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Full-Text Articles in Physical Sciences and Mathematics
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 …
A Two Micron All Sky Survey View Of The Sagittarius Dwarf Galaxy. Ii. Swope Telescope Spectroscopy Of M Giant Stars In The Dynamically Cold Sagittarius Tidal Stream, Sr Majewski, We Kunkel, Dr Law, Rj Patterson, Aa Polak, Hj Rocha-Pinto, Jd Crane, Pm Frinchaboy, Cb Hummels, Kv Johnston, J Rhee, Mf Skrutskie, M Weinberg
A Two Micron All Sky Survey View Of The Sagittarius Dwarf Galaxy. Ii. Swope Telescope Spectroscopy Of M Giant Stars In The Dynamically Cold Sagittarius Tidal Stream, Sr Majewski, We Kunkel, Dr Law, Rj Patterson, Aa Polak, Hj Rocha-Pinto, Jd Crane, Pm Frinchaboy, Cb Hummels, Kv Johnston, J Rhee, Mf Skrutskie, M Weinberg
Astronomy Department Faculty Publication Series
We have obtained moderate resolution (~6 km s-1) spectroscopy of several hundred M giant candidates selected from Two Micron All Sky Survey photometry. Radial velocities are presented for stars mainly in the southern Galactic hemisphere, and the primary targets have Galactic positions consistent with association to the tidal tail system of the Sagittarius (Sgr) dwarf galaxy. M giant stars selected from the apparent trailing debris arm of Sgr have velocities showing a clear trend with orbital longitude, as expected from models of the orbit and destruction of Sgr. A minimum 8 kpc width of the trailing stream about the Sgr …