Résumé
Aims. Observations of Kepler's supernova remnant (G4.5+6.8) with the HESS telescope array in 2004 and 2005 with a total live time of 13 h are presented.Methods. Stereoscopic imaging of Cherenkov radiation from extensive air showers is used to reconstruct the energy and direction of the incident gamma rays.Results. No evidence for a very high energy (VHE: $]]>100 GeV) gamma-ray signal from the direction of the remnant is found. An upper limit (99% confidence level) on the energy flux in the range of is obtained.Conclusions. In the context of an existing theoretical model for the remnant, the lack of a detectable gamma-ray flux implies a distance of at least . A corresponding upper limit for the density of the ambient matter of is derived. With this distance limit, and assuming a spectral index , the total energy in accelerated protons is limited to . In the synchrotron/inverse Compton framework, extrapolating the power law measured by RXTE between and down in energy, the predicted gamma-ray flux from inverse Compton scattering is below the measured upper limit for magnetic field values greater than .
| langue originale | Anglais |
|---|---|
| Pages (de - à) | 219-223 |
| Nombre de pages | 5 |
| journal | Astronomy and Astrophysics |
| Volume | 488 |
| Numéro de publication | 1 |
| Les DOIs | |
| état | Publié - 1 janv. 2008 |
| Modification externe | Oui |
Empreinte digitale
Examiner les sujets de recherche de « HESS upper limits for Kepler's supernova remnant ». Ensemble, ils forment une empreinte digitale unique.Contient cette citation
- APA
- Author
- BIBTEX
- Harvard
- Standard
- RIS
- Vancouver