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CIV Absorption From Galaxies in the Process of Formation
Martin Haehnelt, Matthias Steinmetz, Michael Rauch
We investigate the heavy element QSO absorption systems caused by gas condensations at high redshift which evolve into galaxies with circular velocity of 100 to 200 km/s at the pre…
Warm Gas at High Redshift - Clues to Gravitational Structure Formation from Optical Spectroscopy of Lyman Alpha Absorption Systems
Michael Rauch
We discuss the effects of gravitational collapse on the shape of absorption line profiles for low column density (log N(HI) < 14) Lyman Alpha forest clouds and argue by comparison…
The Lyman Alpha Forest from Gravitational Collapse in the CDM+Lambda Model
Jordi Miralda-Escude, Renyue Cen, Jeremiah P. Ostriker +1
We model the $\lya$ forest in a spatially flat, CDM model with , with an Eulerian hydrodynamic simulation, and find that the intergalactic, photoionized gas collapses into s…
The metal line systems in HS1700+6416: Evidence for inhomogeneities
Patrick Petitjean, Ruediger Riediger, Michael Rauch
We present a high S/N ratio optical spectrum of the bright quasar HS1700+6416. These data usefully complement the UV HST data from Vogel and Reimers (1995). We analyse the metal li…
The Distribution of Column Densities and b Values in the Lyman-Alpha Forest
Esther M. Hu, Tae-Sun Kim, Lennox L. Cowie +2
We describe the properties of the Ly forest in the column density range $\nhi \geq 2\times10^{12}$ cm based on 1056 lines in the wavelength range 4300--5100Åmeasured in e…