Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-15
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, to appear in the Proc. of the 29th International Cosmic Ray Conference, OG Session
Scientific paper
HESS J1825-137 was detected with a significance of 8.1 $\sigma$ in the Galactic Plane survey conducted with the H.E.S.S. instrument in 2004. Both HESS J1825-137 and the X-ray pulsar wind nebula G18.0--0.7 (associated with the Vela-like pulsar PSR B1823-13) are offset south of the pulsar, which may be the result of the SNR expanding into an inhomogeneous medium. The TeV size ($\sim 35$ pc, for a distance of 4 kpc) is $\sim 6$ times larger than the X-ray size, which may be the result of propagation effects as a result of the longer lifetime of TeV emitting electrons, compared to the relatively short lifetime of keV synchrotron emitting electrons. The TeV photon spectral index of $\sim 2.4$ can also be related to the extended PWN X-ray synchrotron photon index of $\sim 2.3$, if this spectrum is dominated by synchrotron cooling. The anomalously large size of the pulsar wind nebula can be explained if the pulsar was born with a relatively large initial spindown power and braking index $n\sim 2$, provided that the SNR expanded into the hot ISM with relatively low density ($\sim 0.003$ cm$^{-3}$).
de Jager Ocker C.
for the HESS Collaboration
Funk Stefan
Hinton Jim
No associations
LandOfFree
HESS J1825-137: A pulsar wind nebula associated with PSR B1823-13? 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 HESS J1825-137: A pulsar wind nebula associated with PSR B1823-13?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HESS J1825-137: A pulsar wind nebula associated with PSR B1823-13? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-688138