• Subhabrata Majumdar

      Articles written in Pramana – Journal of Physics

    • Constraining cosmological parameters through Sunyaev-Zel’dovich surveys

      Subhabrata Majumdar Ravi Subrahamanyan

      More Details Abstract Fulltext PDF

      For cold dark matter models, images of temperature fluctuations in the cosmic microwave background (CMB), due to Sunyaev Zel’dovich (SZ) effect have been been simulated taking a cosmolgical distribution of clusters into account. All the models are normalised to the 4-year COBE data. The image statistics are compared with the ATCA limits on arcmin scale anisotropy. The comparison appears to favour low-Ω0 open universe models.

    • Cosmology with cluster surveys

      Subhabrata Majumdar

      More Details Abstract Fulltext PDF

      Surveys of clusters of galaxies provide us with a powerful probe of the density and nature of the dark energy. The red-shift distribution of detected clusters is highly sensitive to the dark energy equation of state parameterw. Upcoming Sunyaev-Zel’dovich (SZ) surveys would provide us large yields of clusters to very high red-shifts. Self-calibration of cluster scaling relations, possible for such a huge sample, would be able to constrain systematic biases on mass estimators. Combining cluster red-shift abundance with limited mass follow-up and cluster mass power spectrum can then give constraints onw, as well as onσ8 and ΩM to a few per cents.

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