The Ly-alpha Forest toward PKS 0405-123

Details The Ly-alpha Forest toward PKS 0405-123 The Ly-alpha Forest toward PKS 0405-123

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281..265w&link_type=abstract

The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb

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We present results from ~7 km/s resolution STIS spectra for the bright, low-z QSO PKS 0405-123 (z = 0.574, V = 14.9), as part of a STIS Investigation Definition Team (IDT) key project to determine the physical properties of weak Ly-alpha forest systems at low redshift. We detect 59 (47) Ly-alpha absorbers at 4.0 sigma significance to an 80% completeness limit of log (NHI)=13.3 (13.1) over 0.002 < z < 0.423 (0.020 < z < 0.234). We find 4 intervening OVI systems, which will be useful in studies of hot intergalactic gas. We do not distinguish between metal and Ly-alpha-only systems in the following analysis.
The redshift density is consistent with previous measurements for log NHI >= 14.0, but exhibits twice as many systems at 13.1 < log NHI < 14.0 compared to the mean number density of lines at z < 0.07 toward 15 extragalactic objects. The difference possibly arises from cosmic variance. The Doppler parameter distribution has = 48 +/- 21 km/s; line blending possibly inflates the value. We find evidence for Ly-alpha-Ly-alpha clustering in our sample on a scale of dv <= 250 km/s , and there is evidence for a void in the Ly-alpha forest at 0.032 < z < 0.081 with probability of occurrance in random simulations P=0.0005. We find line-of-sight velocity correlations of up to 250 km/s between Ly-alpha absorbers with log(NHI) >= 13.1 and 45 galaxies taken from the literature and unpublished data at 0 < z < 0.47; the transverse distances cover up to 1.5 h-170 Mpc in the local frame. The Ly-alpha-galaxy clustering is stronger for higher log(NHI) systems.

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