Deeper H.E.S.S. observations of Vela Junior (RX J0852.0−4622)

• Verfasst von: Abdalla, Hassan [VerfasserIn]
• Verfasst von: Jankowsky, Felix [VerfasserIn]
• Verfasst von: Mohamed, Mahmoud [VerfasserIn]
• Verfasst von: Quirrenbach, Andreas [VerfasserIn]
• Verfasst von: Rieger, Frank M. [VerfasserIn]
• Verfasst von: Schwemmer, Stephanie [VerfasserIn]
• Verfasst von: Wagner, Stefan [VerfasserIn]
• Verfasst von: Cologna, Gabriele [VerfasserIn]
• Titel: Deeper H.E.S.S. observations of Vela Junior (RX J0852.0−4622)
• Titelzusatz: morphology studies and resolved spectroscopy
• Körperschaft: H.E.S.S. Collaboration [VerfasserIn]
• Verf.angabe: H.E.S.S. Collaboration: H. Abdalla, G. Cologna, F. Jankowsky, M. Mohamed, Quirrenbach, F. Rieger, S. Schwemmer, S.J. Wagner [und weitere]
• E-Jahr: 2018
• Jahr: 09 April 2018
• Umfang: 14 S.
• Fussnoten: Gesehen am 14.06.2019
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2018
• Band/Heft Quelle: 612(2018) Artikel-Nummer A7, 14 Seiten
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/201630002
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1666316539

Abstract

<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.