We report on an analysis of X- and γ-ray observations of PKS 1830 - 211, based on the long-term campaigns carried out by INTEGRAL and COMPTEL. The INTEGRAL data currently available present a 33σ significance detection in the 20 100 keV band, while the COMPTEL 6-years data provide a 5.2σ significance detection in the I - 3 MeV energy band. At hard X-rays, INTEGRAL and supplementary SWIFT observations show flux variability on timescales of months. At γ-rays, the source shows persistent emission over years. The joint XMMNewton/INTEGRAL spectrum presented here is then fit with a broken power-law model and the parameters are refined compared to the previous. The results show the photon index changes from ～ 1.0 to ~ 1.3 at a break energy ~ 4 keV. At MeV energies, the spectrum softens to Γ ~ 2.2. These results, together with the EGRET measurement at E ≥ 100 MeV, constitute a broad-band spectrum containing the peak of the power output at MeV energies, similar to most high-luminosity γ-ray blazars.
Quasars general - Quasars individual PKS 1830 - 211 - X-rays gal axies - Gamma-rays galaxies
S. Zhang Y.P. Chen W. Collmar L.F. Foschini T.P. Li D.F. Torres J.M. Wang
Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, 19B YuQuan Road, Beijing Max-Planck-Institut für Extraterrestrische Physik, P. O. Box 1603, 85740 Garching, Germany INAF/IASF-Bologna, via Gobetti 101, 40129, Bolognn, Italy Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, 19B YuQuan Road, Beijing IEEC-CSIC, Campus UAB,Facultat de Ciencies, Torre C5-parell, 2a planta, 08193 Barrelona, Spain Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, 19B YuQuan Road, Beijing