Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-01-01
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en
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15
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Monthly Notices of the Royal Astronomical Society, Volume 527, issue 3, pp. 5717-5731
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 E > 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 abo v e 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 impro v ed sensitivity, in extending the data availability in energy bands currently unco v ered.Description
Funding Information: SV, ID, CP, FC, AdR, LdG, SK, MNI, APP, EE, LP, GP, SP, SR, GV, FV, and VV contributed equally to this work. We thank the referee for the prompt reply and the valuable comments which improved the quality of the manuscript. The authors acknowledge financial contribution from the grant ASI I/028/12/0. SV acknowledges financial contribution from the agreement ASI–INAF no. 2017-14-H.0. The Sardinia Radio Telescope is funded by the Ministry of University and Research (MIUR), Italian Space Agency (ASI), and the Autonomous Region of Sardinia (RAS) and is operated as National Facility by the National Institute for Astrophysics (INAF). The Medicina radio telescope is funded by the Ministry of University and Research (MIUR) and is operated as National Facility by the National Institute for Astrophysics (INAF). This research has made use of data from the OVRO 40-m monitoring program (Richards et al. ), supported by private funding from the California Institute of Technology and the Max Planck Institute for Radio Astronomy, and by NASA grants NNX08AW31G, NNX11A043G, and NNX14AQ89G and NSF grants AST-0808050 and AST-1109911. SK acknowledges support from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme under grant agreement no. 771282. Part of this work is based on archival data, software or online services provided by the Space Science Data Center – ASI. Publisher Copyright: © 2023 The Author(s).
Keywords
acceleration of particles, g amma rays: g alaxies, quasars: individual: PKS 1830-211, quasars: supermassive black holes, radiation mechanisms: non-thermal, relativistic processes
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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, Chen, A W, Hovatta, T, Melis, A, Max-Moerbeck, W, Perrodin, D, Pilia, M, Pili, M, Readhead, A C S, Reeves, R, Ridolfi, A, Vitali, F, Bulgarelli, A, Cattaneo, P W, Lucarelli, F, Morselli, A & Trois, A 2024, ' Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare ', Monthly Notices of the Royal Astronomical Society, vol. 527, no. 3, pp. 5717-5731 . https://doi.org/10.1093/mnras/stad3505