The discovery of a massive supercluster at z=0.9 in the UKIDSS DXS
| Autor: | Swinbank, A. M., Edge, A., Smail, I., Stott, J., Bremer, M., Sato, Y., van Breukelen, C., Jarvis, M., Waddington, I., Clewley, L., Bergeron, J., Cotter, G., Dye, S., Geach, J., Gonzalez-Solares, E., Hirst, P., Ivison, R., Rawlings, S., Simpson, C., Smith, G. P., Verma, A., Yamada, T. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Mon.Not.Roy.Astron.Soc.379:1343-1351,2007 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2007.12037.x |
| Popis: | We analyse the first publicly released deep field of the UKIDSS Deep eXtragalactic Survey (DXS) to identify candidate galaxy over-densities at z~1 across ~1 sq. degree in the ELAIS-N1 field. Using I-K, J-K and K-3.6um colours we identify and spectroscopically follow-up five candidate structures with Gemini/GMOS and confirm they are all true over-densities with between five and nineteen members each. Surprisingly, all five structures lie in a narrow redshift range at z=0.89+/-0.01, although they are spread across 30Mpc on the sky. We also find a more distant over-density at z=1.09 in one of the spectroscopic survey regions. These five over-dense regions lying in a narrow redshift range indicate the presence of a supercluster in this field and by comparing with mock cluster catalogs from N-body simulations we discuss the likely properties of this structure. Overall, we show that the properties of this supercluster are similar to the well-studied Shapley and Hercules superclusters at lower redshift. Comment: In press at MNRAS, 11 pages, 5 figures |
| Databáze: | arXiv |
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