[PDF] Correlation analysis between several observables of OJ 287 radio jet-论文阅读讨论-ReadPaper

摘要

We collected the archival data of blazar OJ~287 from heterogeneous very longbaseline interferometry (VLBI) monitoring programs at 2.3 GHz, 8.6 GHz, 15 GHzand 43 GHz. The data reduction and observable extraction of those multi-bandmulti-epoch observations are batch-processed consistently with our automatedpipeline. We present the multivariate correlation analysis on the observablesat each band. We employ the cross-correlation function to search thecorrelations and the Monte Carlo (MC) technique to verify the certainty ofcorrelations. Several correlations are found. The foremost findings are thecorrelations between the core flux density and the jet position angles ondifferent scales, which validated the plausible predictions of the jet withprecession characteristics. Meanwhile, there is a variation in the offsetbetween the core EVPA and the inner-jet position angle over time at 15~GHz and43~GHz.

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