Source Count Distribution of Fermi LAT Gamma-Ray Blazars Using Novel Nonparametric Methods

IF 2.5 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Universe Pub Date : 2024-08-26 DOI:10.3390/universe10090340
Xuhang Yin, Houdun Zeng
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引用次数: 0

Abstract

We utilized a sample from the Fermi-LAT 14-year Source Catalog by adjusting the flux detection threshold, enabling us to derive the intrinsic source count distribution dN/dF25 of extragalactic blazars using nonparametric, unbinned methods developed by Efron and Petrosian and Lynden-Bell. Subsequently, we evaluated the contribution of blazars to the extragalactic gamma-ray background. Our findings are summarized as follows: (1) There is no significant correlation between flux and spectral index values among blazars and their subclasses FSRQs and BL Lacs. (2) The intrinsic differential distributions of flux values exhibit a broken-power-law form, with parameters that closely match previous findings. The intrinsic photon index distributions are well described by a Gaussian form for FSRQs and BL Lacs individually, while a dual-Gaussian model provides a more appropriate fit for blazars as a whole. (3) Blazars contribute 34.5% to the extragalactic gamma-ray background and 16.8% to the extragalactic diffuse gamma-ray background. When examined separately, FSRQs and BL Lacs contribute 19.6% and 13% to the extragalactic gamma-ray background, respectively.
使用新型非参数方法研究费米 LAT 伽马射线耀斑星的源计数分布
我们通过调整通量探测阈值,利用费米-LAT 14 年源目录中的样本,采用 Efron 和 Petrosian 以及 Lynden-Bell 提出的非参数、无分隔方法,得出了银河系外炽星的内在源计数分布 dN/dF25。随后,我们评估了伽马射线星对银河系外伽马射线背景的贡献。我们的研究结果总结如下(1) 在亮星及其子类 FSRQs 和 BL Lacs 之间,通量和光谱指数值之间没有明显的相关性。(2)通量值的本征差异分布呈现出一种断裂幂律形式,其参数与之前的发现非常接近。FSRQs和BL Lacs各自的本征光子指数分布可以用高斯形式很好地描述,而双高斯模型则对整个类星体提供了更合适的拟合。(3) 亮星对银河系外伽马射线背景的贡献率为34.5%,对银河系外漫反射伽马射线背景的贡献率为16.8%。如果分开来看,FSRQs和BL Lacs分别占银河系外伽马射线背景的19.6%和13%。
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来源期刊
Universe
Universe Physics and Astronomy-General Physics and Astronomy
CiteScore
4.30
自引率
17.20%
发文量
562
审稿时长
24.38 days
期刊介绍: Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.
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