Sökning: (WFRF:(Almeida J)) pers:(Petrucci P. O) > (2010) > PKS2005-489 at VHE :
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000 | 09311naa a2202425 4500 | |
001 | oai:DiVA.org:lnu-30254 | |
003 | SwePub | |
008 | 131108s2010 | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-302542 URI |
024 | 7 | a https://doi.org/10.1051/0004-6361/2009130732 DOI |
040 | a (SwePub)lnu | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Acero, F.4 aut |
245 | 1 0 | a PKS2005-489 at VHE :b four years of monitoring with HESS and simultaneous multi-wavelength observations |
264 | c 2010-03-30 | |
264 | 1 | b EDP Sciences,c 2010 |
338 | a print2 rdacarrier | |
520 | a Aims. Our aim is to study the very high energy (VHE; E > 100 GeV) gamma-ray emission from BL Lac objects and the evolution in time of their broad-band spectral energy distribution (SED). Methods. VHE observations of the high-frequency peaked BL Lac object PKS 2005-489 were made with the High Energy Stereoscopic System (HESS) from 2004 through 2007. Three simultaneous multi-wavelength campaigns at lower energies were performed during the HESS data taking, consisting of several individual pointings with the XMM-Newton and RXTE satellites. Results. A strong VHE signal, similar to 17 sigma total, from PKS 2005-489 was detected during the four years of HESS observations (90.3 h live time). The integral flux above the average analysis threshold of 400 GeV is similar to 3% of the flux observed from the Crab Nebula and varies weakly on time scales from days to years. The average VHE spectrum measured from similar to 300 GeV to similar to 5 TeV is characterized by a power law with a photon index, Gamma = 3.20 +/- 0.16(stat) +/- 0.10(syst). 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 (Delta Gamma(X) approximate to 0.7) are also observed, which appear to be mirrored in the VHE band. Conclusions. 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. | |
650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
653 | a galaxies: active | |
653 | a BL Lacertae objects: individual: PKS 2005-489 | |
653 | a gamma rays: galaxies | |
653 | a X-rays: individuals: PKS 2005-489 | |
653 | a Astropartikelfysik | |
653 | a Astroparticle Physics | |
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700 | 1 | a Punch, M.u Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France4 aut0 (Swepub:lnu)mipuaa |
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710 | 2 | a Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France4 org |
773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 511, s. A52-q 511<A52-x 0004-6361x 1432-0746 |
856 | 4 | u https://www.aanda.org/articles/aa/pdf/2010/03/aa13073-09.pdf |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-30254 |
856 | 4 8 | u https://doi.org/10.1051/0004-6361/200913073 |
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