PKS2005-489 at VHE: four years of monitoring with HESS and simultaneous multi-wavelength observations
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(Published version)
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2010
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Nicholas, B.
Rowell, G.
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Astronomy and Astrophysics: a European journal, 2010; 511(1):A52-1-A52-13
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F. Acero, B. Nicholas, G. Rowell,...and et al, and H.E.S.S. Collaboration.
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Abstract
VHE 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.
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Copyright © 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.