SIMBAD references

2008A&A...484..159N - Astronomy and Astrophysics, volume 484, 159-172 (2008/6-2)

IMAGES. II. A surprisingly low fraction of undisturbed rotating spiral disks at z ∼ 0.6 The morpho-kinematical relation 6 Gyr ago.

NEICHEL B., HAMMER F., PUECH M., FLORES H., LEHNERT M., RAWAT A., YANG Y., DELGADO R., AMRAM P., BALKOWSKI C., CESARSKY C., DANNERBAUER H., FUENTES-CARRERA I., GUIDERDONI B., KEMBHAVI A., LIANG Y.C., NESVADBA N., OESTLIN G., POZZETTI L., RAVIKUMAR C.D., DI SEREGO ALIGHIERI S., VERGANI D., VERNET J. and WOZNIAK H.

Abstract (from CDS):

We present a first combined analysis of the morphological and dynamical properties for the intermediate-mass Galaxy Evolution Sequence (IMAGES) sample. It is a representative sample of 52 z∼0.6 galaxies with Mstell from 1.5 to 15x1010M that possesses 3D resolved kinematics and HST deep imaging in at least two broad band filters. We aim at evaluating the evolution of rotating spirals robustly since z∼0.6, as well as at testing the different schemes for classifying galaxies morphologically. We used all the information provided by multi-band images, color maps, and 2D light fitting to assign a morphological class to each object. We divided our sample into spiral disks, peculiar objects, compact objects, and mergers. Using our morphological classification scheme, 4/5 of the identified spirals are rotating disks, and more than 4/5 of identified peculiar galaxies show complex kinematics, while automatic classification methods such as concentration-asymmetry and GINI-M20 severely overestimate the fraction of relaxed disk galaxies. Using this methodology, we find that the fraction of undisturbed rotating spirals has increased by a factor ∼2 during the past 6Gyr, a much higher fraction than was found previously based on morphologies alone. These rotating spiral disks are forming stars very rapidly, even doubling their stellar masses over the past 6Gyr, while most of their stars were formed a few Gyr earlier, which reveals a large gas supply. Because they are the likely progenitors of local spirals, we can conjecture how their properties are evolving. Their disks show some evidence of inside-out growth, and the gas supply/accretion is not random since the disk needs to be stable in order to match the local disk properties.

Abstract Copyright:

Journal keyword(s): galaxies: formation - galaxies: evolution - galaxies: kinematics and dynamics - galaxies: fundametal parameters

CDS comments: Fig.1 J033237.54-274848.9 is a probable misprint for GOODS J033237.54-274838.9

Simbad objects: 55

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2008A&A...484..159N and select 'bookmark this link' or equivalent in the popup menu


2021.05.11-23:24:53

© Université de Strasbourg/CNRS

    • Contact