96 citations · 266 across the 8 of their papers we have counts for
5 papers · 1 filter
Metal Lines in Cosmological Models of Lyman-Alpha Absorbers
Uffe Hellsten, Lars Hernquist, Neal Katz +1
The metal absorption lines found in association with \lya absorbers of moderate to high HI column density contain valuable information about the metallicity and ionization conditio…
On the Minimum Metallicity and Mass of the Population II Stars
Uffe Hellsten, D. N. C. Lin
Within collapsing protogalaxies, thermal instability leads to the formation of a population of cool fragments which are confined by the pressure of a residual hot background medium…
The Observability of Metal Lines Associated with the Lyman-alpha Forest
Uffe Hellsten, Lars Hernquist, Neal Katz +1
We develop a prescription for characterizing the strengths of metal lines associated with Lyman-alpha forest absorbers (LYFAs) of a given neutral hydrogen column density N_HI and m…
On the Global Structure of Self-gravitating Disks for Softened Gravity
Jesper Sommer-Larsen, Henrik Vedel, Uffe Hellsten
Effects of gravitational softening on the global structure of self-gravitating disks in centrifugal equillibrium are examined in relation to hydrodynamical/gravitational simulation…
Metal Lines Associated with Lyman Alpha Absorbers: A Comparison of Theory and Observations
Uffe Hellsten, Romeel Dave, Lars Hernquist +2
We study metal line absorption of CIV, CII, SiIV, and NV at redshifts z=3.5 to z=2 within the framework of a cosmological model for the Lyman alpha forest, comparing the results of…