DoE LPPC 2006
... objects with broad features in spectrum Photo-z gives redshifts (to 10%) from the colors of luminous red galaxies (LRG) Cluster member galaxies have scatter in redshift at 3% level PISCO measures photo-z’s of all galaxies in a cluster at once, in a single exposure ...
... objects with broad features in spectrum Photo-z gives redshifts (to 10%) from the colors of luminous red galaxies (LRG) Cluster member galaxies have scatter in redshift at 3% level PISCO measures photo-z’s of all galaxies in a cluster at once, in a single exposure ...
matter and dark energy Gravitational lensing: a unique probe of dark
... considered the additional deflection arising from the curvature of space around the Sun in his newly published general theory, from which he derived δ = 4GM /Rc 2 and a solar deflection of 1.75 arcsec. Beginning in 1912, Einstein sought out observers who could verify his predicted deflection (notwit ...
... considered the additional deflection arising from the curvature of space around the Sun in his newly published general theory, from which he derived δ = 4GM /Rc 2 and a solar deflection of 1.75 arcsec. Beginning in 1912, Einstein sought out observers who could verify his predicted deflection (notwit ...
DETAILED STELLAR POPULATION ANALYSIS OF GALAXY
... GEMINI/HST Galaxy Cluster Project (PIs I. Jorgensen & R. Davies. For the Gemini/HST Galaxy Cluster Project, a sample of 15 galaxy clusters with redshifts between 0.2 and 1 were chosen based on their X-ray luminosities. The sample is limited to clusters with X-ray luminosities larger than LX = 2 × 10 ...
... GEMINI/HST Galaxy Cluster Project (PIs I. Jorgensen & R. Davies. For the Gemini/HST Galaxy Cluster Project, a sample of 15 galaxy clusters with redshifts between 0.2 and 1 were chosen based on their X-ray luminosities. The sample is limited to clusters with X-ray luminosities larger than LX = 2 × 10 ...
Weak gravitational lensing
While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak lensing regime, in which the deflection is impossible to detect in a single background source. However, even in these cases, the presence of the foreground mass can be detected, by way of a systematic alignment of background sources around the lensing mass. Weak gravitational lensing is thus an intrinsically statistical measurement, but it provides a way to measure the masses of astronomical objects without requiring assumptions about their composition or dynamical state.