Long term periodicity analysis of the spectral index of 2251+158

Details Long term periodicity analysis of the spectral index of 2251+158 Long term periodicity analysis of the spectral index of 2251+158

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011raa....11..286y&link_type=abstract

Research in Astronomy and Astrophysics, Volume 11, Issue 3, pp. 286-292 (2011).

Astronomy and Astrophysics

Astrophysics

Scientific paper

We analyze the radio spectral index of blazars from the University of Michigan Radio Astronomy Observatory database, and find that there exists quasi-periodic activity in 2251+158. The long-term periodicity analysis is accomplished by three methods, which are the Jurkevich method (Jurkevich), the discrete correlation function (DCF), and the Periodogram method (P). The results show that 2251+158 has two strong periodicities, which are P1 = 6.3 ± 1.1 yr and P2 = 3.8 ± 1.2 yr.

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