SIMBAD references

2008ApJ...685L.113S - Astrophys. J., 685, L113-L116 (2008/October-1)

Spitzer/MIPS 24 µm observations of galaxy clusters: an increasing fraction of obscured star-forming members from z = 0.02 to z = 0.83.


Abstract (from CDS):

We study the mid-infrared properties of 1315 spectroscopically confirmed members in eight massive (Mvir≳5x1014 M) galaxy clusters covering the redshift range from 0.02 to 0.83. The selected clusters all have deep Spitzer/MIPS 24 µm observations, Hubble and ground-based photometry, and extensive redshift catalogs. We observe for the first time an increase in the fraction of cluster galaxies with mid-infrared star formation rates higher than 5 M/yr from 3% at z=0.02 to 13% at z=0.83 (RP≤1 Mpc). This increase is reproduced even when considering only the most massive members (M*≥4x1010 M). The 24 µm observations reveal stronger evolution in the fraction of blue/star-forming cluster galaxies than in color-selected samples: the number of dusty, strongly star-forming cluster galaxies increases with redshift, and combining these with the optically defined Butcher-Oemler members [Δ(B-V)←0.2] doubles the total fraction of blue/star-forming galaxies in the inner Mpc of the clusters to ∼23% at z=0.83. These results, the first of our Spitzer/MIPS Infra-Red Cluster Survey (SMIRCS), support earlier studies indicating that the increase in star-forming members is driven by cluster assembly and galaxy infall, as is expected in the framework of hierarchical formation.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Evolution - Galaxies: Fundamental Parameters

Status at CDS:  

Simbad objects: 10

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