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Dissecting the star-formation history of starburst galaxies: the case of NGC7673
A. Pasquali, P. Castangia
We have collected archival data on NGC7673 to constrain the star-formation history that produced the young star clusters and the field stellar population in this galaxy during the…
Towards a Solution for the Ca II Triplet Puzzle : Results from Dwarf Elliptical Galaxies
Dolf Michielsen, Mina Koleva, Philippe Prugniel +6
We present new estimates of ages and metallicities, based on FORS/VLT optical (4400-5500A) spectroscopy, of 16 dwarf elliptical galaxies (dE's) in the Fornax Cluster and in Souther…
The Importance of Satellite Quenching for the Build-Up of the Red Sequence of Present Day Galaxies
Frank C. van den Bosch, Daniel Aquino, Xiaohu Yang +5
In the current paradigm, red sequence galaxies are believed to have formed as blue disk galaxies that subsequently had their star formation quenched. Since red-sequence galaxies ty…
The Stellar Mass Distribution in the Giant Star Forming Region NGC 346
E. Sabbi, M. Sirianni, A. Nota +8
Deep F555W and F814W Hubble Space Telescope ACS images are the basis for a study of the present day mass function (PDMF) of NGC346, the largest active star forming region in the Sm…
Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
Xiaohu Yang, H. J. Mo, Frank C. van den Bosch +3
We use a modified version of the halo-based group finder developed by Yang et al. to select galaxy groups from the Sloan Digital Sky Survey (SDSS DR4). In the first step, a combina…
Spatial and kinematic alignments between central and satellite halos
A. Faltenbacher, Y. P. Jing, Cheng Li +4
Based on a cosmological N-body simulation we analyze spatial and kinematic alignments of satellite halos within six times the virial radius of group size host halos (Rvir). We meas…