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Astron. Astrophys. 355, 880-884 (2000)
Research Note
The variability analysis of PKS 2155-304
J.H. Fan 1,2 and
R.G. Lin 1
1 Center for Astrophysics, Guangzhou Normal University, Guangzhou 510400, P.R. China (jhfan@guangztc.edu.cn)
2 Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center (CAS-PKU.BAC), Beijing, P.R. China
Received 9 July 1998 / Accepted 10 September 1999
Abstract
In this paper, the post-1977 photometric observations of PKS
2155-304 are compiled and used to discuss the variation periodicity.
Largest amplitude variations (![[FORMULA]](img1.gif)
;
![[FORMULA]](img2.gif)
; ![[FORMULA]](img3.gif)
;
![[FORMULA]](img4.gif)
; ![[FORMULA]](img5.gif)
)
and color indices (![[FORMULA]](img6.gif)
;
![[FORMULA]](img7.gif)
; ![[FORMULA]](img8.gif)
;
![[FORMULA]](img9.gif)
) are found. The Jurkevich's method
and DCF (Discrete Correlation Function) method indicate possible
periods of 4.16-years and 7.0-years in the V light curve.
Key words: galaxies: BL Lacertae objects: individual: PKS 2155-304
Contents
- 1. Introduction
- 2. Variation
- 2.1. Light curves
- 2.2. Periodicity
- 3. Discussion
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: March 21, 2000
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