SIMBAD references

We report an analysis of X-ray and γ-ray observations of PKS 1830-211, based on long-term campaigns carried out by INTEGRAL and COMPTEL. The INTEGRAL data currently available provide a 33 σ significance detection in the 20-100 keV band, while the COMPTEL 6 yr data provide a 5.2 σ significance detection in the 1-3 MeV energy band. In hard X-rays, INTEGRAL and supplementary Swift observations show flux variability on timescales of months. In γ-rays, the source shows persistent emission over years. The hard X-ray spectrum is well represented by a power-law model, with Γ∼1.3 in the 20-250 keV band. This photon index is consistent with a previous report of Γ∼1.3 obtained at E>3.5 keV from XMM-Newton data fitted with a broken power law model. The joint XMM-Newton and INTEGRAL spectrum presented here is thus fitted with a broken power law model; the parameters are refined as compared with the previous fit. The results show that the photon index changes from ∼1.0 to ∼1.3 at a break energy of ∼4 keV. At MeV energies, the spectrum softens to Γ∼2.2. These results, together with an EGRET measurement at E≥100 MeV, constitute a broadband spectrum containing the peak of the power output at MeV energies, similar to most high-luminosity γ-ray blazars. The measured spectral characteristics are discussed in the framework of gravitational lensing effects.