arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0705.2946astro-ph
收藏

用H.E.S.S.探测遥远blazar 1 ES 1101-232的VHE gamma-ray发射和宽带表征

Detection of VHE gamma-ray emission from the distant blazar 1ES 1101-232 with H.E.S.S. and broadband characterisation

H. E. S. S. Collaboration, :, F. Aharonian

摘要:

blazar 1 ES 1101-232是利用高能立体观测系统(H.E.S.S.)在2004年和2005年,大气切伦科夫望远镜(ACT)的寿命为43小时。VHE(E > 10^11 eV)伽马射线是第一次从这个物体中探测到的。通过对耀变体的VHE观测,可以研究耀变体喷流的内部结构,同时也可以研究近红外波段的河外背景光。2005年的观测是在多波长活动中进行的,同时还使用了RXTE卫星和光学观测。2004年,获得了与XMM-牛顿的同步观测。使用H.E.S.S.检测到1 ES 1101-232。具有超过649个光子,其显著性为10 σ。测得的VHE伽马射线通量为dN/dE =(5.63 +- 0.89)x 10^-13(E/TeV)^-(2.94 +- 0.20)cm^-2 s^-1 TeV^-1,高于225 GeV的谱能量阈值。1 ES 1101-232具有非常硬的光谱,红移z=0.186,是迄今为止在VHE γ射线中发现的红移最高的耀变体。这些数据允许建设真正的同步光谱能量分布的来源,从光学的VHE波段。使用Aharonian等人(Nature,2006,440,1018)提出的在1.5 μm处νF_v = 14 nW m^-2 sr^-1的EBL模型,可以发现该源的本征VHE功率输出峰值在3 TeV以上。

英文摘要:

The blazar 1ES 1101-232 was observed with the High Energy Stereoscopic System (H.E.S.S.) of Atmospheric Cherenkov Telescopes (ACT) in 2004 and 2005, for a live time of 43 hours. VHE (E > 10^11 eV) gamma-rays were detected for the first time from this object. VHE observations of blazars are used to investigate the inner parts of the blazar jets, and also to study the extragalactic background light (EBL) in the near-infrared band. Observations in 2005 were conducted in a multiwavelength campaign, together with the RXTE satellite and optical observations. In 2004, simultaneous observations with XMM-Newton were obtained. 1ES 1101-232 was detected with H.E.S.S. with an excess of 649 photons, at a significance of 10 sigma. The measured VHE gamma-ray flux amounts to dN/dE = (5.63 +- 0.89) x 10^-13 (E/TeV)^-(2.94 +- 0.20) cm^-2 s^-1 TeV^-1, above a spectral energy threshold of 225 GeV. No significant variation of the VHE gamma-ray flux on any time scale was found. 1ES 1101-232 exhibits a very hard spectrum, and at a redshift of z=0.186, is the blazar with the highest confirmed redshift detected in VHE gamma-rays so far. The data allow the construction of truly simultaneous spectral energy distributions of the source, from the optical to the VHE band. Using an EBL model with νF_ν= 14 nW m^-2 sr^-1 at 1.5 μm as presented in Aharonian et al. (Nature, 2006, 440, 1018) suggests an intrinsic VHE power output peak of the source at above 3 TeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑