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The Small Covering Factor of Cold Accretion Streams
C. -A. Faucher-Giguere, D. Keres
Theoretical models of galaxy formation predict that galaxies acquire most of their baryons via cold mode accretion. Observations of high-redshift galaxies, while showing ubiquitous…
Do sub-millimeter galaxy number counts provide evidence for a top-heavy IMF?
Christopher C. Hayward, Desika Narayanan, Patrik Jonsson +4
Theoretical models have had difficulty matching the observed number density of sub-millimeter galaxies (SMGs), causing some authors (e.g., Baugh et al. 2005) to suggest that SMGs p…
Simulations of the Magellanic Stream in a First Infall Scenario
Gurtina Besla, Nitya Kallivayalil, Lars Hernquist +3
Recent high precision proper motions from the Hubble Space Telescope (HST) suggest that the Large and Small Magellanic Clouds (LMC and SMC, respectively) are either on their first…
Intergalactic Dust Extinction in Hydrodynamic Cosmological Simulations
Ying Zu, David H. Weinberg, Romeel Davé +4
Recently Menard et al. detected a subtle but systematic change in the mean color of quasars as a function of their projected separation from foreground galaxies, extending to comov…
Lyman-alpha Cooling Emission from Galaxy Formation
C. -A. Faucher-Giguere, D. Keres, M. Dijkstra +2
Recent studies have shown that galaxies accrete most of their baryons via the cold mode, from streams with temperatures T~10^4-10^5 K. At these temperatures, the streams should rad…
Mergers in Lambda-CDM: Uncertainties in Theoretical Predictions and Interpretations of the Merger Rate
Philip F. Hopkins, Darren Croton, Kevin Bundy +10
Different methodologies lead to order-of-magnitude variations in predicted galaxy merger rates. We examine and quantify the dominant uncertainties. Different halo merger rates and…