Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/61207
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Type: | Journal article |
Title: | PKS2005-489 at VHE: four years of monitoring with HESS and simultaneous multi-wavelength observations |
Author: | Nicholas, B. Rowell, G. |
Citation: | Astronomy and Astrophysics: a European journal, 2010; 511(1):A52-1-A52-13 |
Publisher: | E D P Sciences |
Issue Date: | 2010 |
ISSN: | 0004-6361 1432-0746 |
Organisation: | H.E.S.S. Collaboration |
Statement of Responsibility: | F. Acero, B. Nicholas, G. Rowell,...and et al, and H.E.S.S. Collaboration. |
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. |
Keywords: | galaxies: active BL Lacertae objects: individual: PKS 2005-489 gamma rays: galaxies X-rays: individuals: PKS 2005-489 Cosmology and Extragalactic Astrophysics (astro-ph.CO) |
Rights: | 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. |
DOI: | 10.1051/0004-6361/200913073 |
Published version: | http://arxiv.org/abs/0911.2709 |
Appears in Collections: | Aurora harvest 5 Chemistry and Physics publications IPAS publications |
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hdl_61207.pdf | Published version | 548.02 kB | Adobe PDF | View/Open |
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