- Tytuł:
- Fermi-LAT and Suzaku observations of the radio galaxy Centaurus B
- Autorzy:
-
Cheung, C. C.
Funk, S.
Kataoka, J.
Takahashi, T.
Svoboda, J.
Odaka, H.
Stawarz, Łukasz
Tanaka, Y. T.
Yuasa, T.
Katsuta, J.
O’Sullivan, S. P. - Opis:
- Centaurus B is a nearby radio galaxy positioned in the southern hemisphere close to the Galactic plane. Here we present a detailed analysis of about 43 months of accumulated Fermi-LAT data of the $\gamma$-ray counterpart of the source initially reported in the 2nd Fermi-LAT catalog, and of newly acquired Suzaku X-ray data. We confirm its detection at GeV photon energies and analyze the extension and variability of the $\gamma$-ray source in the LAT dataset, in which it appears as a steady $\gamma$-ray emitter. The X-ray core of Centaurus B is detected as a bright source of a continuum radiation. We do not detect, however, any diffuse X-ray emission from the known radio lobes, with the provided upper limit only marginally consistent with the previously claimed ASCA flux. Two scenarios that connect the X-ray and $\gamma$-ray properties are considered. In the first one, we assume that the diffuse non-thermal X-ray emission component is not significantly below the derived Suzaku upper limit. In this case, modeling the inverse-Compton emission shows that the observed $\gamma$-ray flux of the source may in principle be produced within the lobes. This association would imply that efficient in-situ acceleration of the radiating electrons is occurring and that the lobes are dominated by the pressure from the relativistic particles. In the second scenario, with the diffuse X-ray emission well below the Suzaku upper limits, the lobes in the system are instead dominated by the magnetic pressure. In this case, the observed $\gamma$-ray flux is not likely to be produced within the lobes, but instead within the nuclear parts of the jet. By means of synchrotron self-Compton modeling, we show that this possibility could be consistent with the broad-band data collected for the unresolved core of Centaurus B, including the newly derived Suzaku spectrum.
- Dostawca treści:
- Repozytorium Uniwersytetu Jagiellońskiego
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