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# Radio and mid-infrared properties of the blazar J1419$-$0838

Mar 2023

The radio quasar NVSS J141922$-$083830 (J1419$-$0838) was initiallyclassified as an uncategorised blazar-type object, following its detection inthe $\gamma$-ray band with the Fermi space telescope. Later, usingmulti-waveband observations and modeling, its was found to be a flat-spectrumradio quasar (FSRQ). However, its radio emission has never been discussed indepth in the literature. Here we present a detailed analysis on the radioproperties of J1419$-$0838 using archival interferometric imaging data at pcand kpc scales. We conclude that the flux density variations, the flat radiospectrum, the compact nature of the quasar structure at all scales, and therelativistic Doppler enhancement of the radio emission all support the previousclassification as an FSRQ. We also investigated the short- and long-termmid-infrared (MIR) light curve of the quasar based on observations by theWide-field Infrared Survey Explorer satellite, and found that there issignificant variability on time-scales of days as well as years. Comparison ofthe MIR light curve to the times of previously reported $\gamma$-ray andoptical flares shows no clear correlation between the events at differentwavebands.

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