A search for protocliisters atz = 3.3 |
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Authors: | Ravi Subrahmanyan K R Anantharamaiah |
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Institution: | (1) Tata Institute of Fundamental Research, Radio Astronomy Centre, Post Box 8, 643001 Ootacamund;(2) Raman Research Institute, 560080 Bangalore |
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Abstract: | We have used the Very Large Array to image a single field in a set of adjacent frequency bands around 333.0 MHz in an attempt
to detect 21 cm emission from large scale H I inhomogeneities at a redshift of z = 3.3. Following the subtraction of continuum
radio sources, the absence of any spectral signals apart from that expected due to the system thermal noise has been used
to derive constraints on the evolutionary scenario leading to the formation of the present day clusters of galaxies. The observations
rule out the existence of H I protoclusters atz = 3.3 with masses ≃3.5 × 1014
M
⊙ in H I gas and space density exceeding (74 Mpc)−3. This indicates that the present day rich clusters of galaxies either formed as gaseous protocluster condensates prior toz = 3.3 or else they formed through the clustering of their constituent galaxies. |
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Keywords: | Clusters of galaxies formation HI observations HI regions cosmological protoclusters |
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