XMM-Newton observations of GX 13+1: correlation between photoionised absorption and broad line emission

Abstract

We analysed data from five XMM-Newton observations of GX 13+1 to investigate the variability of the photo-ionised absorber present in this source. We fitted EPIC and RGS spectra obtained from the "least-variable" intervals with a model consisting of disc-blackbody and blackbody components together with a Gaussian emission feature at ~6.55-6.7 keV modified by absorption due to cold and photo-ionised material. We found a significant correlation between the hard, ~6-10 keV, flux, the ionisation and column density of the absorber and the equivalent width of the broad iron line. We interpret the correlation in a scenario in which a disc wind is thermally driven at large, ~10^{10} cm, radii and the broad line results from reprocessed emission in the wind and/or hot atmosphere. The breadth of the emission line is naturally explained by a combination of scattering, recombination and fluorescence processes. We attribute the variations in the absorption and emission along the orbital period to the view of different parts of the wind, possibly located at slightly different inclination angles. We constrain the inclination of GX 13+1 to be between 60 and 80 degrees from the presence of strong absorption in the line of sight, that obscures up to 80% of the total emission in one observation, and the absence of eclipses. We conclude that the presence of a disc wind and/or a hot atmosphere can explain the current observations of narrow absorption and broad iron emission features in neutron star low mass X-ray binaries as a class.

Accepted for publication in Astronomy and Astrophysics

References in corpus (16)

• X-ray reflected spectra from accretion disk models. I. Constant density atmospheres
• Evidence for ultra-fast outflows in radio-quiet AGNs: II - detailed photo-ionization modeling of Fe K-shell absorption lines
• Evaluating Spectral Models and the X-ray States of Neutron-Star X-ray Transients
• Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows III: application to a hydrodynamical simulation
• X-ray reflected spectra from accretion disk models.II. Diagnostic tools for X-ray observations
• Spectrum Synthesis Modeling of the X-ray Spectrum of GRO J1655-40 Taken During the 2005 Outburst
• Average hard X-ray emission from NS LMXBs: Observational evidence of different spectral states in NS LMXBs
• A systematic analysis of the broad Fe Kalpha line in neutron star LMXBs with XMM-Newton
• A Fast X-ray Disk Wind in the Transient Pulsar IGR J17480-2446 in Terzan 5
• Effects of Downscattering on the Continuum and Line Spectra in Powerful Wind Environment. Monte Carlo Simulations, Analytical Results and Data Analysis
• SPH simulations of irradiation-driven warped accretion discs and the long periods in X-ray binaries
• Variations in the dip properties of the low-mass X-ray binary XB 1254-69 observed with XMM-Newton and INTEGRAL
• The accretion disk corona and disk atmosphere of 4U 1624-490 as viewed by the Chandra-HETGS
• Properties of the 24 Day Modulation in GX 13+1 from Near-Infrared and X-ray Observations
• Chandra Observation of the Dipping Source XB 1254-690
• Detection of Highly Ionized Metal Absorption Lines in the Ultracompact X-ray Dipper 4U 1916-05

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