The remarkable γ-ray activity in the gravitationally lensed blazar PKS 1830-211

I. Donnarumma, A. De Rosa, V. Vittorini, H.R. Miller, L.Č. Popović, S. Simić, M. Tavani, J. Eggen, J. Maune, E. Kuulkers, E. Striani, S. Vercellone, G. Pucella, F. Verrecchia, C. Pittori, P. Giommi, L. Pacciani, G. Barbiellini, A. Bulgarelli, P.W. CattaneoA.W. Chen, E. Costa, E. Del Monte, Y. Evangelista, M. Feroci, F. Fuschino, F. Gianotti, A. Giuliani, M. Giusti, F. Lazzarotto, F. Longo, F. Lucarelli, A. Pellizzoni, G. Piano, P. Soffitta, M. Trifoglio, A. Trois

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We report the extraordinary γ-ray activity (E > 100MeV) of the gravitationally lensed blazar PKS 1830-211 (z = 2.507) detected by AGILE between 2010 October and November. On October 14, the source experienced a factor of ∼12 flux increase with respect to its average value and remained brightest at this flux level (∼500 × 10-8photonscm-2s -1) for about four days. The one-month γ-ray light curve across the flare showed a mean flux F(E > 100MeV) = 200 × 10 -8photonscm-2s-1, which resulted in a factor of four enhancement with respect to the average value. Following the γ-ray flare, the source was observed in near-IR (NIR)-optical energy bands at the Cerro Tololo Inter-American Observatory and in X-Rays by Swift/X-Ray Telescope and INTEGRAL/IBIS. The main result of these multifrequency observations is that the large variability observed in γ-rays does not have a significant counterpart at lower frequencies: no variation greater than a factor of ∼1.5 appeared in the NIR and X-Ray energy bands. PKS 1830-211 is then a good "γ-ray only flaring" blazar showing substantial variability only above 10-100MeV. We discuss the theoretical implications of our findings. © 2011. The American Astronomical Society. All rights reserved.
Original languageEnglish
Article numberL30
Pages (from-to)-
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 1 Aug 2011
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Donnarumma, I., De Rosa, A., Vittorini, V., Miller, H. R., Popović, L. Č., Simić, S., ... Trois, A. (2011). The remarkable γ-ray activity in the gravitationally lensed blazar PKS 1830-211. Astrophysical Journal Letters, 736(2), -. [L30].