Quasars and Active Galaxies
... • “Steady State”: As galaxies move apart from each other, new atoms are spontaneously created in empty space. These atoms coalesce to form new galaxies. The average density of the universe doesn’t change over time. There was no hot early universe. Quasars were the first evidence that the universe wa ...
... • “Steady State”: As galaxies move apart from each other, new atoms are spontaneously created in empty space. These atoms coalesce to form new galaxies. The average density of the universe doesn’t change over time. There was no hot early universe. Quasars were the first evidence that the universe wa ...
Announcements Homework. Final Exam. Isotropy of the CMB
... Matter density Î Both axes expressed as fraction of Critical Density. ...
... Matter density Î Both axes expressed as fraction of Critical Density. ...
Dark Matter in the Universe
... gravitating mass within the cluster’s radius, which measures almost 100 million light-years. In a typical case, when we add together the luminous matter and the x-ray-emitting hot gas, we are able to sense roughly 20 to 30 percent of the cluster’s total gravitating mass. The remainder, which is dark ...
... gravitating mass within the cluster’s radius, which measures almost 100 million light-years. In a typical case, when we add together the luminous matter and the x-ray-emitting hot gas, we are able to sense roughly 20 to 30 percent of the cluster’s total gravitating mass. The remainder, which is dark ...
My talk on CO at z=0 from Santiago in June, 2011
... • K. Sandstrom extending to KINGFISH/THINGS/HERACLES sample: ...
... • K. Sandstrom extending to KINGFISH/THINGS/HERACLES sample: ...
FEEDBACK IN THE LOCAL UNIVERSE: The
... radio source has returned upwards of 1061 erg to regions of the cluster that extend even beyond the cooling radius. Note the strong spatial anti-correlation of the radio source (in pink) with the X-ray cavities (in blue). Such correspondence is typical of cool core clusters with cavities and extende ...
... radio source has returned upwards of 1061 erg to regions of the cluster that extend even beyond the cooling radius. Note the strong spatial anti-correlation of the radio source (in pink) with the X-ray cavities (in blue). Such correspondence is typical of cool core clusters with cavities and extende ...
Here`s
... One of the most complicated and dramatic collisions between galaxy clusters ever seen is captured in this new composite image of Abell 2744. The blue shows a map of the total mass concentration (mostly dark matter). By fitting a theoretical model of the composition of the Universe to the combined se ...
... One of the most complicated and dramatic collisions between galaxy clusters ever seen is captured in this new composite image of Abell 2744. The blue shows a map of the total mass concentration (mostly dark matter). By fitting a theoretical model of the composition of the Universe to the combined se ...
Dark Matter Spiral Structure Basic Galaxy Morphology Disk Galaxy Rotation Curves:
... Hot gas " Cold gas and dust Old " Still forming High luminosity density " Low lum. dens. … etc. But, for example, masses, luminosities, sizes, etc., do not correlate well with the Hubble type: at every type there is a large spread in these fundamental properties. ...
... Hot gas " Cold gas and dust Old " Still forming High luminosity density " Low lum. dens. … etc. But, for example, masses, luminosities, sizes, etc., do not correlate well with the Hubble type: at every type there is a large spread in these fundamental properties. ...
low surface brightness galaxies
... in marked contrast to naive expectations based on the growth of dark matter halos in hierarchical CDM cosmologies. ...
... in marked contrast to naive expectations based on the growth of dark matter halos in hierarchical CDM cosmologies. ...
What Shapes the Local Universe Galaxy Luminosity Function?
... spirals should be blue and the majority of ellip3cals and len3culars should be red. Previous studies of local luminosity func3ons with morphology-‐selected samples have largely produced conflic3ng ...
... spirals should be blue and the majority of ellip3cals and len3culars should be red. Previous studies of local luminosity func3ons with morphology-‐selected samples have largely produced conflic3ng ...
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.