Home > Publications database > Deeper H.E.S.S. observations of Vela Junior (RX J0852.0−4622): Morphology studies and resolved spectroscopy > print

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005     20250729165629.0
024 7 _ |a 10.1051/0004-6361/201630002
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024 7 _ |a Abdalla:2016ctl
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024 7 _ |a inspire:1495949
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024 7 _ |a 0004-6361
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024 7 _ |a 1432-0746
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024 7 _ |a arXiv:1611.01863
|2 arXiv
024 7 _ |a 10.3204/PUBDB-2019-00149
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037 _ _ |a PUBDB-2019-00149
041 _ _ |a English
082 _ _ |a 520
088 1 _ |a arXiv:1611.01863
088 _ _ |a arXiv:1611.01863
|2 arXiv
100 1 _ |a Abdalla, H.
|b 0
245 _ _ |a Deeper H.E.S.S. observations of Vela Junior (RX J0852.0−4622): Morphology studies and resolved spectroscopy
260 _ _ |a Les Ulis
|c 2018
|b EDP Sciences
336 7 _ |a article
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336 7 _ |a Report
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336 7 _ |a Journal Article
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336 7 _ |a ARTICLE
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336 7 _ |a JOURNAL_ARTICLE
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336 7 _ |a Journal Article
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500 _ _ |a (c) ESO
520 _ _ |a Aims. We study γ-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.Methods. The analysis of an extended High Energy Spectroscopic System (H.E.S.S.) data set at very high energies (E > 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 Fermi-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.Results. 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 Fermi-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 Ecut = (6.7 ± 1.2stat ± 1.2syst) TeV. The joint Fermi-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.Key words: astroparticle physics / gamma rays: general / acceleration of particles / cosmic rays / ISM: supernova remnants★ A FITS image of the region of interest and two text files describingthe H.E.S.S. spectrum of RX J0852.0–4622 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/612/A7† Deceased.
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