Three Harmonics of X-ray Quasi-periodic Oscillation seen in Swift/XRT and RXTE/PCA Observations of GX 339-4

Details Three Harmonics of X-ray Quasi-periodic Oscillation seen in Swift/XRT and RXTE/PCA Observations of GX 339-4 Three Harmonics of X-ray Quasi-periodic Oscillation seen in Swift/XRT and RXTE/PCA Observations of GX 339-4

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2556....1y&link_type=abstract

The Astronomer's Telegram, #2556

Astronomy and Astrophysics

Astronomy

5

Optical, Ultra-Violet, X-Ray, Transients

Scientific paper

The transient black hole candidate GX 339-4 is currently declining in the hard X-ray as seen with the Swift/BAT, while the soft X-ray flux seen with the RXTE/ASM has increased, giving the BAT/ASM daily flux ratio (in crab unit) reaches below 1.0 (see Yu & Yan 2009), continuing the trend that the source is leaving out of the hard state (see ATel #2545). Swift UVOT/XRT monitoring observations of the source in the past 20 days, aiming at fast optical/UV variability in the hard state and transition, was not able to detect rapid optical/UV variability which was suggested to correlate with the X-rays because of low source count rates (around 1 c/s in UVOT: UVW2 filter in event mode).

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