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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
On the fe K absorption-accretion state connection in the galactic centre neutron star X-ray binary AX J1745.6-2901
Monthly Notices of the Royal Astronomical Society, Volume 446, No. 2, Year 2015
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Description
AXJ1745.6-2901 is a high-inclination (eclipsing) neutron star low-massX-ray binary (LMXB) located less than ~1.5 arcmin from Sgr A*. Ongoing monitoring campaigns have targeted Sgr A* frequently and these observations also cover AX J1745.6-2901. We present here an X-ray analysis of AX J1745.6-2901 using a large data set of 38 XMM-Newton observations, including 11 which caught AX J1745.6-2901 in outburst. Fe K absorption is clearly seen when AX J1745.6-2901 is in the soft state, but disappears during the hard state. The variability of these absorption features does not appear to be due to changes in the ionizing continuum. The small Ka/Kß ratio of the equivalent widths of the Fe XXV and Fe XXVI lines suggests that the column densities and turbulent velocities of the absorbing ionized plasma are in excess of NH ≃ 1023 cm-2 and vturb ≳ 500 km s-1. These findings strongly support a connection between the wind (Fe K absorber) and the accretion state of the binary. These results reveal strong similarities between AX J1745.6-2901 and the eclipsing neutron star LMXB, EXO 0748-676, as well as with high-inclination black hole binaries, where winds (traced by the same Fe K absorption features) are observed only during the accretion-disc-dominated soft states, and disappear during the hard states characterized by jet emission. © 2014 The Authors.
Authors & Co-Authors
Ponti, Gabriele
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Muñoz-Darías, Teodoro
United Kingdom, Oxford
University of Oxford
de Marco, Barbara
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Dwelly, Tom
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Fender, Robert P.
United Kingdom, Oxford
University of Oxford
Nandra, Kirpaul P.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Rea, Nanda
Netherlands, Amsterdam
Universiteit Van Amsterdam
Spain, Barcelona
Csic - Instituto de Ciencias Del Espacio Ice
Haggard, Daryl
United States, Evanston
Northwestern University
Heinke, Craig O.
Canada, Edmonton
University of Alberta
Degenaar, Nathalie D.
United States, Ann Arbor
University of Michigan, Ann Arbor
Clavel, Maïca
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Hailey, Charles J.
United States, New York
Columbia University
Israel, G. L.
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Morris, Mark R.
United States, Los Angeles
University of California, Los Angeles
Rushton, Anthony P.
United Kingdom, Oxford
University of Oxford
United Kingdom, Southampton
University of Southampton
Terrier, Régis
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Statistics
Citations: 38
Authors: 16
Affiliations: 14
Identifiers
Doi:
10.1093/mnras/stu1853
ISSN:
00358711
Research Areas
Environmental