Determining the Statistical Properties of the Local Ly-alpha Forest

Details Determining the Statistical Properties of the Local Ly-alpha Forest Determining the Statistical Properties of the Local Ly-alpha Forest

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9221s&link_type=abstract

HST Proposal ID #9221

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Hst Proposal Id #9221 Quasar Absorption Lines And Igm

Scientific paper

We propose an archival study of the seven available {or soon to be} STIS E140M spectra of bright AGN that can be used to characterize the statistical nature of the local Ly-alpha forest. In conjunction with two of our own spectra, these 10 km s^-1 resolution spectra will probe a pathlength through the local Universe {z<=q0.3} of Delta z 1.6, which will allow us to improve significantly the column density and b-value distributions, as well as the two-point correlation function and absorber metallicities. These results will be compared with similar data in-hand at z=1.0-1.5 from HST and at higher z from Keck spectra. The primary science driver for this work is to determine more accurately the baryon content of the local intergalactic medium {IGM} as well as its physical conditions {e.g., ``effective equation of state''} and metallicity as a function of distance from the nearest galaxy. Our team is experienced in reducing and analyzing these data and have used our own medium resolution { 20 km s^-1}, first- order grating GHRS and STIS spectra {Penton et al. 2000a, b} to obtain the first detailed assessment of the baryon content, b- value distribution, clustering and metallicity of the local Ly-alpha forest. This proposed archival study will improve significantly on all aspects of the current results from our group and others.

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