Testing reflection features in 4U 1705-44 with XMM-Newton, BeppoSAX, and RXTE in the hard and soft states
| Autor: | Refiz Duro, E. Egron, Santina Piraino, Sara Motta, N. R. Robba, R. Iaria, T. M. Belloni, A. D'Ai, Andrea Santangelo, Luciano Burderi, T. Di Salvo, A. Papitto, Alessandro Riggio |
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| Přispěvatelé: | Egron, E, Di Salvo, T, Motta, S, Burderi, L, Papitto, A, Duro, R, D'Aì, A, Riggio, A, Belloni, T, Iaria, R, Robba, N, Piraino, S, Santangelo, A |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Spectral shape analysis 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Resolution (electron density) FOS: Physical sciences Flux Astronomy and Astrophysics Astrophysics Radius 01 natural sciences Settore FIS/05 - Astronomia E Astrofisica Soft state Space and Planetary Science 0103 physical sciences formation line: identification stars: neutron stars: individual: 4U 1705-44 X-rays: binaries X-rays: general [line] Reflection (physics) Thick disk line: formation line: identification stars: neutron stars: individual: 4U 1705-44 X-rays: binaries X-rays: general Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Energy (signal processing) |
| Popis: | We use data of the bright atoll source 4U 1705-44 taken with XMM-Newton, BeppoSAX and RXTE both in the hard and in the soft state to perform a self-consistent study of the reflection component in this source. Although the data from these X-ray observatories are not simultaneous, the spectral decomposition is shown to be consistent among the different observations, when the source flux is similar. We therefore select observations performed at similar flux levels in the hard and soft state in order to study the spectral shape in these two states in a broad band (0.1-200 keV) energy range, with good energy resolution, and using self-consistent reflection models. These reflection models provide a good fit for the X-ray spectrum both in the hard and in the soft state in the whole spectral range. We discuss the differences in the main spectral parameters we find in the hard and the soft state, respectively, providing evidence that the inner radius of the optically thick disk slightly recedes in the hard state. Accepted for publication in A&A, 20 pages, 12 figures |
| Databáze: | OpenAIRE |
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