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The Cosmological Significance Of High-Velocity Cloud Complex H, Jd Simon, L Blitz, Aa Cole, Md Weinberg, M Cohen
The Cosmological Significance Of High-Velocity Cloud Complex H, Jd Simon, L Blitz, Aa Cole, Md Weinberg, M Cohen
Astronomy Department Faculty Publication Series
We have used new and archival infrared and radio observations to search for a dwarf galaxy associated with the high-velocity cloud (HVC) known as `complex H.' Complex H is a large (Ω gtrsim 400 deg2) and probably nearby (d = 27 kpc) HVC whose location in the Galactic plane has hampered previous investigations of its stellar content. The H I mass of the cloud is 2.0 × 107(d/27 kpc)2 Msun, making complex H one of the most massive HVCs if its distance is more than ~20 kpc. Virtually all similar H I clouds in other galaxy groups are associated with …
Star Formation And Feedback In Smoothed Particle Hydrodynamic Simulations - I. Isolated Galaxies, G Stinson, A Seth, N Katz, J Wadsley, F Governato, T Quinn
Star Formation And Feedback In Smoothed Particle Hydrodynamic Simulations - I. Isolated Galaxies, G Stinson, A Seth, N Katz, J Wadsley, F Governato, T Quinn
Astronomy Department Faculty Publication Series
We present an analysis of star formation and feedback recipes appropriate for galactic smoothed particle hydrodynamics simulations. Using an isolated Milky Way-like galaxy, we constrain these recipes based on well-established observational results. Our star formation recipe is based on that of Katz with the additional inclusion of physically motivated supernova feedback recipes. We propose a new feedback recipe in which Type II supernovae are modelled using an analytical treatment of blastwaves. With this feedback mechanism and a tuning of other star formation parameters, the star formation in our isolated Milky Way-like galaxy follows the slope and normalization of the observed …