A SEARCH FOR FAST X-RAY VARIABILITY FROM ACTIVE GALACTIC NUCLEI USING SWIFT

被引：8

作者：

Pryal, Matthew ^{[1
]}

Falcone, Abe ^{[1
]}

Stroh, Michael ^{[1
]}

机构：

[1] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 802卷 / 01期

关键词：

acceleration of particles; galaxies: active; galaxies: jets; gamma rays: general; X-rays: general;

D O I：

10.1088/0004-637X/802/1/33

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Blazars are a class of active galactic nuclei (AGNs) known for their very rapid variabilty in the high energy regions of the electromagnetic spectrum. Despite this known fast variability, X-ray observations have generally not revealed variability in blazars with rate doubling or halving timescales less than approximately 15 minutes. Since its launch, the Swift X-ray Telescope has obtained 0.2-10 keV X-ray data on 143 AGNs, including blazars, through intense target of opportunity observations that can be analyzed in a multiwavelength context and used to model jet parameters, particularly during flare states. We have analyzed this broad Swift data set in a search for short timescale variability in blazars that could limit the size of the emission region in the blazar jet. While we do find several low-significance possible flares with potential indications of rapid variability, we find no strong evidence for rapid (<15 minutes) doubling or halving times in flares in the soft X-ray energy band for the AGNs analyzed.

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