Fermi-LAT and Suzaku observations of the radio galaxy Centaurus B

Katsuta, J.; Tanaka, Y. T.; Stawarz, Ł.; O’Sullivan, S. P.; Cheung, C. C.; Kataoka, J.; Funk, S.; Yuasa, T.; Odaka, H.; Takahashi, T.; Svoboda, J.

doi:10.1051/0004-6361/201220270

Title: Fermi-LAT and Suzaku observations of the radio galaxy Centaurus B

Journal Article · Mon Jan 28 00:00:00 EST 2013 · Astronomy and Astrophysics

DOI:https://doi.org/10.1051/0004-6361/201220270· OSTI ID:1356602

Katsuta, J.; Tanaka, Y. T.; Stawarz, Ł.; O’Sullivan, S. P.; Cheung, C. C.; Kataoka, J.; Funk, S.; Yuasa, T.; Odaka, H.; Takahashi, T.; Svoboda, J.

Centaurus B is a nearby radio galaxy positioned in the southern hemisphere close to the Galactic plane. Here, in this work, we present a detailed analysis of about 43 months of accumulated Fermi-LAT data of the γ-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 γ-ray source in the LAT dataset, in which it appears as a steady γ-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 γ-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 γ-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 γ-ray flux is not likely to be produced within the lobes, but instead within the nuclear parts of the jet. In conclusion, 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.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi-LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356602

Journal Information:: Astronomy and Astrophysics, Vol. 550; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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