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Astron. Astrophys. 361, L37-L39 (2000)


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Letter to the Editor

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

M. Revnivtsev 1,2, R. Sunyaev 2,1 and K. Borozdin 3,1

1 Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117810 Moscow, Russia
2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching bei München, Germany,
3 NIS-2, Los Alamos National Laboratory, NM 87545, USA

Received 11 May 2000 / Accepted 19 May 2000

Abstract

We found a strong QPO feature at [FORMULA] Hz in the power spectrum of an X-ray transient XTE J1118+480. The QPO was detected in PCA/RXTE data with an amplitude close to 10% rms, and width [FORMULA] Hz. The shape of the power spectrum is typical for black hole candidates: almost flat at frequencies lower than 0.03 Hz, roughly a power law with slope [FORMULA]1.2 from 0.03 to 1 Hz, with steepening to [FORMULA]1.6 at higher frequencies. The hard energy spectrum detected up to [FORMULA]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.

Key words: stars: binaries: general – stars: flare – stars: neutron – stars: individual: XTE J1806 – 246 – X-rays: stars

Send offprint requests to: revnivtsev@hea.iki.rssi.ru

© European Southern Observatory (ESO) 2000

Online publication: October 2, 2000

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