Abstract
This work is devoted to multi-frequency studying of the blazar 3C 454.3. The study includes spectroscopic and photometric observations in the optical, IR, and gamma-ray bands. We investigate whether a correlation exists in the light curves at different wavelengths. We have carried out observations of the optical spectrum (from 4000 to 7000 Angstroms) between 2007 and 2009, and identified MgII [2800 Angstroms] and FeII emission line features. We have obtained optical magnitudes and color indices of the quasar and performed a correlation between the optical, IR, and gamma-ray light curves. We have found statistically significant correlations between the light curves at different wavelengths.
Highlights
3C 454.3 is a blazar classified as a high polarized quasar (HPQ) with a redshift of z = 0.859. This is one of the brightest blazars, and it has a strong variability at all frequencies observed across the spectral energy distribution (SED)
Gu et al [2] concluded that the quasar contains a binary system of black holes with masses of 0.5–4 × 109 M, and an Eddington luminosity that ranges from 6 × 1046 to 5 × 1047 erg/s [3]
The observations used the LFOSC spectrograph, but calibration problems were detected from this spectrograph, so this data was eliminated
Summary
This is one of the brightest blazars, and it has a strong variability at all frequencies observed across the spectral energy distribution (SED). It exhibits superluminal motion of its radio jet components. The AGILE space telescope found that at energies greater than 100 MeV, 3C 454.3 has a variable flux. Due to the high variability, this is known as “Crazy Diamond”. A high activity was detected in 2007 by AGILE in gamma rays [1]. Variability of the gamma-ray continuum has been observed by the Fermi Gamma-ray Space Telescope since its launch
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