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RXTE-PCA observations of XMMU J054134.7-682550

RXTE-PCA observations of XMMU J054134.7-682550
RXTE-PCA observations of XMMU J054134.7-682550
We analysed Rossi X-ray Timing Explorer Proportional Counter Array observations of a recent outburst of the X-ray pulsar XMMU J054134.7?682550. We calculated the pulse frequency history of the source. We found no sign of a binary companion. The source spins up when the X-ray flux is higher, with a correlation between the spin-up rate and X-ray flux, which may be interpreted as a sign of an accretion disc. On the other hand, the source was found to have an almost constant spin frequency when the X-ray flux is lower without any clear sign of a spin-down episode. The decrease in pulsed fraction with decreasing X-ray flux was interpreted as a sign of accretion geometry change, but we did not find any evidence of a transition from accretor to propeller regimes. The source was found to have variable pulse profiles. Two peaks in pulse profiles were usually observed. We studied the X-ray spectral evolution of the source throughout the observation. Pulse-phase-resolved analysis does not provide any further evidence for a cyclotron line, but may suggest a slight variation of intensity and width of the 6.4 keV iron line with phase.

accretion, accretion discs, stars: neutron, pulsars: individual: XMMU J054134.7?682550, X-rays: binaries
0035-8711
1662-1668
İnam, S.Ç.
2673cab5-c3ec-4dad-a3cd-6bc7eb0b46c6
Townsend, Lee J.
383d1487-54d3-4912-82d3-1cc3b4b28d5e
McBride, V.A.
36106df1-eae1-4eff-974e-2aba84523b85
Baykal, A.
e7fea907-6b52-4837-8902-cb18174fa006
Coe, Malcolm J.
04dfb23b-1456-46a3-9242-5cee983471d5
Corbet, R.H.D.
7d365a78-a577-4f56-8d3a-503b7fccb42b
İnam, S.Ç.
2673cab5-c3ec-4dad-a3cd-6bc7eb0b46c6
Townsend, Lee J.
383d1487-54d3-4912-82d3-1cc3b4b28d5e
McBride, V.A.
36106df1-eae1-4eff-974e-2aba84523b85
Baykal, A.
e7fea907-6b52-4837-8902-cb18174fa006
Coe, Malcolm J.
04dfb23b-1456-46a3-9242-5cee983471d5
Corbet, R.H.D.
7d365a78-a577-4f56-8d3a-503b7fccb42b

İnam, S.Ç., Townsend, Lee J., McBride, V.A., Baykal, A., Coe, Malcolm J. and Corbet, R.H.D. (2009) RXTE-PCA observations of XMMU J054134.7-682550. Monthly Notices of the Royal Astronomical Society, 395 (3), 1662-1668. (doi:10.1111/j.1365-2966.2009.14659.x).

Record type: Article

Abstract

We analysed Rossi X-ray Timing Explorer Proportional Counter Array observations of a recent outburst of the X-ray pulsar XMMU J054134.7?682550. We calculated the pulse frequency history of the source. We found no sign of a binary companion. The source spins up when the X-ray flux is higher, with a correlation between the spin-up rate and X-ray flux, which may be interpreted as a sign of an accretion disc. On the other hand, the source was found to have an almost constant spin frequency when the X-ray flux is lower without any clear sign of a spin-down episode. The decrease in pulsed fraction with decreasing X-ray flux was interpreted as a sign of accretion geometry change, but we did not find any evidence of a transition from accretor to propeller regimes. The source was found to have variable pulse profiles. Two peaks in pulse profiles were usually observed. We studied the X-ray spectral evolution of the source throughout the observation. Pulse-phase-resolved analysis does not provide any further evidence for a cyclotron line, but may suggest a slight variation of intensity and width of the 6.4 keV iron line with phase.

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More information

Published date: 8 April 2009
Keywords: accretion, accretion discs, stars: neutron, pulsars: individual: XMMU J054134.7?682550, X-rays: binaries
Organisations: University of Southampton

Identifiers

Local EPrints ID: 143561
URI: http://eprints.soton.ac.uk/id/eprint/143561
ISSN: 0035-8711
PURE UUID: 89134eee-5e71-4747-8e0c-f5af95760fad
ORCID for Malcolm J. Coe: ORCID iD orcid.org/0000-0002-0763-8547

Catalogue record

Date deposited: 12 Apr 2010 13:58
Last modified: 07 Oct 2020 02:40

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Contributors

Author: S.Ç. İnam
Author: Lee J. Townsend
Author: V.A. McBride
Author: A. Baykal
Author: Malcolm J. Coe ORCID iD
Author: R.H.D. Corbet

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