Washington CCD Photometry of the Bulge Globular Cluster NGC 6624

Details Washington CCD Photometry of the Bulge Globular Cluster NGC 6624 Washington CCD Photometry of the Bulge Globular Cluster NGC 6624

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jkass..29..141y&link_type=abstract

Journal of the Korean Astronomical Society, v. 29 Supplement, p.S141

Astronomy and Astrophysics

Astronomy

Scientific paper

The Cosmic Microwave Background Radiation (CMBR) provides the deepest probe that current technology can provide of the primordial state of the universe. This dissertation investigates microwave photons propagating through the evolving density inhomogeneities in a model universe filled with "hot" dark matter. The universe is modeled by a comoving cube ranging in size from 165 Mpc to 825 Mpc in which the dark matter is allowed to collapse following first order gravitational perturbation theory. Microwave background photons are propagated through this evolving universe, beginning at a redshift of z = 1900 just before the epoch of decoupling until the present z = 0 and subjected to the Sachs-Wolfe effect and Thomson scattering off the ionized fraction of the inter-galactic medium (IGM), including the Doppler shifts suffered by the CMB photons during the Thomson scattering. The simulation follows the evolving matter inhomogeneities and microwave background photons into the present nonlinear regime and yields temperature via maps of the microwave sky as a comoving observer would detect. If Omega _{rm o} = 1.0 and H _{rm o} = 100km/s Mpc^ {-1}, the level of Delta T/T of the CMBR in this model universe is in good agreement with observations. If Omega_ {rm o}, is substantially less than unity, or if H_{rm o}~50km/s Mpc^{-1}, I find that temperature anisotropies are substantially above observational levels for this particular choice of dark matter. Effects which could lead to a reduction of Delta T/T in these models, such as a late reionization of the IGM are investigated in two models. If reionization is caused by a late and sudden energy input into the IGM, I find that some reduction in Delta T/T of the CMBR occurs, but not enough to make either model consistent with observations. If, however, reionization is caused by the decay of the dark matter, I find that Delta T/T is reduced to observational levels. I find that in the reionized scenarios the contribution to Delta T/T caused by the Doppler shifts are substantial and in some models dominate the microwave sky.

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