Stochastic approach to modeling the γ-ray variability of Fermi/LAT blazars

被引：0

作者：

Sobolewska, M. ^{[1
]}

Siemiginowska, A. ^{[2
]}

Kelly, B. ^{[3
]}

Nalewajko, K. ^{[4
]}

机构：

[1] Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[3] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[4] Stanford Univ, SLAC Natl Accelerator Lab, Kavli Inst Particle Astrophys & Cosmol, Menlo Pk, CA 94025 USA

来源：

EXTRAGALACTIC JETS FROM EVERY ANGLE | 2015年 / 10卷 / 313期

关键词：

black hole physics; BL Lacertae objects: general; galaxies: active; galaxies: jets; gamma rays: galaxies; EVOLUTION;

D O I：

10.1017/S1743921315001805

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We studied the gamma-ray variability of 13 blazars observed with the Fermi Large Area Telescope (LAT). These blazars were among the brightest ones monitored during the first 4 years of the Fermi sky survey. We modelled their gamma-ray light curves with the Ornstein-Uhlenbeck (OU) process or mixed OU process. The power spectral density (PSD) of the OU process is a zero-centered Lorentzian function, proportional to 1/f(alpha) with a changing at a characteristic time scale, tau(0), from 0 (tau >> tau(0)) to 2 (tau << tau(0)). The PSD of the mixed OU process has in addition an intermediate part with 0 < alpha < 2 between the long and short characteristic time scales. We show that the OU model provides a good description of the Fermi/LAT light curves of three blazars in our sample. For the first time we provide constraints on the characteristic gamma-ray time scale of variability in two BL Lac sources, 3C 66A and PKS 2155-304. We find that the mixed OU process describes the light curves of the remaining 10 blazars better than the OU process. We infer that their Fermi/LAT PSD resemble power-law functions and constrain their PSD slopes.

引用

页码：21 / 26

页数：6

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