Search results for "X-ray: spectrum"

showing 3 items of 3 documents

Spectral Evolution of Scorpio X‐1 along its Color‐Color Diagram

2007

We analyze a large collection of RXTE archive data of the bright X‐ray source Scorpius X‐1 in order to study the broadband spectral evolution of the source for different values of the inferred mass accretion rate by selecting energy spectra from its Color‐Color Diagram. We model the spectra with the combination of two absorbed components: a soft thermal component, which can be interpreted as thermal emission from an accretion disk, and a hybrid Comptonization component, which self‐consistently includes the Fe Kα fluorescence line and the Compton reflected continuum. The presence of hard emission in Scorpius X‐1 has been previously reported, however, without a clear relation with the accreti…

PhysicsAccretion (meteorology)Astrophysics::High Energy Astrophysical PhenomenaContinuum (design consultancy)X-ray: generalCompton scatteringX-ray binaryColor–color diagramAstrophysicsindividual: Scorpio X-1; Stars: neutron stars; X-ray: general; X-ray: spectrum; X-ray: stars [Accretion discs; Stars]X-ray: spectrumAstronomical spectroscopySpectral lineStars: neutron starX-ray: starsAccretion discStars: individual: Scorpio X-1Astrophysics::Galaxy AstrophysicsLine (formation)AIP Conference Proceedings
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A self-consistent approach to the reflection component in 4U 1705-44

2010

High-resolution spectroscopy has recently revealed in many neutron-star Low-Mass X-ray binaries that the shape of the broad iron line observed in the 6.4-6.97 keV range is consistently well fitted by a relativistically smeared line profile. We show here spectral fitting results using a newly developed self-consistent reflection model on XMM-Newton data of the LMXB 4U 1705-44 during a period when the source was in a bright soft state. This reflection model adopts a blackbody prescription for the shape of the impinging radiation field, that we physically associate with the boundary layer emission. © 2010 American Institute of Physics.

Physicsindividual: 4U 1705-44; stars: neutron stars; X-ray: general; X-ray: spectrum; X-ray: stars; Physics and Astronomy (all) [accretion discs; stars]stars: neutron starAstrophysics::High Energy Astrophysical PhenomenaX-ray: generalX-ray binaryCosmic background radiationX-ray: starAstrophysicsX-ray: spectrumstars: individual: 4U 1705-44Interstellar mediumPhysics and Astronomy (all)accretion discReflection (physics)Black-body radiationInfrared cirrusSpectroscopyLine (formation)
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Relativistically Smeared Iron Lines in the Spectra of Bright NS LMXB

2009

We present preliminary results of a study on three bright accreting low-mass X-ray binaries hosting a neutron star, based on XMM-Newton observations. These sources (GX 340+0, GX 349+2 and SAX J1808.4-3658) show a broad Fe K alpha iron line in their spectra. This feature can be well described by relativistic line profile in each case; the good spectral resolution of the EPIC/PN and the high statistics spectra allow to put very good constraints on the disk geometry and ionization stage of the reflecting matter.

Physicsstars: neutron starAstrophysics::High Energy Astrophysical Phenomenastars: individual: GX 340+0 GX 349+2 SAX J1808.4-3658X-ray: starAstronomyAstrophysicsEPICX-ray: spectrumSpectral lineNeutron starSettore FIS/05 - Astronomia E Astrofisicaindividual: GX 340+0 GX 349+2 SAX J1808.4-3658; stars: neutron stars; X-ray: stars; X-ray: spectrum; [accretion disks; stars]PulsarIonizationSpectral resolutionSpectroscopyaccretion diskLine (formation)
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