The elaboration of spiral galaxies: morpho-kinematics analyses of their progenitors with IMAGES - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




The elaboration of spiral galaxies: morpho-kinematics analyses of their progenitors with IMAGES - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The IMAGES project aims at measuring the velocity fields of a representativesample of 100 massive galaxies at z=0.4-0.75, selected in the CDFS, the CFRSand the HDFS fields. It uses the world-unique mode of multiple integral fieldunits of FLAMES- GIRAFFE at VLT. The resolved-kinematics data allow us tosample the large scale motions at ~ few kpc scale for each galaxy. They havebeen combined with the deepest HST-ACS, Spitzer MIPS and IRAC and VLT-FORS2ever achieved observations. Most intermediate redshift galaxies show anomalousvelocity fields: 6 Gyrs ago, half of the present day spirals were out ofequilibrium and had peculiar morphologies. The wealth of the data in thesefields allow us to modelize the physical processes in each galaxy with anaccuracy almost similar to what is done in the local Universe. These detailedanalyses reveal the importance of merger processes, including their remnantphases. Together with the large evolution of spiral properties, this points outthe importance of disk survival and strengthens the disk rebuilding scenario.This suggests that the hierarchical scenario may apply to the elaboration ofdisk galaxies as it does for ellipticals.



Author: F. Hammer GEPI, Observatoire de Paris Meudon, for the IMAGES Collaboration

Source: https://arxiv.org/







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