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キーワード:
Hochenergieastronomie
要旨:
The High Energy Stereoscopic system (H.E.S.S.) is an array of five
imaging atmospheric Cerenkov telescopes which aims at exploring the
high energy non-thermal processes in the universe via detecting veryhigh-
energy (VHE) gamma-rays. In this work, an advanced direction reconstruction
algorithm which yields better point spread function (PSF)
and sensitivity is developed to cope with the complex morphology
analysis in the Large Magellanic Cloud (LMC) region. LMC is a
satellite galaxy of Milky Way at the distance of 48 kpc. The relatively
short distance makes it a good extra-galactic laboratory for
astronomical observation. The H.E.S.S. observation focuses on the
three targets hosted in this region: the young supernova remnant SN
1987a, the pulsar wind nebula N 157B, and the superbubble 30Dor
C. The VHE flux of SN 1987a is predicted at the detectable level for
H.E.S.S. but no significant detection is found in the current dataset.
An upper limit on the gamma-ray flux is derived for this target. The pulsar
wind nebular N 157B is detected, and the spectrum and other
physical quantities are derived. The gamma-ray flux shows that it is the
most-energetic-ever observed pulsar wind nebula. At the vicinity of
N 157B, we find extra !-ray excess towards the direction of 30Dor
C. The existance of this source is established by detailed morphology
studies and its connection to 30Dor C is discussed.
