Samenvatting
Kilohertz quasi-periodic oscillations (kHz QPOs) and broad iron emission
lines are thought to be produced at the inner edge of an accretion disk
around neutron stars in low mass X-ray binary systems (LMXBs). The
frequency of kHz QPOs and the width of iron lines strongly suggest that
these phenomena take place just few kilometers above the surface of the
neutron star and hence they should probe the strong gravitational field
around these stars. Both QPO variability and iron line hold the promise
of searching for signatures of strong-field general relativity, e.g. the
ISCO or Lense-Thirring precession. Here I present new results of the kHz
QPOs in the transient neutron star LMXB XTE J1701-462, and the kHz QPOs
and the broad iron line in the persistent neutron star LMXB 4U 1636-53.
In XTE J1701 we find that, contrary to previous claims, properties of
the kHz QPO are probably not uniquely determined by the geometry of the
space-time. In 4U 1636 we find that there is a complex relation between
kHz QPOs and properties of the iron line, which is difficult to explain
if both phenomena reflect properties of the same region in the accretion
disk.
Originele taal-2 | English |
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Pagina's | 3703 |
Status | Published - 2010 |
Evenement | 38th COSPAR Scientific Assembly. Held 18-15 July 2010, in Bremen, Germany, p.6 - , Germany Duur: 15-jul.-2010 → … |
Conference
Conference | 38th COSPAR Scientific Assembly. Held 18-15 July 2010, in Bremen, Germany, p.6 |
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Land/Regio | Germany |
Periode | 15/07/2010 → … |