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Spontaneous and stimulated star formation in galaxies: Ultraviolet limits on star formation thresholds and optical constraints on Lambda-CDM cosmological simulations of galaxy formation

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Madore, B. F. and Boissier, S. and Gil de Paz, Armando and Nelson, E. and Petrillo, K. (2007) Spontaneous and stimulated star formation in galaxies: Ultraviolet limits on star formation thresholds and optical constraints on Lambda-CDM cosmological simulations of galaxy formation. In From stars to galaxies: building the pieces to build up the universe. ASP Conference Series (374). Astronomical Society of the Pacific, pp. 455-462. ISBN 978-1-58381-309-6

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Abstract

We present recent results from several on-going studies: The first addresses the question of gas-density thresholds for star formation, as probed by the outer disks of normal nearby galaxies. The second concerns the observational evidence for the existence of gravitating non-luminous (GNL) galaxies, as predicted by most recent simulations of galaxy formation in Lambda-CDM cosmologies. We find that (1) If star formation is traced by far-ultraviolet light, then there is no evidence for a threshold to star formation at any gas density so far probed, and (2) there is no evidence for GNL galaxies gravitationally interacting with known optical systems based on the observations (a) that there are no ring galaxies without plausible optically visible intruders, (b) all peculiar galaxies in the Arp Atlas that are bodily distorted have nearby plausibly interacting companions, and (c) there are no convincingly distorted/peculiar galaxies within Karachentsev's sample of more than 1,000 apparently/optically isolated galaxies.


Item Type:Book Section
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© Astronomical Society of the Pacific.
International Conference From Stars to Galaxies - Building the Pieces to Build up the Universe held in honor of Cesare Chiosis 65th Birthday (2006. Venice, Italy). We sincerely thank all of our colleagues on the GALEX Mission for their support in enabling the science being conducted by NASA’s Galaxy Evolution Explorer. Major portions of this research would not have been possible without the NASA/IPAC Extragalactic database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Significant support for this research was also provided by the Observatories of the Carnegie Institution of Washington.

Uncontrolled Keywords:Disk
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:35881
Deposited On:23 Feb 2016 16:30
Last Modified:10 Dec 2018 15:05

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