Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1248..155d&link_type=abstract
X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Confer
Astronomy and Astrophysics
Astronomy
Neutron Stars, Binary Stars, Accretion Disks, Magnetic Fields, Neutron Stars, X-Ray Binaries, Accretion And Accretion Disks, Magnetic And Electric Fields, Polarization Of Starlight
Scientific paper
The angular momentum of matter accreting onto the neutron star produces significant spin-up torque. Effective braking mechanism must exist to balance it in order to explain the existence of slowly-rotating X-ray pulsars. The efficiency of breaking steeply decreases with the rotational frequency and the magnetic field strength. Slowly rotating sources like GX 301-2 must therefore be highly magnetized (B~1014G), which is in apparent contradiction with the field estimate from the position of a cyclotron line observed in GX 301-2 (B~3×1012G). We suggest that this contradiction may be resolved if the line forming region resides in an accretion column of significant height [1]. We investigate this hypothesis using INTEGRAL and BATSE observations and conclude, that the field at the top of the column shall be weak enough to explain the observed cyclotron line energy.
Doroshenko Victor
Ferrigno Carlo
Klochkov Dmitry
Kreykenbohm Ingo
Santangelo Andrea
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