The column density distribution of the Lyman-alpha forest: A measure of small scale power

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Absorption lines in the Ly{alpha} forest can be thought of as peaks in neutral hydrogen density along lines of sight. The column density distribution (the number density of absorption lines as a function of column density) is then a statistic of density peaks, which contains information about the underlying power spectrum. In particular, we show that the slope of the distribution provides a measure of power on scales smaller than those probed by studies of present day large scale structure. 2 refs., 1 fig.

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5 p.

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Hui, Lam; Gnedin, Nickolay Y. & Zhang, Yu February 19, 1997.

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  • Hui, Lam Fermi National Accelerator Lab., Batavia, IL (United States)
  • Gnedin, Nickolay Y. Astronomy Dept., California Univ., Berkeley, CA (United States)
  • Zhang, Yu Illinois Univ., Urbana, IL (United States)

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Description

Absorption lines in the Ly{alpha} forest can be thought of as peaks in neutral hydrogen density along lines of sight. The column density distribution (the number density of absorption lines as a function of column density) is then a statistic of density peaks, which contains information about the underlying power spectrum. In particular, we show that the slope of the distribution provides a measure of power on scales smaller than those probed by studies of present day large scale structure. 2 refs., 1 fig.

Physical Description

5 p.

Notes

OSTI as DE97052000

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  • 18. Texas symposium on relativistic astrophysics, No City Given, TX (United States), Dec 1996

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  • Other: DE97052000
  • Report No.: FNAL/C--97/028-A
  • Report No.: CONF-961266--1
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/481834 | External Link
  • Office of Scientific & Technical Information Report Number: 481834
  • Archival Resource Key: ark:/67531/metadc676179

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  • February 19, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • April 1, 2016, 3:45 p.m.

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Hui, Lam; Gnedin, Nickolay Y. & Zhang, Yu. The column density distribution of the Lyman-alpha forest: A measure of small scale power, report, February 19, 1997; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc676179/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.