The broad-band X-ray spectrum of the blazar PKSB1830-211 by Chandra and INTEGRAL

In this paper we present a broad-band study of the X-ray emission of the blazar PKS 1830-211 based on Chandra and INTEGRAL observations. Notwithstanding the high redshift ( z = 2.507), it is a bright X-ray source (F(2 - 10 keV) similar or equal to 10(-11) erg cm(-2) s(-1)), due to gravitational lensing by an intervening galaxy at z = 0.89. Previous X-ray observations attribute the observed absorption at E < 2 keV to the lensing galaxy. Our analysis, although not in contrast with this hypothesis, suggests also the possibility of an intrinsic ( ionized) absorption, taking place at the front side of the jet. This scenario is also supported by some evidence, in the same data, of a feature observed at 2.15 keV which can be interpreted as a blueshifted iron line (v/ c similar or equal to 0.18). The SED of PKS 1830-211 can be well modelled by combining a Synchrotron Self-Compton component and an external source of photons to be scattered up to gamma-ray energies by relativistic electrons moving outward in the jet. The main source of low energy photons is a dust torus at the temperature of 103 K as expected in MeV blazars.