On the Correlation between 45 Hz QPO and NBO on the Normal Branch in Sco X-1

Details On the Correlation between 45 Hz QPO and NBO on the Normal Branch in Sco X-1 On the Correlation between 45 Hz QPO and NBO on the Normal Branch in Sco X-1

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17093y&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

On the normal branch of Sco X-1, the Fourier power spectra of the RXTE/PCA observations have shown a 6--8 Hz normal branch QPO (NBO), a 45 Hz QPO and twin kHz QPOs simultaneously. The kHz QPOs and the NBOs are correlated (see Yu, van der Klis and Jonker, 2001). Here we show that the amplitude of the 45 Hz QPO, which was suspected as the horizontal branch oscillations (HBOs), is also correlated with the NBOs, but in a manner opposite to the lower kHz QPOs. We briefly discuss the consequence of the discovery.

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