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Characterizing the $γ$-ray Emission from FR0 Radio Galaxies
arXiv - PHYS - Astrophysics of Galaxies Pub Date : 2023-10-30 , DOI: arxiv-2310.19888
Nikita S. KhatiyaClemson University, USA, Margot BoughelilbaUniversität Innsbruck, Austria, Christopher M. KarwinClemson University, USANASA GSFC, USA, Alex McDanielClemson University, USA, Xiurui ZhaoCenter for Astrophysics, Harvard-Smithsonian, USA, Marco AjelloClemson University, USA, Anita ReimerUniversität Innsbruck, Austria, Dieter H. HartmannClemson University, USA
arXiv - PHYS - Astrophysics of Galaxies Pub Date : 2023-10-30 , DOI: arxiv-2310.19888
Nikita S. KhatiyaClemson University, USA, Margot BoughelilbaUniversität Innsbruck, Austria, Christopher M. KarwinClemson University, USANASA GSFC, USA, Alex McDanielClemson University, USA, Xiurui ZhaoCenter for Astrophysics, Harvard-Smithsonian, USA, Marco AjelloClemson University, USA, Anita ReimerUniversität Innsbruck, Austria, Dieter H. HartmannClemson University, USA
FR0 galaxies constitute the most abundant jet population in the local
Universe. With their compact jet structure, they are broadband photon emitters
and have been proposed as multi-messenger sources. Recently, these sources have
been detected for the first time in $\gamma$ rays. Using a revised FR0 catalog,
we confirm that the FR0 population as a whole are $\gamma$-ray emitters, and we
also identify two significant sources. For the first time, we find a
correlation between the 5 GHz core radio luminosity and $\gamma$-ray luminosity
in the 1 - 800 GeV band, having a 4.5$\sigma$ statistical significance. This is
clear evidence that the jet emission mechanism is similar in nature for FR0s
and the well-studied canonical FR (FRI and FRII) radio galaxies. Furthermore,
we perform broadband SED modeling for the significantly detected sources as
well as the subthreshold source population using a one-zone SSC model. Within
the maximum jet power budget, our modeling shows that the detected gamma rays
from the jet can be explained as inverse Compton photons. To explain the
multi-wavelength observations for these galaxies, the modeling results
stipulate a low bulk Lorentz factor and a jet composition far from
equipartition, with the particle energy density dominating over the magnetic
field energy density.
中文翻译:
描述 FR0 射电星系 $γ$ 射线发射的特征
FR0 星系构成了当地宇宙中最丰富的喷流群。凭借其紧凑的射流结构,它们是宽带光子发射器,并已被提议作为多信使源。最近,首次在$\gamma$射线中检测到这些源。使用修订后的 FR0 目录,我们确认 FR0 群体作为一个整体是 $\gamma$ 射线发射体,并且我们还确定了两个重要的来源。我们首次发现 1 - 800 GeV 频段内 5 GHz 核心射电光度与 $\gamma$ 射线光度之间的相关性,具有 4.5$\sigma$ 统计显着性。这是明确的证据,表明 FR0 和经过充分研究的规范 FR(FRI 和 FRII)射电星系的喷流发射机制在本质上是相似的。此外,我们使用单区 SSC 模型对显着检测到的源以及阈下源群体进行宽带 SED 建模。在最大射流功率预算内,我们的模型表明,检测到的来自射流的伽马射线可以解释为逆康普顿光子。为了解释这些星系的多波长观测,建模结果规定了低体积洛伦兹因子和远离均分的射流成分,其中粒子能量密度支配着磁场能量密度。
更新日期:2023-11-03
中文翻译:
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描述 FR0 射电星系 $γ$ 射线发射的特征
FR0 星系构成了当地宇宙中最丰富的喷流群。凭借其紧凑的射流结构,它们是宽带光子发射器,并已被提议作为多信使源。最近,首次在$\gamma$射线中检测到这些源。使用修订后的 FR0 目录,我们确认 FR0 群体作为一个整体是 $\gamma$ 射线发射体,并且我们还确定了两个重要的来源。我们首次发现 1 - 800 GeV 频段内 5 GHz 核心射电光度与 $\gamma$ 射线光度之间的相关性,具有 4.5$\sigma$ 统计显着性。这是明确的证据,表明 FR0 和经过充分研究的规范 FR(FRI 和 FRII)射电星系的喷流发射机制在本质上是相似的。此外,我们使用单区 SSC 模型对显着检测到的源以及阈下源群体进行宽带 SED 建模。在最大射流功率预算内,我们的模型表明,检测到的来自射流的伽马射线可以解释为逆康普顿光子。为了解释这些星系的多波长观测,建模结果规定了低体积洛伦兹因子和远离均分的射流成分,其中粒子能量密度支配着磁场能量密度。