Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare




Vercellone S, Donnarumma,, Pittori C, Capitanio F, De Rosa A, Di Gesu L, Kiehlmann S, Iacolina MN, Pellizzoni PA, Egron E, Pacciani L, Piano G, Puccetti S, Righini S, Valente G, Verrecchia F, Vittorini V, Tavani M, Brocato E, Chen AW, Hovatta Talvikki, Melis A, Max-Moerbeck W, Perrodin D, Pilia M, Pili M, Readhead ACS, Reeves R, Ridolfi A, Vitali F, Bulgarelli A, Cattaneo PW, Lucarelli F, Morselli A, Trois A

PublisherOXFORD UNIV PRESS

OXFORD

2023

Monthly Notices of the Royal Astronomical Society

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

MON NOT R ASTRON SOC

527

3

5717

5731

15

0035-8711

1365-2966

DOIhttps://doi.org/10.1093/mnras/stad3505(external)

https://academic.oup.com/mnras/article/527/3/5717/7420511(external)

https://research.utu.fi/converis/portal/detail/Publication/386792317(external)



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 FE>100 MeV ≈2.3 ×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.


Last updated on 2024-26-11 at 22:14