Search results for "LINE: PROFILE"

showing 3 items of 13 documents

A TEST of the NATURE of the FE K LINE in the NEUTRON STAR LOW-MASS X-RAY BINARY SERPENS X-1

2015

Broad Fe K emission lines have been widely observed in the X-ray spectra of black hole systems, and in neutron star systems as well. The intrinsically narrow Fe K fluorescent line is generally believed to be part of the reflection spectrum originating in an illuminated accretion disk, and broadened by strong relativistic effects. However, the nature of the lines in neutron star LMXBs has been under debate. We therefore obtained the longest, high-resolution X-ray spectrum of a neutron star LMXB to date with a 300 ks Chandra HETGS observation of Serpens X-1. The observation was taken under the "continuous clocking" mode and thus free of photon pile-up effects. We carry out a systematic analys…

SerpensAstrophysics::High Energy Astrophysical PhenomenaX-ray binaryFOS: Physical sciencesAstrophysicsaccretion accretion disk01 natural sciencesSpectral linestars: neutronSettore FIS/05 - Astronomia E Astrofisica0103 physical sciencesEmission spectrum010303 astronomy & astrophysicsLine (formation)High Energy Astrophysical Phenomena (astro-ph.HE)Physics010308 nuclear & particles physicsAstronomy and Astrophysicsprofiles; stars: neutron; X-rays: binaries; Astronomy and Astrophysics; Space and Planetary Science [accretion accretion disks; line]Astronomy and AstrophysicK-lineX-rays: binarieBlack holeNeutron starline: profileSpace and Planetary ScienceAstrophysics - High Energy Astrophysical Phenomena
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A Spectral Insight into the Physics of Accreting ms Pulsars

2010

The broadened iron lines observed from accreting compact objects are most easily interpreted in terms of reflection onto the accretion disc of the hard X-ray photons emitted by the central source. In this context, such a broadness is due to the relativistic motion of the reflecting plasma, in the deep gravitational well of the compact object, and can thus serve as a probe of the inner radius of the disc. Here we report about the discovery of such features from a couple of accreting millisecond pulsars, and discuss the constraints which can be derived on the magnetospheric radius.

X-rays: binariesSettore FIS/05 - Astronomia E Astrofisicaline: profileprofiles; X-rays: binaries [accretion accretion disks; line]accretion accretion disk
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Spectral analysis of the AMXP during its 2018 outburst

2023

The Accreting Millisecond X-ray Pulsar IGR J17591-2342 is a Low Mass X-ray Binary (LMXB) system that went in outburst on 2018 August and it was monitored by the NICER observatory and partially by other facilities. We aim to study how the spectral emission of this source evolved during the outburst by exploiting the whole X-ray data repository of simultaneous observations. The continuum emission of the combined broad-band spectra is on average well described by an absorbed Comptonization component scattering blackbody-distributed photons peaking at (0.8 +/- 0.5) keV by a moderately optically thick corona (tau = 2.3 +/- 0.5) with temperature of (34 +/- 9) keV. A blackbody component with tempe…

stars: neutronX-rays: binariesSettore FIS/05 - Astronomia E Astrofisicaline: profilesline: formationstars: individual: IGR J17591-2342
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