Volume 528, April 2011
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||28 February 2011|
Bayesian timing analysis of giant flare of SGR 180620 by RXTE PCA
Astrophysikalisches Institut und Universitäts-Sternwarte, Universität
2 Theoretical Astrophysics, Eberhard-Karls-Universität Tübingen, 72076 Tübingen, Germany
Received: 24 June 2010
Accepted: 26 December 2010
Aims. By detecting high-frequency quasi-periodic oscillations (QPOs) and estimating their frequencies during the decaying tail of giant flares from soft gamma-ray repeaters (SGRs) useful constraints for the equation of state (EoS) of superdense matter may be obtained via comparison with theoretical predictions of eigenfrequencies.
Methods. We used the data collected by the Rossi X-Ray Timing Explorer (RXTE/XTE) Proportional Counter Array (PCA) of a giant flare of SGR 1806−20 on 2004 Dec. 27 and applied an existing Bayesian periodicity detection method to search for oscillations of a transient nature.
Results. In addition to the already detected frequencies, we found a few new frequencies (fQPOs ~ 16.9,21.4,36.4,59.0,116.3 Hz) of predicted oscillations based on the APR14 EoS for SGR 1806−20.
Key words: stars: magnetars / stars: oscillations / X-rays: bursts / methods: data analysis / methods: statistical
© ESO, 2011
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