Correlation-delay analysis and Spectral Evolution of AO 0235+164

Details Correlation-delay analysis and Spectral Evolution of AO 0235+164 Correlation-delay analysis and Spectral Evolution of AO 0235+164

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001acasn..42..287c&link_type=abstract

Acta Astronomica Sinica, Vol.42, no.3, p.287-301

Astronomy and Astrophysics

Astronomy

Bl Lac Objects (Ao 0235+164), Dcf Correlation, Spectral Evolution

Scientific paper

We introduce the method of discrete correlation function supposed by Edelson & Krolik, which is fit to the correlation analysis of unevenly time-distributed flux density data due to irregular astronomical observations between different wavebands. We tested the method with two opposite extreme situations of perfect correlation and perfect un-correlation. The test results show that the DCF method is feasible. With the method, we have done the correlation analyses of the object at four wavebands. The results show that the radiative variation between 5 GHz, 8 GHz, 14.5 GHz and optical B band are of clear correlativity with earlier and faster variation at higher frequency than that at lower frequency. This may imply that the emissions at these bands (from radio to optical band) originate from the same radiative process, or the emissions are correlated. In addition, we find that the spectral index at radio bands varies with time, showing the form of inverse spectrum. Various kinds of evidences indicate that the outbursts are associated with the forming of shocks in relativistic jets. The spectral analyses of multiple wave bands and the studies of spectral evolution may be the effective way to reveal the problem.

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