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Recurrent ∼24 h Periods in RXTE ASM Data

Published online by Cambridge University Press:  05 March 2013

Sean A. Farrell ,
Paul M. O'Neill  and
Ravi K. Sood
Sean A. Farrell*
Affiliation:
School of Physical, Environmental & Mathematical Sciences, University of New South Wales, Australian Defence Force Academy (UNSW@ADFA), Canberra ACT 2600, Australia
Paul M. O'Neill
Affiliation:
Astrophysics Group, Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
Ravi K. Sood
Affiliation:
School of Physical, Environmental & Mathematical Sciences, University of New South Wales, Australian Defence Force Academy (UNSW@ADFA), Canberra ACT 2600, Australia
*
CCorresponding author. Email: s.farrell@adfa.edu.au
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Abstract

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Analysis of data from the Rossi X-ray Timing Explorer satellite's All Sky Monitor (ASM) instrument for several X-ray binary sources has identified a recurrent ∼24 h period. This period is sometimes highly significant, giving rise to the possibility of it being identified as an orbital or super-orbital period. Further analysis has revealed the same period in a number of other X-ray sources. As a result this period has been discounted as spurious, described variously as arising from daily variations in background levels, the scheduling of ASM observations and beating between the sampling period and long-term secular trends in the light curves. We present here an analysis of the spurious periods and show that the dominant mechanism is in fact spectral leakage of low-frequency power present in the light curves.

Keywords

instrumentation: miscellaneousmethods: data analysisspace vehicles: instrumentstechniques: miscellaneoustelescopesX-rays: binaries
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 22 , Issue 3: Featuring Gravity Workshop 2004 , 2005 , pp. 267 - 276
Copyright
Copyright © Astronomical Society of Australia 2005

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