Search for Quasi-periodic Oscillations of Spectral Variability with Jurkevich Technique

We have analyzed the multi-wavelength observations taken from the database of Quasar 3C 273 hosted by ISDC (INTEGRAL Science Data Centre) with the Jurkevich technique, and presented the multi-wavelength spectral indices variability behaviors. The quasi-periodic oscillations of multi-wavelength spectral indices are in agreement with the flux variability period of about 2.5 years, 5.0 years and 8.0 years in the radio band. Furthermore, a tendency that spectral indices to become bluer as the brightness increase can be confirmed.