Large-Scale Structure at High Redshift

Details Large-Scale Structure at High Redshift Large-Scale Structure at High Redshift

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet.1651c&link_type=abstract

The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF), Rio

Physics

Scientific paper

Quasar absorption lines can be used to map out the structure of the Universe up to at least redshift 6. The Lyman-alpha forest due to neutral hydrogen in the intergalactic medium is particularly useful as a tracer, being simply related to the distribution of the dark matter in current theories. I outline how this probe of structure can be used to measure the clustering of matter, and constrain cosmology. I also show how fluctuations in the large scale photoionizing radiation field can leave an imprint, and how structure in the intergalactic medium is related to that of galaxies. With the advent of huge new datasets such as that from the Sloan Digital Sky Survey (which contains over 100 times more quasar spectra than prior surveys), there are many opportunities for precision cosmological tests using quasar absorption lines. In particular, these data allow us to examine the radiation field close to quasars themselves. The finite light travel time allows us put stringent limits on the quasar episodic lifetime tq < 2 × 106 y.

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