The Coherence Length of Lyman-Alpha Absorbers at z ~ 1

Details The Coherence Length of Lyman-Alpha Absorbers at z ~ 1 The Coherence Length of Lyman-Alpha Absorbers at z ~ 1

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8266i&link_type=abstract

HST Proposal ID #8266

Physics

Hst Proposal Id #8266 Quasar Absorption Lines

Scientific paper

We propose to use STIS spectroscopy to measure the coherence length of Lyman-Alpha absorbers in the redshift range 0.5 < z < 1.1, using a new pair of quasars with a separation of 130 arcseconds. Quasars with this brightness {R = 18.1}, redshift and separation are very rare. Coincident absorbers along the line-of-sight to quasar pairs can reveal the geometry of the diffuse but highly ionized gas that makes up the Lyman-Alpha forest; this gas represents the majority of the baryons and it traces the underlying dark matter distribution. The simple physical history of these low density regions of the universe means that HST quasar spectra can be used to derive the shape and amplitude of the power spectrum of mass fluctuations. We will use automated line selection and fitting software to identically measure the HST spectra and spectra extracted from SPH supercomputer simulations. The goals are to {a} make an improved measurement of the coherence length of Lyman-Alpha absorbers at z 1, {b} determine whether or not the coherence length is a function of line strength or column density, {c} look for evolution as a function of column density across the range 0.5 < z < 1.1, and {d} make a direct comparison between the absorber properties and the predictions of supercomputer simulations on scales of 0.5 h_100^-1 Mpc.

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