RXTE/PCA detection of QPO near 0.22 Hz in Aql X-1 during ongoing outburst

Details RXTE/PCA detection of QPO near 0.22 Hz in Aql X-1 during ongoing outburst RXTE/PCA detection of QPO near 0.22 Hz in Aql X-1 during ongoing outburst

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2902....1p&link_type=abstract

The Astronomer's Telegram, #2902

Other

X-Ray, Binaries, Neutron Stars, Transients, Stars

Scientific paper

We have analyzed eight RXTE/PCA archived observations (2-15 September 2010) of the current outburst of the neutron star Aql X-1 occurred during September 2010 (ATEL #2850, #2871). We have detected QPO near 0.22 Hz in the power density spectrum (with the frequency bin of 1/256 Hz) in one observation on 2nd September 2010 with a significance of 5.1sigma. The other parameters of the detected QPO feature are given below:

Central frequency	0.22+/-0.01 Hz
Width	0.041+/-0.008 Hz
Quality factor	5.36+/-1.11
rms amplitude	0.043+/-0.005

The background noise in the power spectrum is modeled with a constant+power-law combination with the constant value of 1.98+/-0.01 and power-law index of -0.54+/-0.06.

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