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Simulating Galaxy Evolution
Joseph Silk, Rychard J. Bouwens
The forwards approach to galaxy formation and evolution is extremely powerful but leaves several questions unanswered. Foremost among these is the origin of disks. A backwards appr…
Temperature Correlations in a Finite Universe
Evan Scannapieco, Janna Levin, Joseph Silk
We study the effect of a finite topology on the temperature correlations of the cosmic microwave background in a flat universe. Analytic expressions for the angular power spectrum…
The WOMBAT Challenge: A "Hounds and Hares" Exercise for Cosmology
Eric Gawiser, Douglas Finkbeiner, Andrew Jaffe +10
The Wavelength-Oriented Microwave Background Analysis Team (WOMBAT) is constructing microwave skymaps which will be more realistic than previous simulations. Our foreground models…
From the Cosmological Microwave Background to Large-Scale Structure
Joseph Silk, Eric Gawiser
The shape of the primordial fluctuation spectrum is probed by cosmic microwave background fluctuations which measure density fluctuations at z~1000 on scales of hundreds of Mpc and…
A Look At Three Different Scenarios for Bulge Formation
Rychard J. Bouwens, Laura Cayon, Joseph Silk
In this paper, we present three qualitatively different scenarios for bulge formation: a secular evolution model in which bulges form after disks and undergo several central starbu…
Formation of Bulges
Joseph Silk, Rychard J. Bouwens
Bulges, often identified with the spheroidal component of a galaxy, have a complex pedigree. Massive bulges are generally red and old, but lower mass bulges have broader dispersion…
Detection of Evolved High-Redshift Galaxies in Deep NICMOS/VLT Images
Narciso Benitez, Tom Broadhurst, Rychard Bouwens +2
A substantial population of high redshift early-type galaxies is detected in very deep UBVRIJHK images towards the HDF-South. Four elliptical profile galaxies are identified in the…
Observational Constraints on Microwave Anisotropy from Point Sources
Eric Gawiser, Andrew Jaffe, Joseph Silk
Applying basic physical principles to recent observational results, we derive upper and lower limits on microwave anisotropy from point sources over the range of frequencies 10-100…
Cloning Hubble Deep Fields II: Models for Evolution by Bright Galaxy Image Transformation
Rychard J. Bouwens, Tom Broadhurst, Joseph Silk
In a companion paper we outlined a methodology for generating parameter-free, model-independent ``no-evolution'' fields of faint galaxy images, demonstrating the need for significa…
Cloning Hubble Deep Fields I: A Model-Independent Measurement of Galaxy Evolution
Rychard J. Bouwens, Tom Broadhurst, Joseph Silk
We present a model-independent method of quantifying galaxy evolution in high-resolution images, which we apply to the Hubble Deep Field (HDF). Our procedure is to k-correct all pi…
Simulated NGST Observations
D. Burgarella, R. Bouwens, T. Broadhurst +3
This paper presents the results of simulated NGST observations. The goal of this work is to study the detectability of very high redshift galaxies and to try to characterize Wide D…
Australia Telescope Search for Cosmic Microwave Background Anisotropy
Ravi Subrahmanyan, Michael J. Kesteven, Ronald D. Ekers +2
We have made an 8.7 GHz image of a sky region with a resolution of 8 arcmin and high brightness sensitivity using the Australia Telescope Compact Array (ATCA). in an ultra compact…
A Simultaneous Constraint on the Amplitude and Gaussianity of Mass Fluctuations in the Universe
James Robinson, Eric Gawiser, Joseph Silk
We consider constraints on the amplitude of mass fluctuations in the universe, sigma_8, derived from two simple observations: the present number density of clusters and the amplitu…
Deprojection of Rich Cluster Images
S. Zaroubi, G. Squires, Y. Hoffman +1
We consider a general method of deprojecting 2D images to reconstruct the 3D structure of the projected object, assuming axial symmetry. The method consists of the application of t…
The Age and Metallicity Range of Early-Type Galaxies in Clusters
I. Ferreras, S. Charlot, J. Silk
We present an unbiased method for evaluating the ranges of ages and metallicities which are allowed by the photometric properties of the stellar populations that dominate the light…