Discovery of 0.08 Hz QPO in the power spectrum of black hole candidate XTE J1118+480

Details Discovery of 0.08 Hz QPO in the power spectrum of black hole candidate XTE J1118+480 Discovery of 0.08 Hz QPO in the power spectrum of black hole candidate XTE J1118+480

2000-05-10

arxiv.org/abs/astro-ph/0005212v1

Astron.Astrophys.361:L37-L39,2000

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, submitted in A&A Letters

Scientific paper

We found a strong QPO feature at 0.085+/-0.002 Hz in the power spectrum of X-ray transient XTE J1118+480. The QPO was detected in PCA/RXTE data with an amplitude close to 10% rms, and the width 0.034+/-0.006 Hz. The shape of the power spectrum is typical for black hole candidates: almost flat at frequencies lower than 0.03 Hz, roughly power law with slope ~1.2 from 0.03 to 1 Hz, with a following steepening to ~1.6 at higher frequencies. The hard energy spectrum detected up to ~150 keV and the absence of significant X-ray variability at the high frequencies above 100 Hz strongly support the identification of XTE J1118+480 as black hole transient.

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