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High‐Energy Properties of PKS 1830−211
- Source :
- The Astrophysical Journal. 683:400-408
- Publication Year :
- 2008
- Publisher :
- American Astronomical Society, 2008.
-
Abstract
- We report on an analysis of X- and $\gamma$-ray observations of PKS 1830-211, based on the long-term campaigns carried out by \emph{INTEGRAL} and COMPTEL. The \emph{INTEGRAL} data currently available present a $33\sigma$ significance detection in the 20-100 keV band, while the COMPTEL 6-years data provide a $5.2\sigma$ significance detection in the 1-3 MeV energy band. At hard X-rays, \emph{INTEGRAL} and supplementary \emph{SWIFT} observations show flux variability on timescales of months. At $\gamma$-rays, the source shows persistent emission over years. The hard X-ray spectrum is well represented by a power-law model, with $\Gamma \sim 1.3$ in the 20-250 keV band. This photon index is well consistent with the previous report of $\Gamma \sim 1.3$ obtained at $E > 3.5$ keV from the best fit of \emph{XMM-Newton} data with a broken power law model. The joint \emph{XMM-Newton}/\emph{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 $\sim 1.0$ to $\sim 1.3$ at a break energy $\sim 4$ keV. At MeV energies, the spectrum softens to $\Gamma \sim 2.2$. These results, together with the EGRET measurement at $E \ge 100$ MeV, constitute a broad-band spectrum containing the peak of the power output at MeV energies, similar to most high-luminosity $\gamma$-ray blazars. The measured spectral characterstics are then discussed in the framework of the gravitational lens effects.<br />Comment: accepted for ApJ
- Subjects :
- Physics
Photon
Astrophysics::High Energy Astrophysical Phenomena
Astrophysics (astro-ph)
Spectrum (functional analysis)
FOS: Physical sciences
Flux
Astronomy and Astrophysics
Astrophysics
Power law
Gravitational lens
Space and Planetary Science
Electronic band structure
Blazar
Energy (signal processing)
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 683
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....8bc569ab54fcb996bd563776a384a16f