Discovery of TeV gamma-rays from SN1006: Further evidence for the SNR origin of cosmic rays - INSPIRE

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Discovery of TeV gamma-rays from SN1006: Further evidence for the SNR origin of cosmic rays

T. Tanimori
(
- Tokyo Inst. Tech.
)
,
Y. Hayami
(
- Tokyo Inst. Tech.
)
,
S. Kamei
(
- Tokyo Inst. Tech.
)
,
S.A. Dazeley
(
- Adelaide U.
)
,
P.G. Edwards
(
- JAXA, Sagamihara and
- Adelaide U.
)

Jan, 1998

17 pages

Published in:

Astrophys.J.Lett. 497 (1998) L25

e-Print:

astro-ph/9801275 [astro-ph]

DOI:

10.1086/311267

Report number:

ICRR-REPORT-409-98-5

View in:

ADS Abstract Service

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Abstract: (arXiv)

This paper reports the first discovery of TeV gamma-ray emission from a supernova remnant made with the CANGAROO 3.8 m Telescope. TeV gamma rays were detected at the sky position and extension coincident with the north-east (NE) rim of shell-type Supernova remnant (SNR) SN1006 (Type Ia). SN1006 has been a most likely candidate for an extended TeV Gamma-ray source, since the clear synchrotron X-ray emission from the rims was recently observed by ASCA (Koyama et al. 1995), which is a strong evidence of the existence of very high energy electrons up to hundreds of TeV in the SNR. The observed TeV gamma-ray flux was

(2.4\pm 0.5(statistical) \pm 0.7(systematic)) \times 10^{-12}

cm

^{-2}

s

^{-1}

(

\ge 3.0\pm 0.9

TeV) and

(4.6\pm 0.6 \pm 1.4) \times 10^{-12}

cm

^{-2}

s

^{-1}

(

\ge 1.7\pm 0.5

TeV) from the 1996 and 1997 observations, respectively. Also we set an upper limit on the TeV gamma-ray emission from the SW rim, estimated to be

1.1 \times 10^{-12}

cm

^{-2}

s

^{-1}

(

\ge 1.7\pm 0.5

TeV, 95% CL) in the 1997 data. The TeV gamma rays can be attributed to the 2.7 K cosmic background photons up-scattered by electrons of energies up to about 10

^{14}

eV by the inverse Compton (IC) process. The observed flux of the TeV gamma rays, together with that of the non-thermal X-rays, gives firm constraints on the acceleration process in the SNR shell; a magnetic field of

6.5\pm2

\mu

G is inferred from both the synchrotron X-rays and inverse Compton TeV gamma-rays, which gives entirely consistent mechanisms that electrons of energies up to 10

^{14}

eV are produced via the shock acceleration in SN1006.

photon: cosmic radiation
cosmic radiation: particle source
cosmic radiation: flux
astrophysics: supernova
cosmic background radiation
acceleration: shock waves
Cherenkov counter: imaging
experimental results

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Figures(0)

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