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| Paper: |
The Spatial Distribution of Post-Starburst Galaxies in the Massive Intermediate-Redshift Cluster MACSJ0717.5+3745 |
| Volume: |
399, Panoramic Views of Galaxy Formation and Evolution |
| Page: |
378 |
| Authors: |
Ma, C.-J.; Ebeling, H. |
| Abstract: |
We present the results of a wide-field spectroscopic analysis of the galaxy population of the massive cluster MACSJ0717.5+3745 and the surrounding filamentary structure (z=0.55), as part of our systematic study of the 12 most distant clusters in the MACS sample. Of 1368 galaxies spectroscopically observed in this field, 563 are identified as cluster members; of those, 203 are classified as emission-line galaxies, 260 as absorption-line galaxies, and 17 as E+A galaxies. 16 out of 17 E+A galaxies lie (in projection) within the rampressure stripping radius arround the cluster core, which we take to be direct evidence of ram-pressure stripping being the primary mechanism that terminates star-formation in the E+A population of galaxy clusters. This conclusion is supported by the rarity of E+A galaxies in the filament which rules out galaxy mergers as the dominant driver of evolution for E+A galaxies in clusters. |
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