT-H.E.S.S. spectrum allows the direct determination of the spectral characteristics of the parent particle population in leptonic and hadronic scenarios using only GeV-TeV data.<i>Results.<i/> An updated analysis of the H.E.S.S. data shows that the spectrum of the entire SNR connects smoothly to the high-energy spectrum measured by <i>Fermi<i/>-LAT. The increased data set makes it possible to demonstrate that the H.E.S.S. spectrum deviates significantly from a power law and is well described by both a curved power law and a power law with an exponential cutoff at an energy of <i>E<i/><sub>cut<sub/> = (6.7 ± 1.2<sub>stat<sub/> ± 1.2<sub>syst<sub/>) TeV. The joint <i>Fermi<i/>-LAT-H.E.S.S. spectrum allows the unambiguous identification of the spectral shape as a power law with an exponential cutoff. No significant evidence is found for a variation of the spectral parameters across the SNR, suggesting similar conditions of particle acceleration across the remnant. A simple modeling using one particle population to model the SNR emission demonstrates that both leptonic and hadronic emission scenarios remain plausible. It is also shown that at least a part of the shell emission is likely due to the presence of a pulsar wind nebula around PSR J0855−4644. |
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| Item Description: | Gesehen am 14.06.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201630002 |