2 Leo Blitz And
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GLOBAL STAR FORMATION FROM z = 5 × 10 −8 to z = 20 LEO
Starting with the assertion that the problem of isolated, single star formation is essentially solved, this paper examines some of the missing steps needed to go from there to understanding the star formation history of the Universe. Along the way, some results on the formation of star clusters in the Milky Way and the properties of GMCs in nearby galaxies are briefly examined.
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We suggest that the high–velocity clouds (HVCs) are large clouds, with typical diameters of 25 kpc and containing 5×107 solar masses of neutral gas and 3×108 solar masses of dark matter, falling onto the Local Group; altogether the HVCs contain 10 solar masses of neutral gas. Our reexamination of the Local–Group hypothesis for the HVCs connects their properties to the hierarchical structure for...
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S OF THE TALKS ..................................................... 6 ABSTRACTS OF THE BLITZ PRESENTATIONS .............. 20S OF THE BLITZ PRESENTATIONS .............. 20 ABSTRACTS OF THE POSTER PRESENTATIONS ......... 35S OF THE POSTER PRESENTATIONS ......... 35 Space, Memory and Evolution – The Comparative View on the Hippocampus
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We examine the hypothesis that hydrostatic pressure alone determines the ratio of atomic to molecular gas averaged over a particular radius in disk galaxies. The hypothesis implies that the transition radius, the location where the ratio is unity, should always occur at the same value of stellar surface density in all galaxies. We examine data for 28 galaxies and find that the stellar surface d...
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The evidence for locating the High Velocity Clouds in the Local Group is summarized and evaluated. Recent measurements of the Hα surface brightness and metallicity of a number of HVCs appear to be fatal to the Galactic fountain as a significant contributor to the HVC phenomenon, but not to the existence of the fountain itself. Observations of extragalactic analogues to HVCs remain the sine qua ...
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تاریخ انتشار 1999