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- W4205912361 abstract "The active galactic nucleus 4C +28.07 is a flat spectrum radio quasar, one of the brightest at $gamma$-ray energies. We study its multi-wavelength emission by analysing $sim12.3$ years of textit{Fermi-LAT} data in the $gamma$-ray band and textit{Swift-XRT/UVOT} available data in X-ray and Optical-to-Ultraviolet bands. In the $gamma$-ray band, five flaring periods have been detected, during which the flux dramatically increases by several times (>5) compared with its average quiescent phase. Quasi-simultaneously with the flaring times, the X-ray and UVOT data detected by textit{Swift-XRT/UVOT} have also been analysed. In one of the brightest flare periods (Flare 5; observed on Oct 12, 2018) the $gamma$-ray flux reached $(6.7pm0.81)times 10^{-6}$ photon/cm^2/s ($sim31times$ higher than the mean flux over 12.3 years) with detection significance of $sigma=6.1$. The apparent $gamma$-ray luminosity of this flaring corresponds to $3.6times10^{49}$ erg/s (for a distance of 8.38 Gpc), one of the highest $gamma$-ray luminosities observed for blazars. Flare 5 has an estimated $sim2$ hours time block, which can be considered the average $gamma$-ray variability time. The variability time constrains the $gamma$-ray emitting region size to <9e14 cm, which is close to the black hole radius. The spectral energy distributions (SEDs) in the $gamma$-ray band for the $sim12.3$ years of data show an early cut-off at $sim14$ GeV; beyond $sim60$ GeV, however, the spectrum hardens and is detected up to $sim316$ GeV. Similar spectral behaviour is also noticeable for the SEDs of flares, which can be linked to the photon absorption by the emitting region's internal and external narrow-band radiation fields. Considering the significance of the obtained results from 4C,+28.07, we compared the parameters with 3C,279 and M87, to motivate further studies." @default.
- W4205912361 created "2022-01-25" @default.
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- W4205912361 date "2021-12-04" @default.
- W4205912361 modified "2023-10-13" @default.
- W4205912361 title "Multiwavelength observations of the Blazar 4C + 28.07" @default.
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- W4205912361 doi "https://doi.org/10.1093/mnras/stab3538" @default.
- W4205912361 hasPublicationYear "2021" @default.
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