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Kilohertz QPOs and general-relativistic orbital motion—a maximum likelihood test

Published online by Cambridge University Press:  12 April 2016

Tomasz Bulik
Tomasz Bulik*
Affiliation:
Nicolaus Copernicus Astronomical Center, Bartycka 18, 00716 Warsaw, Poland

Abstract

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Using the maximum likelihood method we show that the observed distribution of maximum frequencies of kilohertz quasi periodic oscillations (QPOs) in LMXBs agrees with the frequencies of orbital motion in the marginally stable orbit around compact objects with masses chosen randomly from some interval, which we find to be (1.55 M⊙, 2.40 M⊙) at the 99% confidence level. As this remarkable agreement with the expected mass range of neutron stars in LMXBs demonstrates, the assumption that the maximum-frequency QPOs occur in the marginally stable orbit is consistent with the current data set.

Type
Part 9. Population and Neutron Star Properties
Information
International Astronomical Union Colloquium , Volume 177: Pulsar Astronomy - 2000 and Beyond , 2000 , pp. 649 - 650
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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