Comparing Black Hole and Neutron Star Variability |
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| Authors: | M Van Der Klis |
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| Institution: | (1) Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands |
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| Abstract: | There are remarkable similarities between the rapid X-ray variability of low-magnetic field neutron stars in low mass X-ray
binaries, and that of black holes. In particular at frequencies < 100 Hz, their power spectra can be strikingly similar. The
highest frequency phenomena (kilohertz QPOs, black hole high-frequency QPOs and neutron star hectohertz QPOs) are the ones
that show most differences, perhaps because they originate closest to the compact object. Most variability components vary
in frequency in correlation with one another, and the correlations once again are very similar across neutron stars and black
holes – some extend even to white dwarfs. Although this does not strictly require that all phenomena whose frequencies are
involved are caused by the same physics in all three source types, this does indicate that basic properties of the accretion
flow which are the same in all three source types play an important role in generating at least some of the frequencies. |
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| Keywords: | X-rays neutron stars black holes rapid variability QPO |
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