Volume 383, Number 1, FebruaryIII 2002
|Page(s)||L1 - L4|
|Published online||15 February 2002|
Letter to the Editor
A possible use of Fourier Transform analysis method as a distance estimator
Korea Institute for Advanced Study 207-43 Cheongryangri-dong, Dongdaemun-gu, Seoul 130-012, Korea e-mail: email@example.com
2 Center for Space Astrophysics and Department of Astronomy Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul 120-749, Korea e-mail: firstname.lastname@example.org
3 Korea Astronomy Observatory 36-1 Hwaam-dong, Yusong-gu, Taejon 305-348, Korea e-mail: email@example.com
Corresponding author: H.-Y. Chang, firstname.lastname@example.org
Accepted: 6 November 2001
We speculate on the possibility of using the Fourier transform analysis method as a distance estimator of the observed gamma-ray bursts (GRBs). It is based on a hypothetical empirical relation between the redshift and the power-law index of power density spectra (PDSs) of the observed GRBs. This relation is constructed by using the fact that the observed power-law index is dependent upon a characteristic timescale of GRB light curves. The rms error of redshift estimates is 0.42 for an empirical relation obtained with the 7 long () GRBs observed by the BATSE whose redshift information is available. We attempt to determine the spatial distribution of the GRBs observed by the BATSE as a function of redshifts on the basis of the resulting redshift estimator. We discuss possible uncertainties of the suggested method.
Key words: cosmology: theory / gamma rays: bursts / methods: data analysis
© ESO, 2002
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