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How Lumpy is the Milky Way's Dark Matter Halo?
Kathryn V. Johnston, David N. Spergel, Christian Haydn
CDM simulations predict that there are hundreds of lumps of with masses greater than 10e7 solar masses in the Milky Way halo. However, we know of only a dozen dwarf satellites clos…
Predictions for the Counts of Faint, High-Redshift Galaxies in the Mid-Infrared
Zoltan Haiman, David N. Spergel, Edwin L. Turner
Deep mid-infrared (MIR) observations could reveal a population of faint, high-redshift (z>3) dusty starburst galaxies that are the progenitors of present-day spheroids or bulges, a…
Dark energy and cosmic microwave background bispectrum
Licia Verde, David N. Spergel
We compute the cosmic microwave background bispectrum arising from the cross-correlation of primordial, lensing and Rees-Sciama signals. The amplitude of the bispectrum signal is s…
Measurement of the cosmic microwave background bispectrum on the COBE DMR sky maps
Eiichiro Komatsu, Benjamin D. Wandelt, David N. Spergel +2
We measure the angular bispectrum of the cosmic microwave background (CMB) radiation anisotropy from the COBE Differential Microwave Radiometer (DMR) four-year sky maps. The angula…
Are Clusters Standard Candles? Galaxy Cluster Scaling Relations With the Sunyaev-Zeldovich Effect
Licia Verde, Zoltan Haiman, David N. Spergel
An extensive sample of galaxy clusters will be available in the coming years, detected through their Sunyaev-Zeldovich effect (SZE). We use a semi-analytic model to study the scien…
Rayleigh Scattering and Microwave Background Fluctuations
Qingjuan Yu, David N. Spergel, Jeremiah P. Ostriker
During the recombination epoch, cosmic background photons couple not only to free electrons through Thompson scattering, but also to the neutral hydrogen through Rayleigh scatterin…
A New Pupil for Detecting Extrasolar Planets
David N. Spergel
The challenge for optical detection of terrestial planet is the 25 magnitude brightness contrast between the planet and its host star. This paper introduces a new pupil design that…
Three Dimensional Structure of the Milky Way Disk
R. Drimmel, D. N. Spergel
We present a three dimensional model for the Milky Way fit to the far-infrared (FIR) and near-infrared (NIR) data from the COBE/DIRBE instrument for Galactic latitudes |b| < 30 deg…