Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1404p&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #14.04; Bulletin of the American Astronomical Society, Vol. 26, p.1331
Astronomy and Astrophysics
Astronomy
Scientific paper
Using the wavelet transform, we analyzed the distribution and evolution of QSO's Lyalpha absorption lines. A multiresolution decomposition of Lyalpha forests with respect to the Daubechies 4 wavelet basis was done. The results showed that all considered samples of forest lines deviate from a uniform distribution at significance levels of 2-3 sigma , even in the case where the two-point correlation xi (r) of the lines showed very weak or ~ 0. The position and "richness" of structures (or "clusters") of forest lines up to the 3rd smoothing scales were identified. We found that the evolution of the number N of such clusters can also be approximately described by dN/dz ~ (1+z)(gamma ) . However, the index gamma is found to be scale-dependent: it is smaller for larger scales. For the 3rd decomposition, most samples show gamma < 0. This indicates that the evolution of large scale "clusters" of lines was opposed to the lines themselves. These results do not change significantly if a different wavelet, such as the Mallat wavelet, is used.
Fang Li-zhi
Pando Jesus
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