PKS2005-489 at VHE: four years of monitoring with HESS and simultaneous multi-wavelength observations

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dc.contributor.authorNicholas, B.
dc.contributor.authorRowell, G.
dc.contributor.organisationH.E.S.S. Collaboration
dc.date.issued2010
dc.description.abstractVHE observations of PKS 2005-489 were made with HESS from 2004 through 2007, together with three simultaneous multi-wavelength campaigns performed with XMM-Newton and RXTE in 2004 and 2005. A strong VHE signal, ~17sigma total, is detected during the four years of HESS observations (90.3 hrs live time). The integral flux above the average analysis threshold of 400 GeV is ~3% of the Crab and varies weakly on time-scales from days to years. At X-ray energies the flux is observed to vary by more than an order of magnitude between 2004 and 2005. Strong changes in the X-ray spectrum (DeltaGamma~0.7) are also observed, which appear to be mirrored in the VHE band. The SED of PKS 2005-489, constructed for the first time with contemporaneous data on both humps, shows significant evolution. The large flux variations in the X-ray band, coupled with weak or no variations in the VHE band and a similar spectral behavior, suggest the emergence of a new, separate, harder emission component in September 2005.
dc.description.statementofresponsibilityF. Acero, B. Nicholas, G. Rowell,...and et al, and H.E.S.S. Collaboration.
dc.identifier.citationAstronomy and Astrophysics: a European journal, 2010; 511(1):A52-1-A52-13
dc.identifier.doi10.1051/0004-6361/200913073
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.orcidRowell, G. [0000-0002-9516-1581]
dc.identifier.urihttp://hdl.handle.net/2440/61207
dc.language.isoen
dc.publisherE D P Sciences
dc.rightsCopyright © ESO, 2010. All rights reserved. Submitted to Cornell University’s online archive www.arXiv.org in 2009 by Luigi Costamante.Post-print sourced from www.arxiv.org.
dc.source.urihttp://arxiv.org/abs/0911.2709
dc.subjectgalaxies: active
dc.subjectBL Lacertae objects: individual: PKS 2005-489
dc.subjectgamma rays: galaxies
dc.subjectX-rays: individuals: PKS 2005-489
dc.subjectCosmology and Extragalactic Astrophysics (astro-ph.CO)
dc.titlePKS2005-489 at VHE: four years of monitoring with HESS and simultaneous multi-wavelength observations
dc.typeJournal article
pubs.publication-statusPublished

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