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Modeling Tidal Streams in evolving dark matter halos
Jorge Penarrubia, Andrew J. Benson, David Martinez-Delgado +1
We explore whether stellar tidal streams can provide information on the secular, cosmological evolution of the Milky Way's gravitational potential and on the presence of subhalos.…
Studying distant dwarf galaxies with GEMS and SDSS
Fabio D. Barazza, Shardha Jogee, Hans-Walter Rix +7
We study the colors, structural properties, and star formation histories of a sample of ~1600 dwarfs over look-back times of ~3 Gyr (z=0.002-0.25). The sample consists of 401 dista…
Detecting Faint Galaxies by Stacking at 24 micron
X. Z. Zheng, E. F. Bell, H. -W. Rix +4
We stack Spitzer 24 micron images for ~7000 galaxies with 0.1<z<1 in the Chandra Deep Field South to probe the thermal dust emission in low-luminosity galaxies over this redshift r…
The Evolution of Rest-Frame K-band Properties of Early-Type Galaxies from z=1 to the Present
A. van der Wel, M. Franx, P. G. van Dokkum +3
We measure the evolution of the rest-frame K-band Fundamental Plane from z=1 to the present by using IRAC imaging of a sample of early-type galaxies in the Chandra Deep Field-South…
Spectroscopic Redshifts for Seven Lens Galaxies
Eran O. Ofek, Dan Maoz, Hans-Walter Rix +2
We report VLT observations of 11 lensed quasars, designed to measure the redshifts of their lens galaxies. We successfully determined the redshifts for seven systems, five of which…
A Search for PNe in Nearby Galaxies with SDSS Imaging Data
Alexei Y. Kniazev, Eva K. Grebel, Daniel B. Zucker +4
We present the latest results from our project to search for new planetary nebulae in nearby galaxies using Sloan Digital Sky Survey (SDSS) imaging data. Our method is based on pho…