Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-16565
Saintonge, A; Tran, K V H; Holden, B P (2008). Spitzer/MIPS 24 μm observations of galaxy clusters: an increasing fraction of obscured star-forming members from z = 0.02 to z = 0.83. Astrophysical Journal Letters, 685(2):L113-L116.
PDF (Accepted manuscript, Version 2)
View at publisher
PDF (Accepted manuscript, Version 1)
We study the mid-infrared properties of 1315 spectroscopically confirmed members in eight massive (Mvirgtrsim 5 × 1014 Msun) 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 Msun yr−1 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* ≥ 4 × 1010 Msun). 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.
36 downloads since deposited on 06 Mar 2009
15 downloads since 12 months
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Dewey Decimal Classification:||530 Physics|
|Deposited On:||06 Mar 2009 10:26|
|Last Modified:||27 Nov 2013 16:57|
|Publisher:||Institute of Physics Publishing|
Users (please log in): suggest update or correction for this item
Repository Staff Only: item control page