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Feedback, Disk Self-regulation and Galaxy Formation
Joseph Silk
Self-regulation of star formation in disks is controlled by two dimensionless parameters: the Toomre parameter for gravitational instability and the porosity of the interstellar me…
Peaks in the Cosmic Microwave Background: flat versus open models
R. B. Barreiro, J. L. Sanz, E. Martinez-Gonzalez +2
We present properties of the peaks (maxima) of the CMB anisotropies expected in flat and open CDM models. We obtain analytical expressions of several topological descriptors: mean…
From Local Velocities to Microwave Background
S. Zaroubi, N. Sugiyama, J. Silk +2
The mass density field as extracted from peculiar velocities in our cosmological neighborhood is mapped back in time to the CMB in two ways. First, the density power spectrum ($P_k…
Colors and K-Band Counts of Extremely Faint Field Galaxies
Leonidas A. Moustakas, Marc Davis, James R. Graham +3
We combine deep K-band (Keck) with V- and I-band (NTT) observations of two high-Galactic latitude fields, surveying a total of ~2 sq. arcmin. The K-band galaxy counts continue to r…
Passive Evolution: Are the Faint Blue Galaxy Counts Produced by a Population of Eternally Young Galaxies?
Rychard J. Bouwens, Joseph Silk
A constant age population of blue galaxies, postulated in the model of Gronwall & Koo (1995), seems to provide an attractive explanation of the excess of very blue galaxies in the…
Angular Sizes of Faint Field Disk Galaxies: Intrinsic Luminosity Evolution
Laura Cayon, Joseph Silk, Stephane Charlot
In order to explain the small scale-lengths detected in the recent deep field observations performed from large ground-based telescopes and from the Hubble Space Telescope, we inve…
The Physics of Microwave Background Anisotropies
Wayne Hu, Naoshi Sugiyama, Joseph Silk
Cosmic microwave background anisotropies provide a vast amount of cosmological information. Their full physical content and detailed structure can be understood in a simple and int…
How small were the first cosmological objects?
Max Tegmark, Joseph Silk, Martin Rees +3
The minimum mass that a virialized gas cloud must have in order to be able to cool in a Hubble time is computed, using a detailed treatment of the chemistry of molecular hydrogen.…
CMB radiation power spectrum in CDM open universes up to 2nd order perturbations
Jose L. Sanz, Enrique Martinez-Gonzalez, Laura Cayon +2
A second--order perturbation theory approach is developed to calculate temperature anisotropies in the cosmic microwave background. Results are given for open universes and fluctua…
On the Effects of Bursts of Massive Star Formation During the Evolution of Elliptical Galaxies
Stephen E. Zepf, Joseph Silk
We consider the hypothesis that the formation of elliptical galaxies includes a phase in which star formation is mostly restricted to massive stars, with the bias towards high mass…