Future Supernova Projects
... • small dispersion • single objects (simpler than galaxies) • can be observed over wide z range Challenges: • dust (grey dust) • chemical composition • evolution • photometric calibration (e.g., Vega) • environmental differences Systematics • lensing Step 2 ...
... • small dispersion • single objects (simpler than galaxies) • can be observed over wide z range Challenges: • dust (grey dust) • chemical composition • evolution • photometric calibration (e.g., Vega) • environmental differences Systematics • lensing Step 2 ...
Using AO to Measure the Star Formation Histories of Massive Galaxies
... are needed to see this picture. ...
... are needed to see this picture. ...
Radio Telescopes Consolidation Activity
... Any value correctly calculated from the Hα wavelength in question 1 is acceptable. For example, λ = 6600 Angstroms gives z = 0.006 4. v = z x c. Using z = 0.003 gives 900 km s-1 Any answer consistent with value of z from question 3 is acceptable. For example, vrec = 1,800 km s-1 (for z = 0.006) 5. H ...
... Any value correctly calculated from the Hα wavelength in question 1 is acceptable. For example, λ = 6600 Angstroms gives z = 0.006 4. v = z x c. Using z = 0.003 gives 900 km s-1 Any answer consistent with value of z from question 3 is acceptable. For example, vrec = 1,800 km s-1 (for z = 0.006) 5. H ...
Cosmological Constraints from the Virial Mass
... an X-ray-selected sample of systems from the ROSAT All-Sky Survey in the region 6 > 0' and 0.01 < z < 0.06, with target galaxies for each system compiled from the Two Micron All Sky Survey (2MASS). The sample is designed to focus on lowmass groups and clusters, so as to break a degeneracy between th ...
... an X-ray-selected sample of systems from the ROSAT All-Sky Survey in the region 6 > 0' and 0.01 < z < 0.06, with target galaxies for each system compiled from the Two Micron All Sky Survey (2MASS). The sample is designed to focus on lowmass groups and clusters, so as to break a degeneracy between th ...
doc - StealthSkater
... These conditions allow to solve the equations of motions for ez, eT, and l for each star involved. The mass of the star does not matter at all. In the hydrodynamical model, correlations between velocities of stars are forced by idealization as continuous matter. In this case, the flow lines correspo ...
... These conditions allow to solve the equations of motions for ez, eT, and l for each star involved. The mass of the star does not matter at all. In the hydrodynamical model, correlations between velocities of stars are forced by idealization as continuous matter. In this case, the flow lines correspo ...
Nuclear Activity in UZC Compact Groups of Galaxies M.A. Martinez
... We have inspected three database archives looking for UZC-CG galaxies spectra. The databases are the Z-Machine Spectrograph Archive, the FAST Spectrograph Archive and the Sloan Digital Sky Survey DR4. We have found 652, 246 and 221 spectra respectively. In several cases the spectrum of the same gala ...
... We have inspected three database archives looking for UZC-CG galaxies spectra. The databases are the Z-Machine Spectrograph Archive, the FAST Spectrograph Archive and the Sloan Digital Sky Survey DR4. We have found 652, 246 and 221 spectra respectively. In several cases the spectrum of the same gala ...
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.