Measuring the Growth of Structure with Spectroscopically Identified Galaxy Groups and Clusters
Number counts of galaxy clusters offer a very promising probe of the Dark Energy (DE) equation-of-state parameter, w. The basic goal is to measure abundances of these objects as a function of redshift, compare this to a theoretical prediction, and infer the values of cosmological parameters. Various...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2008
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.258.3601 http://arxiv.org/pdf/astro-ph/0507555v1.pdf |
| Summary: | Number counts of galaxy clusters offer a very promising probe of the Dark Energy (DE) equation-of-state parameter, w. The basic goal is to measure abundances of these objects as a function of redshift, compare this to a theoretical prediction, and infer the values of cosmological parameters. Various teams have proposed such a measurement, including the South Pole Telescope, the Dark Energy Survey and the Red-Sequence Cluster Survey. The specific study discussed here detects clusters and smaller galaxy groups in the threedimensional distribution of galaxies inferred from a large spectroscopic redshift survey. This method allows the abundance, N, of groups and clusters to be measured as a function of velocity dispersion, as well as of redshift, permitting a more sensitive test of cosmology. This test is one of the principal science goals of the DEEP2 Galaxy Redshift Survey, a spectroscopic survey of ∼ 50000 galaxies over a primary redshift range of 0.7 ≤ z ≤ 1.4, using the DEIMOS spectrograph on the ten-meter Keck II telescope. The survey, which is now nearly complete, has surveyed ∼ 3 square degrees on the sky to a limiting magnitude of RAB = 24.1, with a sampling rate of ∼ 60 % in the targeted redshift range. The full survey required 80 nights of observation at Keck. |
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