other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2011MNRAS.413.2665F - Mon. Not. R. Astron. Soc., 413, 2665-2678 (2011/June-1)
Bridging the gap between low- and high-mass dwarf galaxies.
FORBES D.A., SPITLER L.R., GRAHAM A.W., FOSTER C., HAU G.K.T. and BENSON A.
Abstract (from CDS):
With long exposures on the Keck telescope using the Echelle Spectrograph and Imager instrument, we have succeeded in bridging this gap by measuring the dynamical mass for five dwarf galaxies with MK ∼ -17.5 (MB ∼ -15.5). With the exception of our brightest dwarf galaxy, they possess relatively flat velocity dispersion profiles of around 20 km/s. By examining their 2D scaling relations and 3D fundamental manifold, we found that the sizes and velocity dispersions of these gap galaxies reveal continuous trends from dE to dSph galaxies. We conclude that low-luminosity dE galaxies are dominated by stars, not by dark matter, within their half light radii. This finding can be understood if internal feedback processes are operating most efficiently in gap galaxies, gravitationally heating the centrally located dark matter to larger radii, whereas external environmental processes, which can strip away stars, have a greater influence on dSph galaxies, resulting in their higher dark matter fractions. UCD objects appear to be more similar to massive compact star clusters than to small galaxies. Our dynamical study of low-mass dE galaxies provides further constraints on the processes that shape some of the smallest and most-numerous galaxies in the Universe. Modelling circumbinary gas flows in close T Tauri binaries
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: kinematics and dynamics - galaxies: star clusters: general
Simbad objects: 24
To bookmark this query, right click on this link: simbad:2011MNRAS.413.2665F and select 'bookmark this link' or equivalent in the popup menu