Active galactic nuclei horizons from the gamma-ray perspective

IF 11.7 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Andrew M. Taylor
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引用次数: 2

Abstract

Recent results in the field of high energy active galactic nuclei (AGN) astrophysics, benefiting from improvements to gamma-ray instruments and observational strategies, have revealed a surprising wealth of unexpected phenomena. These developments have been brought about both through observational efforts to discover new very high energy gamma-ray emitters, as well as from further in-depth observations of previously detected and well studied objects. I here focus specifically on the discovery of repeated temporal structures observed in AGN lightcurves, and new hard spectral components within the spectral energy distributions of other AGN systems. The challenges that these new features place on the modeling of the sources are highlighted, along with some reflections on what these results tell us about the underlying nature of the emission processes at play.

伽玛射线视角下的活动星系核视界
得益于伽玛射线仪器和观测策略的改进,高能活动星系核(AGN)天体物理学领域的最新成果揭示了大量意想不到的现象。这些进展是通过发现新的高能伽玛射线发射体的观测努力,以及对以前探测到的和经过充分研究的物体的进一步深入观测而实现的。我在这里特别关注在AGN光曲线中观察到的重复时间结构的发现,以及在其他AGN系统的光谱能量分布中新的硬光谱成分。本文强调了这些新特征给源建模带来的挑战,并对这些结果告诉我们的有关发挥作用的排放过程的潜在本质的一些思考。
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来源期刊
New Astronomy Reviews
New Astronomy Reviews 地学天文-天文与天体物理
CiteScore
18.60
自引率
1.70%
发文量
7
审稿时长
11.3 weeks
期刊介绍: New Astronomy Reviews publishes review articles in all fields of astronomy and astrophysics: theoretical, observational and instrumental. This international review journal is written for a broad audience of professional astronomers and astrophysicists. The journal covers solar physics, planetary systems, stellar, galactic and extra-galactic astronomy and astrophysics, as well as cosmology. New Astronomy Reviews is also open for proposals covering interdisciplinary and emerging topics such as astrobiology, astroparticle physics, and astrochemistry.
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