arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.2522astro-ph
收藏

Blazar星能谱的最新EBL限制

Constraints to Energy Spectra of Blazars based on Recent EBL Limits from Galaxy Counts

F. Krennrich, E. Dwek, A. Imran

摘要:

我们结合最近估计的星系对3.6微米强度的河外背景光(EBL)的贡献与光学和近红外(IR)星系计数,对一些最遥远的TeV耀变体1 ES 0229+200,1 ES 1218+30.4和1 ES 1101-232的本征光谱设置新的限制,位于红移0.1396,0.182和0.186。3.6微米EBL强度的新下限明显高于先前由已分辨斯皮策星系的累积发射所设定的下限。通过修正EBL的衰减校正,我们发现这三个耀变体的本征光谱的微分光谱指数为1.28 +-0.20或更硬。这些结果提出了耀变体发射模型的挑战,产生非常硬的本征光谱在子TeV到多TeV制度。这些结果也质疑最近得出的上限的近红外线EBL强度的可靠性,仅仅是基于假设,本征耀变体光谱不应硬于1.5。

英文摘要:

We combine the recent estimate of the contribution of galaxies to the 3.6 micron intensity of the extragalactic background light (EBL) with optical and near-infrared (IR) galaxy counts to set new limits on intrinsic spectra of some of the most distant TeV blazars 1ES 0229+200, 1ES 1218+30.4, and 1ES 1101-232, located at redshifts 0.1396, 0.182, and 0.186, respectively. The new lower limit on the 3.6 micron EBL intensity is significantly higher than the previous one set by the cumulative emission from resolved Spitzer galaxies. Correcting for attenuation by the revised EBL, we show that the differential spectral index of the intrinsic spectrum of the three blazars is 1.28 +- 0.20 or harder. These results present blazar emission models with the challenge of producing extremely hard intrinsic spectra in the sub-TeV to multi-TeV regime. These results also question the reliability of recently derived upper limits on the near-IR EBL intensity that are solely based on the assumption that intrinsic blazar spectra should not be harder than 1.5.

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。

↑