Optical quasi-periodic oscillation and color behavior of blazar PKS 2155-304

PKS 2155-304 is a well studied BL Lac object in the southern sky. The historical optical data during different periods have been collected and compiled. Light curves spanning 35 yr have been constructed. The R-band light curve has been ana- lyzed by means of three methods： the epoch folding method,...

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Published inResearch in astronomy and astrophysics Vol. 14; no. 8; pp. 933 - 941
Main Authors Zhang, Bing-Kai, Zhao, Xiao-Yun, Wang, Chun-Xiao, Dai, Ben-Zhong
Format Journal Article
LanguageEnglish
Published 01.08.2014
Subjects
Astronomy
Blazars
Blazar天体
Brightness
Color
Correlation
Jurkevich法
Light curve
PKS
Southern sky
Time
光变曲线
光学
准周期振荡
色彩
行为
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Summary:PKS 2155-304 is a well studied BL Lac object in the southern sky. The historical optical data during different periods have been collected and compiled. Light curves spanning 35 yr have been constructed. The R-band light curve has been ana- lyzed by means of three methods： the epoch folding method, the Jurkevich method and the discrete correlation function method. It is derived that there is an evident periodic component of 317 d （i.e. 0.87 yr） superposed on a long-term trend with large- amplitude variation in the light curve. The variability of this source is accompanied by a slight color variation, and the brightness and color index are correlated with each other. On a long-term time scale, PKS 2155-304 exhibits a tendency of bluer-when- brighter, which means the spectrum becomes flatter when the source brightens.
Bibliography:11-5721/P
PKS 2155-304 is a well studied BL Lac object in the southern sky. The historical optical data during different periods have been collected and compiled. Light curves spanning 35 yr have been constructed. The R-band light curve has been ana- lyzed by means of three methods： the epoch folding method, the Jurkevich method and the discrete correlation function method. It is derived that there is an evident periodic component of 317 d （i.e. 0.87 yr） superposed on a long-term trend with large- amplitude variation in the light curve. The variability of this source is accompanied by a slight color variation, and the brightness and color index are correlated with each other. On a long-term time scale, PKS 2155-304 exhibits a tendency of bluer-when- brighter, which means the spectrum becomes flatter when the source brightens.
BL Lacertae objects; general -- BL Lacertae objects; individual （PKS 2155-304） -- galaxies; active -- method; statistical
ObjectType-Article-1
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content type line 23
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/14/8/004