Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010raa....10..653z&link_type=abstract
Research in Astronomy and Astrophysics, Volume 10, Issue 7, pp. 653-662 (2010).
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
Historical optical data are combined on the BL Lac object OQ 530. Verifying the existence of correlations among the flux variations in different bands serves as an important tool to investigate emission processes. To examine the possible existence of a lag between variations in different optical bands from this source, a statistical analysis is performed through the discrete correlation function (DCF) method and the z-transformed discrete correlation function (ZDCF) method. Monte Carlo simulations called ``flux redistribution/random subset selection'' (FR/RSS) are performed to obtain statistically meaningful values for the cross-correlation time lags and their related uncertainties. The analysis confirms that the variations in different optical light curves are strongly correlated, with zero-lag within the errors. Long term variability of color indexes is also analyzed. The result suggests a strong correlation between color index and brightness. A clear bluer-when-brighter chromatism is found, in the sense that the spectrum steepens as the brightness decreases.
Cao Zhen
Dai Ben-Zhong
Zhang Bing-Kai
Zhang Lianchang
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