Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state

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dc.contributor.author Venter, Christo
dc.contributor.author Vorster, Michael Johannes
dc.contributor.author Büsching, Ingo
dc.contributor.author De Jager, Ocker Cornelis
dc.date.accessioned 2012-09-05T08:16:06Z
dc.date.available 2012-09-05T08:16:06Z
dc.date.issued 2011
dc.identifier.citation Büsching, I. et al. 2011. Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state. Astronomy & astrophysics, 533(A110):1-9. [http://www.aanda.org] en_US
dc.identifier.issn 0004-6361
dc.identifier.issn 1432-0746 (Online)
dc.identifier.uri http://hdl.handle.net/10394/7230
dc.description.abstract TeV γ-ray (H.E.S.S.), GeV γ-ray (Fermi/LAT), X-ray (RXTE, Swift), UV (Swift) and optical (ATOM, Swift) bands. This campaign was carried out during a high flux state in the synchrotron regime. The flux in the optical and X-ray bands reached the level of the historical maxima. The hard GeV spectrum observed with Fermi/LAT connects well to the very high energy (VHE, E > 100 GeV) spectrum measured with H.E.S.S. with a peak energy between ∼5 and 500 GeV. Compared to observations with contemporaneous coverage in the VHE and X-ray bands in 2004, the X-ray flux was ∼50 times higher during the 2009 campaign while the TeV γ-ray flux shows marginal variation over the years. The spectral energy distribution during this multi-wavelength campaign was fit by a one zone synchrotron self-Compton model with a well determined cutoff in X-rays. The parameters of a one zone SSC model are inconsistent with variability time scales. The variability behaviour over years with the large changes in synchrotron emission and small changes in the inverse Compton emission does not warrant an interpretation within a one-zone SSC model despite an apparently satisfying fit to the broadband data in 2009. en_US
dc.description.uri http://dx.doi.org/10.1051/0004-6361/201016170
dc.description.uri http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/abs/2011/09/aa16170-10/aa16170-10.html
dc.language.iso en en_US
dc.publisher EDP Science en_US
dc.subject Galaxies: active en_US
dc.subject BL Lacertae objects: individual: PKS 2005-489 en_US
dc.title Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state en_US
dc.type Article en_US

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