INTEGRAL and Swift/XRT observations of the source PKS 0208-512

S. Zhang, W. Collmar, D. F. Torres, J. M. Wang, M. Lang, S. N. Zhang

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1 Citation (Scopus)

Abstract

Aims. The active galaxy PKS 0208-512, detected at lower energies by COMPTEL, has been claimed to be a MeV blazar from EGRET. We report on the most recent INTEGRAL observations of the blazar PKS 0208-512, which are supplemented by Swift ToO observations. Methods. The high energy X-ray and γ-ray emission of PKS 0208-512 during August-December 2008 has been studied using 682 ks of INTEGRAL guest observer time and ~56 ks of Swift/XRT observations. These data were collected during the decay of a γ-ray flare observed by Fermi/LAT. Results. At X-ray energies (0.2-10 keV) PKS 0208-512 is significantly detected by Swift/XRT, showing a power-law spectrum with a photon index of ~1.64. Its X-ray luminosity varied by roughly 30% during one month. At hard X-/soft γ-ray energies PKS 0208-512 shows a marginally significant (~3.2σ) emission in the 0.5-1 MeV band when combining all INTEGRAL/SPI data. Non-detections at energies below and above this band by INTEGRAL/SPI may indicate intrinsic excess emission. If this possible excess is produced by the blazar, one possible explanation could be that its jet consists of an abundant electron-positron plasma, which may lead to the emission of an annihilation radiation feature. Assuming this scenario, we estimate physical parameters of the jet of PKS 0208-512. © 2010 ESO.
Original languageEnglish
Article numberA69
JournalAstronomy and Astrophysics
Volume514
Issue number10
DOIs
Publication statusPublished - 21 May 2010

Keywords

  • X-rays: individuals: PKS 0208-512

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