Discovery of Very-high-energy Gamma-ray Emissions from the Low Luminosity AGN NGC 4278 by LHAASO
Crab Nebula
Spectral index
DOI:
10.48550/arxiv.2405.07691
Publication Date:
2024-05-13
AUTHORS (288)
ABSTRACT
The first source catalog of Large High Altitude Air Shower Observatory reported the detection a very-high-energy gamma ray source, 1LHAASO J1219+2915. In this paper further detailed study spectral and temporal behavior point-like have been carried. best-fit position TeV ($\rm{RA}=185.05^{\circ}\pm0.04^{\circ}$, $\rm{Dec}=29.25^{\circ}\pm0.03^{\circ}$) is compatible with NGC 4278 within $\sim0.03$ degree. Variation analysis shows an indication variability at few months level in band, which consistent low frequency observations. Based on these observations, we report $\gamma$-ray emissions from low-luminosity AGN 4278. observations by LHAASO-WCDA during active period has significance 8.8\,$\sigma$ photon index $\varGamma=2.56\pm0.14$ flux $f_{1-10\,\rm{TeV}}=(7.0\pm1.1_{\rm{sta}}\pm0.35_{\rm{syst}})\times10^{-13}\,\rm{photons\,cm^{-2}\,s^{-1}}$, or approximately $5\%$ Crab Nebula. discovery VHE indicates that compact, weak radio jet can efficiently accelerate particles emit photons.
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