Quasi-periodic oscillation in Seyfert galaxies: Significance levels. The case of Markarian 766

被引：48

作者：

Benlloch, S

Wilms, J

Edelson, R

Yaqoob, T

Staubert, R

机构：

[1] Univ Tubingen, Inst Astron & Astrophys Astron, D-72076 Tubingen, Germany

[2] Univ Calif Los Angeles, Dept Astron, Los Angeles, CA 90095 USA

[3] NASA, High Energy Astrophys Lab, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 562卷 / 02期

基金：

美国国家航空航天局;

关键词：

accretion; accretion disks; galaxies : individual (Markarian 766) -; galaxies : Seyfert; X rays : galaxies;

D O I：

10.1086/338252

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss methods to compute significance levels for the existence of quasi-periodic oscillations (QPOs) in active galactic nuclei (AGNs) that take the red-noise character of the X-ray light curves of these objects into account. Applying epoch folding and periodogram analysis to the XMM-Newton observation of the Seyfert galaxy Mrk 766, a possible QPO at a timescale of 4200 s has been reported. Our computation of the significance of this QPO, however, shows that the 4200 s peak is not significant at the 95% level. We conclude that the 4200 s feature is an artifact of the red-noise process and not the result of a physical process within the AGNs.

引用

页码：L121 / L124

页数：4

共 30 条

[1]

Bevington P., 2002, Data Reduction and Error Analysis for the Physical Sciences, V3rd ed.

[2] Detection of an x-ray periodicity in the Narrow-line Seyfert 1 Galaxy Mrk 766 with XMM-Newton [J].