Hunting Gamma-Ray-emitting FR0 Radio Galaxies in Wide-field Sky Surveys

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Meghana Pannikkote, Vaidehi S. Paliya, D. J. Saikia
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引用次数: 0

Abstract

Abstract The latest entry in the jetted active galactic nuclei (AGN) family is the Fanaroff–Riley type 0 (FR0) radio galaxies. They share several observational characteristics, e.g., nuclear emission and host galaxy morphology, with FR I sources; however, they lack extended, kiloparsec-scale radio structures, which are the defining features of canonical FR I and II sources. Here we report the identification of seven γ -ray-emitting AGN as FR0 radio sources by utilizing the high-quality observations delivered by ongoing multiwavelength wide-field sky surveys, e.g., Very Large Array Sky Survey. The broadband observational properties of these objects are found to be similar to their γ -ray undetected counterparts. In the γ -ray band, FR0 radio galaxies exhibit spectral features similar to more common FR I and II radio galaxies, indicating a common γ -ray production mechanism and the presence of misaligned jets. Although the parsec-scale radio structure of FR0s generally exhibits a wide range, with about half having emission on opposite sides of the core, the γ -ray-detected FR0s tend to have dominant cores with core-jet structures. We conclude that dedicated, high-resolution observations are needed to unravel the origin of relativistic jets in this enigmatic class of faint yet numerous population of compact radio sources.
在广域天空巡天中寻找发射伽马射线的FR0射电星系
喷射活动星系核(AGN)家族的最新成员是Fanaroff-Riley型0 (FR0)射电星系。它们具有几个观测特征,例如核发射和宿主星系形态,具有FR I源;然而,它们缺乏扩展的千秒尺度射电结构,这是典型FR I和II源的定义特征。在这里,我们报告了通过利用正在进行的多波长宽视场巡天(例如甚大阵巡天)提供的高质量观测结果,确定了7个γ射线发射AGN为FR0射电源。这些物体的宽带观测特性被发现与它们未被探测到的γ射线相似。在γ射线波段,FR0射电星系表现出与更常见的FR I和II射电星系相似的光谱特征,表明了共同的γ射线产生机制和失调喷流的存在。虽然FR0s的秒差尺度射电结构通常表现出很宽的范围,大约一半的FR0s在核心的两侧有发射,但γ射线探测到的FR0s往往具有核心-射流结构的主导核心。我们的结论是,需要专门的、高分辨率的观测来解开这类神秘的微弱而众多的紧凑型射电源中相对论性喷流的起源。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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