期刊
ASTROPHYSICAL JOURNAL
卷 629, 期 1, 页码 L25-L28出版社
IOP PUBLISHING LTD
DOI: 10.1086/444377
关键词
galaxies : evolution; quasars : absorption lines
We present a pilot study of the clustering properties of Ly alpha absorbers with respect to known galaxies based on 112 Ly alpha absorbers and 482 galaxies identified at z < 0.5 along the sight line toward PKS 0405 - 123. The principal goal is to determine the origin of Ly alpha absorbers based on their cross-correlation amplitude with known galaxies and to investigate a possible N(H I) dependence of the cross-correlation function. The main results of our study are as follows: ( 1) The cross-correlation function xi(ga) measured using only emission-line - dominated galaxies and Ly alpha absorbers with log N(H I) >= 14 shows a comparable strength to the galaxy autocorrelation function xi(gg) on comoving, projected distance scales of less than 1 h(-1) Mpc, while there remains a lack of cross-correlation signal when using only absorption-line - dominated galaxies. This signifies a morphology-dependent xi(ga) and indicates that strong absorbers with log N( H I) >= 14 and emission-line galaxies reside in the same halo population. (2) A maximum likelihood analysis shows that Ly alpha absorbers with log N(H I) < 13.6 are consistent with being more randomly distributed with respect to known galaxies. ( 3) Finally, we find based on this single sight line that the amplitude of xi(ga) does not depend sensitively on N( H I) for strong absorbers, with log N( H I) >= 13.6.
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