2021NatAs...5..460T

Query : 2021NatAs...5..460T

2021NatAs...5..460T - Nature Astronomy, 5, 460-464 (2021)

Potential PeVatron supernova remnant G106.3+2.7 seen in the highest-energy gamma rays.

TIBET AS{gamma} COLLABORATION, AMENOMORI M., BAO Y.W., BI X.J., CHEN D., CHEN T.L., CHEN W.Y., CHEN X., CHEN Y., CIRENNIMA C., DANZENGLUOBU D., FANG J.H., FANG K., FENG C.F., FENG Z., FENG Z.Y., GAO Q., GOU Q.B., GUO Y.Q., GUO Y.Y., HE H.H., HE Z.T., HIBINO K., HOTTA N., HU H., HU H.B., HUANG J., JIA H.Y., JIANG L., JIN H.B., KASAHARA K., KATAYOSE Y., KATO C., KATO S., KAWATA K., KIHARA W., KO Y., KOZAI M., LABACIREN L., LI A.F., LI H.J., LI W.J., LIN Y.H., LIU B., LIU C., LIU J.S., LIU M.Y., LIU W., LOU Y.-Q., LU H., MENG X.R., MUNAKATA K., NAKADA H., NAKAMURA Y., NANJO H., NISHIZAWA M., OHNISHI M., OHURA T., OZAWA S., QIAN X.L., QU X.B., SAITO T., SAKATA M., SAKO T.K., SHAO J., SHIBATA M., SHIOMI A., SUGIMOTO H., TAKANO W., TAKITA M., TAN Y.H., TATEYAMA N., TORII S., TSUCHIYA H., UDO S., WANG H., WU H.R., XUE L., YAMAMOTO Y., YANG Z., YOKOE Y., YUAN A.F., ZHAI L.M., ZHANG H.M., ZHANG J.L., ZHANG X., ZHANG X.Y., ZHANG Y., ZHANG Y., ZHANG Y., ZHAO S.P. and ZHAXISANGZHU Z.

Abstract (from CDS):

Cosmic rays (protons and other atomic nuclei) are believed to gain energies of petaelectronvolts (PeV) and beyond at astrophysical particle accelerators called `PeVatrons' inside our Galaxy. Although a characteristic feature of a PeVatron is expected to be a hard gamma-ray energy spectrum that extends beyond 100 teraelectronvolts (TeV) without a cut-off, none of the currently known sources exhibit such a spectrum owing to the low maximum energy of accelerated cosmic rays or owing to insufficient detector sensitivity around 100 TeV. Here, we report the observation of gamma-ray emission from the supernova remnant G106.3+2.7 above 10 TeV. This work provides flux data points up to and above 100 TeV and indicates that the very-high-energy gamma-ray emission above 10 TeV is well correlated with a molecular cloud rather than with the pulsar PSR J2229+6114. Regarding the gamma-ray emission mechanism of G106.3+2.7, this morphological feature appears to favour a hadronic origin via the π0 decay caused by accelerated relativistic protons over a leptonic origin via the inverse Compton scattering by relativistic electrons. Furthermore, we point out that an X-ray flux upper limit on the synchrotron spectrum would provide important information to firmly establish the hadronic scenario as the mechanism of particle acceleration at the source.

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Journal keyword(s):

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
3 SNR G106.3+02.7 SNR 22 27.5 +60 50           ~ 99 1
4 MGRO J2228+61 gam 22 28 +61.0           ~ 7 0
5 PSR J2229+6114 Psr 22 29 05.262 +61 14 08.48           ~ 252 2

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