Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-20
Astronomy and Astrophysics
Astrophysics
Proceedings of the International Cosmic Ray Conference 2007, Merida Yucatan, Mexico
Scientific paper
Observations with H.E.S.S. revealed a new source of very high-energy (VHE) gamma-rays above 100 GeV - HESS J1825-137 - extending mainly to the south of the energetic pulsar PSR B1823-13. A detailed spectral and morphological analysis of HESS J1825-137 reveals for the first time in VHE gamma-ray astronomy a steepening of the energy spectrum with increasing distance from the pulsar. This behaviour can be understood by invoking radiative cooling of the IC-Compton gamma-ray emitting electrons during their propagation. In this scenario the vastly different sizes between the VHE gamma-ray emitting region and the X-ray PWN associated with PSR B1823-13 can be naturally explained by different cooling timescales for the radiating electron populations. If this scenario is correct, HESS J1825-137 can serve as a prototype for a whole class of asymmetric PWN in which the X-rays are extended over a much smaller angular scales than the gamma-rays and can help understanding recent detections of X-ray PWN in systems such as HESS J1640-465 and HESS J1813-178. The future GLAST satellite will probe lower electron energies shedding further light on cooling and diffusion processes in this source.
deJager Okker C.
Funk The H. E. S. S. Collaboration: S.
Hinton Jim A.
No associations
LandOfFree
Energy Dependent Morphology in the PWN candidate HESS J1825-137 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Energy Dependent Morphology in the PWN candidate HESS J1825-137, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy Dependent Morphology in the PWN candidate HESS J1825-137 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-517536