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The hard state of black hole candidates: XTEJ1752-223

The hard state of black hole candidates: XTEJ1752-223
The hard state of black hole candidates: XTEJ1752-223
We present a 2-day long Rossi X-ray Timing Explorer observation and simultaneous Swift data of the bright X-ray transient XTE J1752–223. 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 (0.002–128 Hz) 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 (?21 Hz) component and two weak quasi-periodic oscillation-like features are also present. Time lags between soft and hard X-rays roughly follow the relation ?t???0.7, with delays dropping from ?0.5 (0.003 Hz) to ?0.0015 (?10 Hz) s. Our results are consistent with XTE J1752–223 being a black hole candidate, with all timing and spectral components very similar to those of Cyg X-1 during its canonical hard state.
accretion, accretion discs, black hole physics, binaries: close, stars: individual: XTEJ1752-223, X-rays: stars
1745-3925
L94-L98
Munoz -Darias, T.
3ef561c1-bb1b-4616-8d6c-1e5dc2da1874
Motta, S.
461dbdce-0b15-4702-8baf-85b26197ae36
Pawar, D.
c24afec9-de46-409d-9c68-d0197ae5fb85
Belloni, T.M.
7cbbc962-d7e9-4823-ac14-7c662aa9eb16
Campana, S.
e4a1e868-5b27-48c6-af9d-ea433a148e7c
Bhattacharya, D.
e6c66a0a-6e3c-468d-89d6-ea8e3994d9f2
Munoz -Darias, T.
3ef561c1-bb1b-4616-8d6c-1e5dc2da1874
Motta, S.
461dbdce-0b15-4702-8baf-85b26197ae36
Pawar, D.
c24afec9-de46-409d-9c68-d0197ae5fb85
Belloni, T.M.
7cbbc962-d7e9-4823-ac14-7c662aa9eb16
Campana, S.
e4a1e868-5b27-48c6-af9d-ea433a148e7c
Bhattacharya, D.
e6c66a0a-6e3c-468d-89d6-ea8e3994d9f2

Munoz -Darias, T., Motta, S., Pawar, D., Belloni, T.M., Campana, S. and Bhattacharya, D. (2010) The hard state of black hole candidates: XTEJ1752-223. Monthly Notices of the Royal Astronomical Society: Letters, 404 (1), L94-L98. (doi:10.1111/j.1745-3933.2010.00842.x).

Record type: Article

Abstract

We present a 2-day long Rossi X-ray Timing Explorer observation and simultaneous Swift data of the bright X-ray transient XTE J1752–223. 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 (0.002–128 Hz) 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 (?21 Hz) component and two weak quasi-periodic oscillation-like features are also present. Time lags between soft and hard X-rays roughly follow the relation ?t???0.7, with delays dropping from ?0.5 (0.003 Hz) to ?0.0015 (?10 Hz) s. Our results are consistent with XTE J1752–223 being a black hole candidate, with all timing and spectral components very similar to those of Cyg X-1 during its canonical hard state.

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e-pub ahead of print date: 25 March 2010
Published date: May 2010
Keywords: accretion, accretion discs, black hole physics, binaries: close, stars: individual: XTEJ1752-223, X-rays: stars
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 339070
URI: http://eprints.soton.ac.uk/id/eprint/339070
ISSN: 1745-3925
PURE UUID: d0884c91-9a72-479a-945e-710c1cc224a4

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Date deposited: 24 May 2012 08:53
Last modified: 14 Mar 2024 11:09

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Contributors

Author: T. Munoz -Darias
Author: S. Motta
Author: D. Pawar
Author: T.M. Belloni
Author: S. Campana
Author: D. Bhattacharya

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