2010A&A...514A..69Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET12:32:00

2010A&A...514A..69Z - Astronomy and Astrophysics, volume 514, A69-69 (2010/5-1)

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

ZHANG S., COLLMAR W., TORRES D.F., WANG J.-M., LANG M. and ZHANG S.-N.

Abstract (from CDS):

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 emINTEGRAL observations of the blazar PKS 0208-512, which are supplemented by emSwift ToO observations. The high energy X-ray and γ-ray emission of PKS 0208-512 during August-December 2008 has been studied using 682ks of INTEGRAL guest observer time and ∼56ks of emSwift/XRT observations. These data were collected during the decay of a γ-ray flare observed by emFermi/LAT. At X-ray energies (0.2-10keV) PKS 0208-512 is significantly detected by emSwift/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 0.5-1MeV band when combining all emINTEGRAL/SPI data. Non-detections at energies below and above this band by emINTEGRAL/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.

Abstract Copyright:

Journal keyword(s): X-rays: individual: PKS 0208-512

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO B0208-512 BLL 02 10 46.2000629834 -51 01 01.893312084   17.10 16.93 14.82   ~ 387 1
2 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1862 2
3 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6301 3
4 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1938 2
5 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1579 1

    Equat.    Gal    SGal    Ecl

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2020.12.03-12:32:00

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