Speaker
Description
The extragalactic gamma-ray sky observed by Fermi-LAT is dominated by blazars, with only a handful of narrow-line Seyfert 1 (NLS1) galaxies detected in 10 years of observation. Flares from this elusive source class are among the rarest events that the Fermi-LAT has seen so far, and we are presenting the analysis on one such event from the radio- and gamma-ray loud source PKS 2004–447.
On 2019 October 25, PKS 2004–447 showed its first bright γ-ray flare since the beginning of the Fermi mission in August 2008. We obtained multi-wavelength follow-up observations with Swift, XMM-Newton, NuSTAR, and ATCA, and studied the variability across all energy bands, with a focus on short timescales in the γ-ray emission. We modelled the broadband spectral energy distribution (SED) data with a leptonic model during different activity states of the source.
The observations of PKS 2004–447, and γ-NLSy1 in general, point to a scenario in which these objects could be considered to belong to the blazar subclass of radio-loud emitters.
| Track | AGN |
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