Timing Analysis with INTEGRAL: Comparing Different Reconstruction Algorithms

V. Grinberg, I. Kreykenbohm, F. Fürst, J. Wilms, K. Pottschmidt, M. Cadolle Bel, J. Rodriguez, D. M. Marcu, S. Suchy, A. Markowitz, M. A. Nowak

Abstract


INTEGRAL is one of the few instruments capable of detecting X-rays above 20 keV. It is therefore in principle well suited for studying X-ray variability in this regime. Because INTEGRAL uses coded mask instruments for imaging, the reconstruction of light curves of X-ray sources is highly non-trivial. We present results from a comparison of two commonly employed algorithms, which primarily measure flux from mask deconvolution (ii_lc_extract) and from calculating the pixel illuminated fraction (ii_light). Both methods agree well for timescales above about 10 s, the highest time resolution for which image reconstruction is possible. For higher time resolution, ii light produces meaningful results, although the overall variance of the lightcurves is not preserved.

Keywords


timing analysis; instrumentation and methods; lightcurves; data extraction

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ISSN 1210-2709 (Print)
ISSN 1805-2363 (Online)
Published by the Czech Technical University in Prague