Statistical X-ray analysis of gamma-ray-emitting radio galaxies

IF 2.2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Hiroto Matake, Yasushi Fukazawa
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引用次数: 0

Abstract

Abstract We systematically analyzed Swift/XRT X-ray data of gamma-ray-emitting radio galaxies (RGs) to study the origin of X-ray radiation. We studied the short-duration variability of spectra by using Swift/XRT data for 20 RGs. We found that gamma-ray-emitting RGs with a higher gamma-ray-to-X-ray flux ratio show a strong harder-when-brighter behavior. In addition, gamma-ray-emitting RGs with soft gamma-ray spectral index tend to have a hard X-ray spectral index and vice versa. Based on these properties, we imply a trend that gamma-ray-emitting RGs could be roughly classified into three types of X-ray emission: jet-dominated type, disk/corona-dominated type, and intermediate type. This classification is quite consistent with the optical and radio classification of RGs. In addition, we also discuss this result in terms of the Eddington luminosity ratio. These interpretations should be confirmed using larger samples of RGs in the future.
伽玛射线发射射电星系的统计x射线分析
摘要系统分析了射电伽玛星系(RGs)的Swift/XRT x射线数据,研究了x射线辐射的起源。利用Swift/XRT数据研究了20个RGs的光谱短时变性。我们发现伽马射线发射的RGs具有较高的伽马射线与x射线通量比,表现出强烈的越亮越硬的行为。此外,具有软伽马射线能谱指数的伽马射线发射RGs往往具有硬x射线能谱指数,反之亦然。基于这些性质,我们认为伽马射线发射RGs可以大致分为三种类型:喷流主导型、盘/日冕主导型和中间型。这种分类与RGs的光学和射电分类相当一致。此外,我们还从Eddington光度比的角度讨论了这一结果。这些解释应该在未来使用更大的RGs样本来证实。
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来源期刊
Publications of the Astronomical Society of Japan
Publications of the Astronomical Society of Japan 地学天文-天文与天体物理
CiteScore
4.10
自引率
13.00%
发文量
98
审稿时长
4-8 weeks
期刊介绍: Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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