6533b821fe1ef96bd127ae5f
RESEARCH PRODUCT
Testing reflection features in 4U 1705-44 with XMM-Newton, BeppoSAX, and RXTE in the hard and soft states
Refiz DuroE. EgronSantina PirainoSara MottaN. R. RobbaR. IariaT. M. BelloniA. D'aiAndrea SantangeloLuciano BurderiT. Di SalvoA. PapittoAlessandro Riggiosubject
High Energy Astrophysical Phenomena (astro-ph.HE)PhysicsSpectral shape analysis010308 nuclear & particles physicsAstrophysics::High Energy Astrophysical PhenomenaResolution (electron density)FOS: Physical sciencesFluxAstronomy and AstrophysicsAstrophysicsRadius01 natural sciencesSettore FIS/05 - Astronomia E AstrofisicaSoft stateSpace and Planetary Science0103 physical sciencesformation line: identification stars: neutron stars: individual: 4U 1705-44 X-rays: binaries X-rays: general [line]Reflection (physics)Thick diskline: formation line: identification stars: neutron stars: individual: 4U 1705-44 X-rays: binaries X-rays: generalAstrophysics - High Energy Astrophysical Phenomena010303 astronomy & astrophysicsEnergy (signal processing)description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-11-13 |