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26 April 2024 |
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LYMAN-ALPHA FOREST CORRELATIONS USING NEIGHBOR COUNTS | | Avery Meiksin
; Francois R. Bouchet
; | | Date: |
6 May 1995 | | Journal: | Astrophys.J. 448 (1995) L85 | | Subject: | astro-ph | | Affiliation: | Chicago) and Francois R. Bouchet (Paris | | Abstract: | We present a novel technique for calculating the two-point autocorrelation function of the Lyman-alpha forest based on the relation between the two-point correlation function and the Neighbor Probability Distribution Functions. The technique appears to reduce the scatter in estimates of the correlation function by a factor of about two from the traditional pair-counting method. We apply the technique to the Lyman-alpha forest line lists determined from the spectra of seven z > 2 QSOs observed at high resolution ( < 25 km/s ). Of these, only two spectra, those of Q0055-259 and Q0014+813, appear to be sufficiently free of systematics to obtain meaningful estimates of the correlation function. We find positive correlations, with a maximum amplitude of 0.5 - 1, on the scale of 0.5 - 3 h^{-1} Mpc (comoving), or 100 - 600 km/s, in the forests of both QSOs. The technique also finds strong evidence for anticorrelation on the scale of 3 - 6 h^{-1} Mpc. The strength of the positive correlations is comparable to that predicted from the primordial power spectrum inferred from optically-selected galaxy redshift surveys. If the anticorrelations are physical, it becomes unclear whether the detected clustering is consistent with current models of structure formation with a homogeneous photoionizing UV metagalactic background. Instead, the anti-clustering may require inhomogeneity in the UV background, and possibly in the process of reionization itself. | | Source: | arXiv, astro-ph/9505033 | | Services: | Forum | Review | PDF | Favorites | |
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