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Date and Time of the Query: 2019-05-24 T19:03:48 PDT
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For refcode 2007AJ....134.1849W:
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2007AJ....134.1849W The Minimum Amount of Stars a Galaxy Will Form Bradley E. Warren, Helmut Jerjen, and Baerbel S. Koribalski Abstract. We present an analysis of the atomic hydrogen and stellar properties of 38 late-type galaxies in the local universe covering a wide range of H I mass-to-light ratios (M_HI_/L_B_), stellar luminosities, and surface brightnesses. Combining the results with those of four other well-studied dwarf galaxies known for their unusually large H I contents, we identified an upper envelope for the M_HI_/L_B_ as a function of galaxy luminosity. This implies an empirical relation between the minimum amount of stars a galaxy will form and its initial baryonic mass. We also find that the star density systematically decreases with increasing M_HI_/L_B_, making the galaxies optically more elusive. While the stellar mass of a galaxy seems to be only loosely connected to its baryonic mass, the latter quantity is strongly linked to the galaxy's dynamical mass as it is observed in the baryonic Tully-Fisher relation. We find that dwarf irregular galaxies with generally high M_Hi_/L_B_ ratios follow the same trend as defined by lower M_HI_/L_B_ giant galaxies but are underluminous for their rotation velocity to follow the trend in a stellar mass Tully-Fisher relation, suggesting that the baryonic mass of the dwarf galaxies is normal but they have failed to produce a sufficient amount of stars. Finally, we present a three-dimensional equivalent to the morphology-density relation which shows that high M_HI_/L_B_ galaxies preferentially evolve and/or survive in low-density environments. We conclude that an isolated galaxy with a shallow dark matter potential can retain a large portion of its baryonic matter in the form of gas, only producing the minimum quantity of stars necessary to maintain a stable gas disk. Key words: Galaxies: Dwarf, Galaxies: Evolution, Galaxies: Individual: ESO 215-G?009, Galaxies: ISM, Galaxies: Kinematics and Dynamics, Galaxies: Photometry
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