Low frequency QPO in GRO J1719--24

Details Low frequency QPO in GRO J1719--24 Low frequency QPO in GRO J1719--24

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18511606v&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #116.06; Bulletin of the American Astronomical Society, Vol. 26, p.1514

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present here the results of a time series analysis of the X-ray transient GRO J1719--24 (Nova Oph 1993) observed with the Burst And Transient Source Experiment (BATSE) onboard the Compton Gamma-Ray Observatory (CGRO). Our analysis covers the entire 80 day outburst, between 25 September and 14 December, 1993. We have analyzed an average of 35 source-on time intervals per day, each 512 bins of 1.024 seconds long between 20 - 100 keV. In total, about 1.5 * 10(6) seconds of data were selected during the outburst of GRO J1719--24. The corresponding FFT Power Density Spectra (PDS) cover the frequency range between 0.002 - 0.5 Hz. During the rise of the source, the PDS show a significant broad peak, indicative of quasi-periodic oscillations (QPO) in the time series. The centroid frequency of the QPO increased from ~ 45 mHz to ~ 80 mHz during the first week of the outburst and then increased gradually, but more slowly, to about ~ 120 mHz. The QPO are present in the PDS during the whole outburst of GRO J1719--24.

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