2003–2005INTEGRALandXMM-Newtonobservations of 3C 273
| Autor: | M. Stuhlinger, Volker Beckmann, K. L. Page, Simona Soldi, Thierry J.-L. Courvoisier, Maria Chernyakova, Andrii Neronov, Ruediger Staubert, Ian M. McHardy, P. Lubinski, Marc Türler, R. Walter |
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| Přispěvatelé: | ISDC Data Centre for Astrophysics, University of Geneva [Switzerland], INTEGRAL Science Data Center (ISDC), Geneva Observatory, University of Geneva [Switzerland]-University of Geneva [Switzerland], NASA Goddard Space Flight Center (GSFC), Department of Physics and Astronomy [Leicester], University of Leicester, Agence Spatiale Européenne (ESA), European Space Agency (ESA), Institut für Astronomie und Astrophysik [Tübingen] (IAAT), Eberhard Karls Universität Tübingen = Eberhard Karls University of Tuebingen, School of Physics and Astronomy [Southampton], University of Southampton |
| Rok vydání: | 2007 |
| Předmět: |
Physics
Photon [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Context (language use) Quasar Astrophysics 01 natural sciences Power law [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] quasars: individual: 3C 273 Space and Planetary Science 0103 physical sciences Broadband Reflection (physics) Black-body radiation Blazar 010303 astronomy & astrophysics |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2007, 465, pp.147-156. ⟨10.1051/0004-6361:20066285⟩ |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361:20066285 |
| Popis: | The aim of this paper is to study the evolution of the broadband spectrum of one of the brightest and nearest quasars 3C 273. We analyze the data obtained during quasi-simultaneous INTEGRAL and XMM monitoring of the blazar 3C 273 in 2003--2005 in the UV, X-ray and soft gamma-ray bands and study the results in the context of the long-term evolution of the source. The 0.2-100 keV spectrum of the source is well fitted by a combination of a soft cut-off power law and a hard power law. No improvement of the fit is achieved if one replaces the soft cut-off power law by either a blackbody, or a disk reflection model. During the observation period the source has reached the historically softest state in the hard X-ray domain with a photon index $\Gamma=1.82\pm 0.01$. Comparing our data with available archived X-ray data from previous years, we find a secular evolution of the source toward softer X-ray emission (the photon index has increased by $\Delta\Gamma\simeq 0.3-0.4$ over the last thirty years). We argue that existing theoretical models have to be significantly modified to account for the observed spectral evolution of the source. Comment: 11 pages, accepted to A&A |
| Databáze: | OpenAIRE |
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