Star Formation in the XMMU J2235.3-2557 Galaxy Cluster at z=1.39
| Autor: | Bauer, Amanda E., Grutzbauch, Ruth, Jorgensen, Inger, Varela, Jesus, Bergmann, Marcel |
|---|---|
| Rok vydání: | 2010 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2010.17828.x |
| Popis: | We present the first results of a narrow-band photometric study of the massive galaxy cluster XMMU J2235.3-2557 at z=1.39. We obtained deep $H$ narrow-band imaging with NIRI on Gemini North, corresponding to H-alpha emission at the cluster's redshift. Our sample consists of 82 galaxies within a radius of ~500 kpc, ten of which are spectroscopically confirmed cluster members. Sixteen galaxies are identified as excess line-emitters. Among just the excess line-emitting galaxies we find an average SFR of 3.6 +/- 1.3 Msun/yr. For spectroscopically confirmed cluster members we find a correlation between H broad-band magnitude and SFR such that brighter galaxies have lower SFRs. The probability that SFR and magnitude of confirmed members are uncorrelated is 0.7%. We also find a correlation between SFR and distance from the cluster centre for both confirmed and excess line-emitting candidate members, with a probability of 5% for there to be no correlation among confirmed members. All excess line-emitting candidate cluster members are located outside a radius of 200 kpc. We conclude that star formation is effectively shut off within the central 200 kpc radius (R_QUENCH ~ 200 kpc) of this massive galaxy cluster at z=1.39, when the universe was only 4.5 Gyr old. Comment: 11 pages, 5 figures, 1 table, accepted for publication in MNRAS |
| Databáze: | arXiv |
| Externí odkaz: |
|