Variable gamma-ray sky at 1 GeV

被引：2

作者：

Pshirkov, M. S. ^{[1
,2
,3
]}

Rubtsov, G. I. ^{[2
,4
]}

机构：

[1] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119991, Russia

[2] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[3] Russian Acad Sci, Lebedev Phys Inst, Pushchino Radio Astron Observ, Pushchino 142290, Moscow Region, Russia

[4] Novosibirsk State Univ, Novosibirsk 630090, Russia

来源：

JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS | 2013年 / 116卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

LARGE-AREA TELESCOPE; OPTICAL VARIABILITY; LIGHT CURVES; BLAZARS; CAMPAIGN;

D O I：

10.1134/S1063776112130146

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We search for the long-term variability of the gamma-ray sky in the energy range E > 1 GeV with 168 weeks of the gamma-ray telescope Fermi-LAT data. We perform a full sky blind search for regions with variable flux looking for deviations from uniformity. We bin the sky into 12288 pixels using the HEALPix package and use the Kolmogorov-Smirnov test to compare weekly photon counts in each pixel with the constant flux hypothesis. The weekly exposure of Fermi-LAT for each pixel is calculated with the Fermi-LAT tools. We consider flux variations in a pixel significant if the statistical probability of uniformity is less than 4 x 10(-6), which corresponds to 0.05 false detections in the whole set. We identified 117 variable sources, 27 of which have not been reported variable before. The sources with previously unidentified variability contain 25 active galactic nuclei (AGN) belonging to the blazar class (11 BL Lacs and 14 FSRQs), one AGN of an uncertain type, and one pulsar PSR J0633+1746 (Geminga).

引用

页码：59 / 70

页数：12

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