Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-02-16
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
21 pages, 16 figures, 2 tables, 1 ancillary file, accepted for publication in ApJ
Scientific paper
We show the radial dependence of stellar baryon fraction curves derived for 21 lensing galaxies from the CfA-Arizona Space Telescope LEns Survey by means of stellar population synthesis and pixel-based mass reconstruction. The sample covers a stellar mass range of Ms~2x10^9-3x10^11 Msol (solar masses) which corresponds to a total mass range of ML~7x10^9-3x10^12 Msol on scales from 0.25 to 5 Re (effective radii). By examining the Ms-to-ML dependence on radial distance to the center of each galaxy we find pairs of lenses on small to intermediate mass scales which approach at large radii the same values for their enclosed total mass but exhibit very different stellar masses and stellar baryon fractions. This behaviour subsides for the most massive lenses. All baryon fraction profiles show that the dark matter halo overtakes the stellar content between 1.5 and 2.5 Re. We find evidence for a stellar baryon fraction steadily declining over the full mass range. We shed light on the Fundamental Plane puzzle by showing that the slope of the ML(
Falco Emilio E.
Ferreras Ignacio
Leier Dominik
Saha Prasenjit
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