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arXiv 2609.31457astro-ph.HE

4FHL:费米硬源第四代目录

4FHL: The Fourth Catalog of Hard Fermi-LAT Sources

LAT Collaboration

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中文总结 AI 辅助

基于16年费米-LAT数据,发布50 GeV以上673个源的4FHL目录,灵敏度提升约2倍,多数为河外源,提供最深全天巡天并连接空间与地面TeV观测。

中文摘要 AI 辅助

我们呈现了一份由费米伽马射线太空望远镜上的大面积望远镜(LAT)在16年观测中探测到的能量高于50 GeV的源目录。这是硬费米-LAT源第四代目录(4FHL),包含在50 GeV至2 TeV能量范围内探测到的673个天体。与之前相同能量下的LAT目录(即2FHL目录)相比,灵敏度和定位精度提高了约2倍。光子统计量的增加,使探测数量相对于2FHL几乎翻倍,从而能够进行更详细的种群研究,包括识别在50 GeV以上探测到的较暗源。大多数源(84.7%)与河外对应体相关联,主要是BL Lac天体,其中包括36个红移z>1的天体。银河系源占样本的10%,主要是脉冲星风云和超新星遗迹,而约5%的源仍未被关联或分类不确定。有20个源在之前的LAT目录中没有对应体。4FHL目录提供了迄今为止50 GeV以上最深入的全天巡天。通过关注这一高能波段,它为天基伽马射线观测与当前及未来地基观测站所探测的TeV波段之间提供了基本联系。它可作为指导未来观测的有用参考,包括为切伦科夫望远镜后续观测提供新的潜在目标。

英文摘要

We present a catalog of sources detected above 50 GeV by the Fermi Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope using 16 years of observations. This is the Fourth Catalog of Hard Fermi-LAT Sources (4FHL), containing 673 objects detected in the 50 GeV-2 TeV energy range. The sensitivity and localization are improved by factors of $\sim$2 relative to the previous LAT catalog at the same energies (i.e. the 2FHL catalog). The increased photon statistics, nearly doubling the number of detections relative to 2FHL, enables more detailed population studies, including the identification of fainter sources detected above 50 GeV. The majority of the sources (84.7\%) are associated with extragalactic counterparts, primarily BL Lacertae objects, including 36 objects at redshift $z>1$. Galactic sources account for 10\% of the sample, mainly pulsar wind nebulae and supernova remnants, while $\sim$5\% remain unassociated or of uncertain classification. Twenty sources are reported with no counterpart in previous LAT catalogs. The 4FHL catalog provides the deepest all-sky survey above 50 GeV to date. By focusing on this high-energy regime, it provides a fundamental link between space-based gamma-ray observations and the TeV range probed by current and future ground-based observatories. It serves as a useful reference for guiding future observations, including new potential targets for follow-up with Cherenkov telescopes.

发表机构

  • Université Paris-Saclay(巴黎萨克雷大学)
  • Université Paris Cité(巴黎西岱大学)
  • CEA(法国原子能暨替代能源委员会)
  • CNRS(法国国家科学研究中心)
  • FSLAC IRL 2009(中法天文卫星联合实验室)
  • IAC(加那利天体物理研究所)
  • Istituto Nazionale di Fisica Nucleare, Sezione di Perugia(意大利国家核物理研究院佩鲁吉亚分部)
  • Department of Physics and Astronomy, Clemson University(克莱姆森大学物理与天文系)
  • Dipartimento di Fisica, Università di Trieste(的里雅斯特大学物理系)
  • Istituto Nazionale di Fisica Nucleare, Sezione di Trieste(意大利国家核物理研究院的里雅斯特分部)
  • Università di Pisa, Dipartimento di Fisica E. Fermi(比萨大学E.费米物理系)
  • Istituto Nazionale di Fisica Nucleare, Sezione di Pisa(意大利国家核物理研究院比萨分部)
  • Istituto Nazionale di Fisica Nucleare, Sezione di Bari(意大利国家核物理研究院巴里分部)
  • Università degli studi di Trento(特伦托大学)
  • Instituto de Astrofísica de Canarias(加那利天体物理研究所)
  • Universidad de La Laguna(拉帕拉斯大学)

机构由 AI 辅助整理,请以论文原文为准。

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