Morphological evolution in situ: Disk-dominated cluster red sequences at z ~ 1.25
arXiv:1503.07166 · doi:10.1093/mnras/stv649
Abstract
We have carried out a joint photometric and structural analysis of red sequence galaxies in four clusters at a mean redshift of z ~ 1.25 using optical and near-IR HST imaging reaching to at least 3 magnitudes fainter than . As expected, the photometry and overall galaxy sizes imply purely passive evolution of stellar populations in red sequence cluster galaxies. However, the morphologies of red sequence cluster galaxies at these redshifts show significant differences to those of local counterparts. Apart from the most massive galaxies, the high redshift red sequence galaxies are significantly diskier than their low redshift analogues. These galaxies also show significant colour gradients, again not present in their low redshift equivalents, most straightforwardly explained by radial age gradients. A clear implication of these findings is that red sequence cluster galaxies originally arrive on the sequence as disk-dominated galaxies whose disks subsequently fade or evolve secularly to end up as high Sérsic index early-type galaxies (classical S0s or possibly ellipticals) at lower redshift. The apparent lack of growth seen in a comparison of high and low redshift red sequence galaxies implies that any evolution is internal and is unlikely to involve significant mergers. While significant star formation may have ended at high redshift, the cluster red sequence population continues to evolve (morphologically) for several Gyrs thereafter.
Accepted by MNRAS
References in corpus (24)
- The SAURON project -- IX. A kinematic classification for early-type galaxies
- Galaxy Zoo: the dependence of morphology and colour on environment
- The build-up of the colour-magnitude relation in galaxy clusters since z~0.8
- The STAGES view of red spirals and dusty red galaxies: Mass-dependent quenching of star-formation in cluster infall
- Evolution of the Color-Magnitude Relation in Galaxy Clusters at z ~1 from the ACS Intermediate Redshift Cluster Survey
- The Kormendy relation of massive elliptical galaxies at z~1.5. Evidence for size evolution ?
- Evolution of the Color-Magnitude relation in High-Redshift Clusters: Early-type Galaxies in the Lynx Supercluster at z~1.26
- The Formation of Massive Cluster Galaxies
- The Gemini Deep Deep Survey: VIII. When Did Early-type Galaxies Form?
- The history of mass assembly of faint red galaxies in 28 galaxy clusters since z=1.3
- The Galaxy Cluster Mid-Infrared Luminosity Function at 1.3<z<3.2
- Stellar populations and evolution of early-type cluster galaxies: Constraints from optical imaging and spectroscopy of z=0.5-0.9 galaxy clusters
- The Evolution of Dusty Star Formation and Stellar Mass Assembly in Clusters: Results from the IRAC 3.6um, 4.5um, 5.8um and 8.0um Cluster Luminosity Functions
- The Luminosity Function of Low-Redshift Abell Galaxy Clusters
- Assembly of the Red Sequence in Infrared-Selected Galaxy Clusters from the IRAC Shallow Cluster Survey
- From blue star-forming to red passive: galaxies in transition in different environments
- The Red Sequence Luminosity Function in Massive Intermediate Redshift Galaxy Clusters
- The environmental impacts on the star formation main sequence: an H-alpha study of the newly discovered rich cluster at z=1.52
- Galaxy population properties of the massive X-ray luminous galaxy cluster XDCP J0044.0-2033 at z=1.58: red-sequence formation, massive galaxy assembly, and central star formation activity
- The buildup of stellar mass and the 3.6 micron luminosity function in clusters from z=1.25 to z=0.2
- Shape Evolution of Massive Early-Type Galaxies: Confirmation of Increased Disk Prevalence at z>1
- The evolution of the cluster optical galaxy luminosity function between z=0.4 and 0.9 in the DAFT/FADA survey
- RXJ0848.6+4453: The Evolution of Galaxy Sizes and Stellar Populations in a z=1.27 Cluster
- A tale of a rich cluster at z0.8 as seen by the Star Formation Histories of its ETGs