Muñoz-Darias, T. ; Motta, S. ; Pawar, D. ; Belloni, T. M. ; Campana, S. ; Bhattacharya, D. (2010) The hard state of black hole candidates: XTE J1752−223 Monthly Notices of the Royal Astronomical Society: Letters, 404 (1). L94-L98. ISSN 1745-3925
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Official URL: http://doi.org/10.1111/j.1745-3933.2010.00842.x
Related URL: http://dx.doi.org/10.1111/j.1745-3933.2010.00842.x
Abstract
We present a 2-day long Rossi X-ray Timing Explorer observation and simultaneous Swift data of the bright X-ray transient XTEJ1752–223. Spectral and timing properties were stable during the observation. The energy spectrum is well described by a broken power law with a high-energy cut-off. A cold disc (∼0.3 keV) is observed when Swift/X-Ray Telescope data are considered. The fractional root mean square amplitude of the aperiodic variability (0.002–128Hz) is 48.2 ± 0.1 per cent, and it is not energy dependent. The continuum of the power density spectrum can be fitted by using four broad-band Lorentzians. A high-frequency (∼21Hz) component and two weak quasi-periodic oscillation-like features are also present. Time lags between soft and hard X-rays roughly follow the relation Δt∝ν−0.7, with delays dropping from ∼0.5 (0.003Hz) to ∼0.0015 (≥10 Hz) s. Our results are consistent with XTEJ1752–223 being a black hole candidate, with all timing and spectral components very similar to those of Cyg X-1 during its canonical hard state.
Item Type: | Article |
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Source: | Copyright of this article belongs to John Wiley and Sons. |
ID Code: | 133934 |
Deposited On: | 02 Jan 2023 11:29 |
Last Modified: | 02 Jan 2023 11:29 |
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