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Detall del Seminari (IEEC Weekly Colloquium)
| Measuring and Analysing the Clustering of Photometrically Selected Samples of Galaxies
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| DATA: 17-03-2010 ( 12:00 h - 13:00 h )
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| Conferenciant
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| Ashley Ross (University of Portsmouth)
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| Lloc
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| Sala de Graus II (Bellaterra)
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| Presentador
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| Martin Crocce
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| Resum
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| Wide-field, multi-band photometric surveys provide a wealth of data. The Sloan Digital Sky Survey (SDSS) has produced photometric redshift catalogs containing over 20 million galaxies and The Dark Energy Survey (DES) expects to obtain photometric redshifts for over 200 million galaxies. This extreme amount of data provides great opportunities for both the study of galaxies and of cosmology. After introducing the measurement and analysis techniques required to measure galaxy clustering, I will present measurements I have made using data from the SDSS photometric redshift catalog, split by galaxy type and redshift. Using the halo-model to interpret these measurements, I will show that early- and late-type galaxies must preferentially exist in separate dark matter halos. When split by redshift between z = 0.1 and 0.4, I will show that, at constant luminosity, the higher redshift galaxies display substantially higher clustering amplitudes. Halo model analysis implies this increase in amplitude can be explained by the formation of ~L* galaxies in halos of mass ~1012 h-1 M_solar. I will finish with a discussion of the prospects of future surveys, such as DES.
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