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High-mass X-ray binaries in the Milky Way : A closer look with INTEGRAL

Content Provider	Springer Nature Link
Author	Walter, Roland Lutoviv, Alexander A. Bozzo, Enrico Tsygankov, Sergey S.
Copyright Year	2015
Abstract	High-mass X-ray binaries are fundamental in the study of stellar evolution, nucleosynthesis, structure and evolution of galaxies and accretion processes. Hard X-rays observations by INTEGRAL and Swift have broadened significantly our understanding in particular for the super-giant systems in the Milky Way, whose number has increased by almost a factor of three. INTEGRAL played a crucial role in the discovery, study and understanding of heavily obscured systems and of fast X-ray transients. Most super-giant systems can now be classified into three categories: classical/obscured, eccentric and fast transient. The classical systems feature low eccentricity and variability factor of $${\sim }10^3$$ , mostly driven by hydrodynamic phenomena occurring on scales larger than the accretion radius. Among them, systems with short orbital periods and close to Roche-Lobe overflow or with slow winds appear highly obscured. In eccentric systems, the variability amplitude can reach even higher factors because of the contrast of the wind density along the orbit. Four super-giant systems, featuring fast outbursts, very short orbital periods and anomalously low accretion rates, are not yet understood. Simulations of the accretion processes on relatively large scales have progressed and reproduce parts of the observations. The combined effects of wind clumps, magnetic fields, neutron star rotation and eccentricity ought to be included in future modelling work. Observations with INTEGRAL in combination with other observatories were also important for detecting cyclotron resonant scattering features in spectra of X-ray pulsars, probing their variations and the geometry of the accretion column and emission regions. Finally, the unique characteristics of INTEGRAL and its long life time played a fundamental role for building a complete catalogue of HXMBs, to study the different populations of these systems in our Galaxy and to constrain some of the time scales and processes driving their birth and evolution.
Starting Page	1
Ending Page	98
Page Count	98
File Format	PDF
ISSN	09354956
Journal	The Astronomy and Astrophysics Review
Volume Number	23
Issue Number	1
e-ISSN	14320754
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	X-ray binaries Pulsars Mass loss and stellar winds Astronomy, Astrophysics and Cosmology Extraterrestrial Physics, Space Sciences Planetology Astrophysics and Astroparticles Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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