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arXiv 0908.0142astro-ph.HEastro-ph.CO
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1ES 1218+304的VERITAS Gamma-Ray发射的可变性的发现

VERITAS Discovery of Variability in the VHE Gamma-Ray Emission of 1ES 1218+304

Asif Imran

摘要:

1ES 1218+304是一组TeV耀变体之一,它们的红移显示出令人惊讶的硬能谱。VERITAS合作在2009年初对1ES 1218+304进行了密集的观测活动,以更详细地描述这些硬光谱遥远耀变体之一的发射特性。虽然硬光谱TeV耀变体是最有希望的揭开推定的签名EBL吸收,他们也可能有影响的冲击加速的情况下,在相对论射流。我们对1ES 1218+304的观测表明了显著的通量变化。此外,我们提出了一个扩展到多TeV制度的能谱。这些数据的影响$γ$射线发射模型进行了讨论。

英文摘要:

1ES 1218+304 is among a group of several TeV blazars that exhibit surprisingly hard energy spectra given their redshifts. The VERITAS collaboration has carried out an intensive observing campaign of 1ES 1218+304 in early 2009 to characterize the emission properties of one of these hard-spectra distant blazars in more detail. While hard-spectra TeV blazars are most promising for unveiling putative signatures from EBL absorption, they may also have implications on shock acceleration scenarios in relativistic jets. Our observations of 1ES 1218+304 demonstrate significant flux variability. Furthermore, we present an energy spectrum extending into the multi-TeV regime. The implications of these data for $γ$-ray emission models are discussed.

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