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Probing Density Fluctuations in the Universe with the FIRST Radio Survey

Published online by Cambridge University Press:  25 May 2016

C.M. Cress
C.M. Cress*
Affiliation:
Astronomy Dept., Columbia Univ., New York, NY10027

Extract

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We compare the angular correlation function measured for FIRST sources (Becker et al., Cress et al.) with COBE-normalized CDM-model predictions (Cress & Kamionkowski). We note that uncertainties in the z-distribution do not affect the predictions dramatically and that the effects of non-linear evolution of the power spectrum are significant for θ<∼20′. We find the CF at larger angles to be sensitive to clustering of nearby sources. The smaller angle measurements, when combined with results from other surveys (Loan et al., Rengelink et al.) indicate that the bias required for the data to fit CDM models increases as the surveys probe deeper. We also point the reader to Refregier et al. for information on the use of weak lensing of FIRST sources in probing foreground mass.

Type
IV. Structure Formation and Dark Matter
Information
Symposium - International Astronomical Union , Volume 183: Cosmological Parameters and the Evolution of the Universe , 1999 , pp. 244
Copyright
Copyright © Kluwer 1999 

References

Becker, R. H., White, R. L., & Helfand, D. J. 1995, ApJ, 450, 559 (BWH) Google Scholar
Cress, C. M., Helfand, D. J., Becker, R. H., Gregg, M. D., & White, R. L. 1996, ApJ, 473, 7 Google Scholar
Cress, C. M. & Kamionkowski, M., submitted to MNRAS Google Scholar
Refregier, A. et al. 1997, in preparation Google Scholar
Loan, A. J., Wall, J. V., Lahav, O., 1996, MNRAS, 286, 994 Google Scholar
Rengelink, et al., 1997, in this volume Google Scholar