Distinguishing radiation mechanisms and particle populations in blazar jets through long-term multi-band monitoring with RINGO3 and Fermi
arxiv(2024)
摘要
We present the results of seven years of multicolour photometric monitoring
of a sample of 31 γ-ray bright blazars using the RINGO3 polarimeter on
the Liverpool Telescope from 2013–2020. We explore the relationships between
simultaneous observations of flux in three optical wavebands along with Fermi
γ-ray data in order to explore the radiation mechanisms and particle
populations in blazar jets. We find significant correlations between optical
and γ-ray flux with no detectable time lag, suggesting leptonic emission
processes in the jets of these sources. Furthermore, we find the spectral
behaviour against optical and γ-ray flux for many sources is best fit
logarithmically. This is suggestive of a transition between
bluer-/redder-when-brighter into stable-when-brighter behaviour during high
activity states; a behaviour that might be missed in poorly sampled data,
resulting in apparent linear relationships.
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