1. Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare.
- Author
-
Vercellone, S, Donnarumma, I, Pittori, C, Capitanio, F, De Rosa, A, Di Gesu, L, Kiehlmann, S, Iacolina, M N, Pellizzoni, P A, Egron, E, Pacciani, L, Piano, G, Puccetti, S, Righini, S, Valente, G, Verrecchia, F, Vittorini, V, Tavani, M, Brocato, E, and Chen, A W
- Subjects
SPECTRAL energy distribution ,BL Lacertae objects ,RADIO telescopes ,QUASARS ,IMAGE converters ,ENERGY bands ,SUPERMASSIVE black holes ,GAMMA ray bursts - Abstract
PKS 1830 -211 is a γ-ray emitting, high-redshift (z =2.507 ± 0.002), lensed flat-spectrum radio quasar. During the period 2019 mid-February to mid-April, this source underwent a series of strong γ-ray flares that were detected by both AGILE-GRID (Gamma-Ray Imaging Detector) and Fermi Large Area Telescope (Fermi -LAT), reaching a maximum γ-ray flux of |$F_{\rm E\gt 100\, MeV}\approx 2.3\times 10^{-5}$| photons cm
−2 s−1 . Here, we report on a coordinated campaign from both on-ground [Medicina, Owens Valley Radio Observatory (OVRO), Rapid Eye Mount (REM), and Sardinia Radio Telescope (SRT)] and orbiting facilities (AGILE, Fermi, INTEGRAL, NuSTAR, Swift , and Chandra), with the aim of investigating the multiwavelength properties of PKS 1830-211 through nearly simultaneous observations presented here for the first time. We find a possible break in the radio spectra in different epochs above 15 GHz, and a clear maximum of the 15 GHz data approximately 110 d after the γ-ray main activity periods. The spectral energy distribution shows a very pronounced Compton dominance (> 200) which challenges the canonical one-component emission model. Therefore, we propose that the cooled electrons of the first component are re-accelerated to a second component by, for example, kink or tearing instability during the γ-ray flaring periods. We also note that PKS 1830-211 could be a promising candidate for future observations with both Compton satellites [e.g. enhanced ASTROGAM (e-ASTROGAM)] and Cherenkov arrays [Cherenkov Telescope Array Observatory (CTAO)] which will help, thanks to their improved sensitivity, in extending the data availability in energy bands currently uncovered. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF