Stellar Disk Truncations: HI Density and Dynamics

Details Stellar Disk Truncations: HI Density and Dynamics Stellar Disk Truncations: HI Density and Dynamics

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1240..263t&link_type=abstract

HUNTING FOR THE DARK: THE HIDDEN SIDE OF GALAXY FORMATION. Edited by Victor P. Debattista and Cristina C. Popescu AIP Conferen

Mathematics

Logic

1

Spiral Galaxies, Star Formation, Cosmology, Stellar Size, Spiral Galaxies, Star Formation, Observational Cosmology, Stellar Content And Populations, Radii, Morphology And Overall Structure

Scientific paper

Using HI Nearby Galaxy Survey (THINGS) 21-cm observations of a sample of nearby (nearly face-on) galaxies we explore whether the stellar disk truncation phenomenon produces any signature either in the HI gas density and/or in the gas dynamics. Recent cosmological simulations suggest that the origin of the break on the surface brightness distribution is produced by the appearance of a warp at the truncation position. This warp should produce a flaring on the gas distribution increasing the velocity dispersion of the HI component beyond the break. We do not find, however, any evidence of this increase in the gas velocity dispersion profile.

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