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Full-Text Articles in Astrophysics and Astronomy
Mapping The Dark Matter From Uv Light At High Redshift: An Empirical Approach To Understand Galaxy Statistics, Kyoung-Soo Lee, Mauro Giavalisco, Charlie Conroy, Risa H. Wechsler, Henry C. Ferguson, Rachel S. Somerville, Mark E. Dickinson, Claudia M. Urry
Mapping The Dark Matter From Uv Light At High Redshift: An Empirical Approach To Understand Galaxy Statistics, Kyoung-Soo Lee, Mauro Giavalisco, Charlie Conroy, Risa H. Wechsler, Henry C. Ferguson, Rachel S. Somerville, Mark E. Dickinson, Claudia M. Urry
Astronomy Department Faculty Publication Series
We present a simple formalism to interpret the observations of two galaxy statistics, the UV luminosity function (LF) and two-point correlation functions for star-forming galaxies at z∼4, 5, and 6 in the context of Λ cold dark matter cosmology. Both statistics are the result of how star formation takes place in dark matter halos, and thus are used to constrain how UV light depends on halo properties, in particular halo mass. The two physical quantities we explore are the star formation duty cycle, and the range of UV luminosity that a halo of mass M can have (mean and …
The Nature Of Red Dwarf Galaxies, Y Wang, Xh Yang, Hj Mo, Fc Van Den Bosch, N Katz, A Pasquali, Dh Mcintosh, Sm Weinmann
The Nature Of Red Dwarf Galaxies, Y Wang, Xh Yang, Hj Mo, Fc Van Den Bosch, N Katz, A Pasquali, Dh Mcintosh, Sm Weinmann
Astronomy Department Faculty Publication Series
Using dark matter halos traced by galaxy groups selected from the Sloan Digital Sky Survey Data Release 4, we find that about 1/4 of the faint galaxies (0.1 Mr – 5log h> – 17.05, hereafter dwarfs) that are the central galaxies in their own halo are not blue and star forming, as expected in standard models of galaxy formation, but are red. In contrast, this fraction is about 1/2 for dwarf satellite galaxies. Many red dwarf galaxies are physically associated with more massive halos. In total, about ~45% of red dwarf galaxies reside in massive halos as satellites, …