Now showing items 21-30 of 104
Astronomical Engineering: A Strategy For Modifying Planetary Orbits
(Kluwer Academic Publishers; Springer Science+Business Media, 2001-03)
The Sun's gradual brightening will seriously compromise the Earth'sbiosphere within ∼ 10 9 years. If Earth's orbit migrates outward,however, the biosphere could remain intact over the entiremain-sequence lifetime of the ...
Implications of primordial black holes on the first stars and the origin of the super-massive black holes
(Blackwell Publishing Ltd, 2009-11-01)
If the cosmological dark matter has a component made of small primordial black holes (BHs), they may have a significant impact on the physics of the first stars and on the subsequent formation of massive BHs. Primordial ...
On the genealogy of the Orphan Stream
(Blackwell Publishing Ltd, 2008-09-21)
We use N -body simulations to explore the origin and a plausible orbit for the Orphan Stream, one of the faintest substructures discovered so far in the outer halo of our Galaxy. We are able to reproduce its position, ...
The evolution of massive black hole seeds
(Blackwell Publishing Ltd, 2008-01-21)
We investigate the evolution of high-redshift seed black hole masses at late times and their observational signatures. The massive black hole seeds studied here form at extremely high redshifts from the direct collapse of ...
Effects of mergers and core structure on the bulk properties of nearby galaxy clusters
(Univ Chicago Press, 2006-03-01)
We use X-ray morphological measurements and the scatter of clusters about observed and simulated scaling relations to examine the impact of merging and core-related phenomena on the structure of galaxy clusters. We use a ...
Clustering of dark matter halos on the light cone: Scale, time, and mass dependence of the halo biasing in the Hubble volume simulations
(Univ Chicago Press, 2001-11-10)
We develop a phenomenological model to predict the clustering of dark matter halos on the light cone by combining several existing theoretical models. Assuming that the velocity field of halos on large scales is approximated ...
PHYSICS 140 - General Physics 1, Fall 2007
(Open.Michigan, 2007-09)
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Stratification and isotope separation in CP stars ★
(Blackwell Publishing Ltd, 2009-06-11)
We investigate the elemental and isotopic stratification in the atmospheres of selected chemically peculiar (CP) stars of the upper main sequence. Reconfiguration of the UV-Visual Echelle Spectrograph in 2004 has made it ...
Measuring the Mean and Scatter of the X-Ray Luminosity-Optical Richness Relation for maxBCG Galaxy Clusters
(Univ Chicago Press, 2007-03-01)
Determining the scaling relations between galaxy cluster observables requires large samples of uniformly observed clusters. We measure the mean X-ray luminosity-optical richness (L¯X-N¯200) relation for an approximately ...
The dependence of H ii region properties on global and local surface brightness within galaxy discs
(Blackwell Publishing Ltd, 2009-02-21)
Using B , R and HΑ images of roughly equal-sized samples of low surface brightness (LSB) and high surface brightness (HSB) galaxies (∼40 galaxies apiece), we have explored the dependence of H ii region properties on local ...