powerpoint
... Clusters of Galaxies • In 20’s, Zwicky pointed out that the velocity dispersion of the Coma cluster is inconsistent with its self-gravity • One expects v2=GM/R, the mass inferred this way is 100 times larger than the inferred stellar mass ...
... Clusters of Galaxies • In 20’s, Zwicky pointed out that the velocity dispersion of the Coma cluster is inconsistent with its self-gravity • One expects v2=GM/R, the mass inferred this way is 100 times larger than the inferred stellar mass ...
UNIVERSITY OF SOUTHAMPTON PHYS2013W1 SEMESTER 1
... A3. Explain the main evidence that there must be a large amount of dark matter in the halo of our Galaxy. Give an example of the measurements that were used to obtain this evidence. ...
... A3. Explain the main evidence that there must be a large amount of dark matter in the halo of our Galaxy. Give an example of the measurements that were used to obtain this evidence. ...
Shane Spivey University of Texas at Arlington
... Can explain structure formation Can account for gravitational lensing Problems: CDM simulations produce cuspy cores CDM predicts more dwarf galaxies than are observed Solution: Quantum Cold Dark Matter? ...
... Can explain structure formation Can account for gravitational lensing Problems: CDM simulations produce cuspy cores CDM predicts more dwarf galaxies than are observed Solution: Quantum Cold Dark Matter? ...
Cosmology
... • Clusters and groups of galaxies are gravitationally bound together, however the clusters and groups spread away from each other as the Universe expands. ...
... • Clusters and groups of galaxies are gravitationally bound together, however the clusters and groups spread away from each other as the Universe expands. ...
Can Gravity Explain the Pioneer 10-11 Anomaly
... cosmological data. The theory has an extra degree of freedom, a vector field called a “phion” field whose curl is a skew field that couples to matter (“fifth force”). The gravitational field is described by a symmetric Einstein metric tensor. • The effective classical theory allows the gravitational ...
... cosmological data. The theory has an extra degree of freedom, a vector field called a “phion” field whose curl is a skew field that couples to matter (“fifth force”). The gravitational field is described by a symmetric Einstein metric tensor. • The effective classical theory allows the gravitational ...
Galaxy3
... the luminosity of the galaxy is the same as if there where 3 x 1011 Suns in this galaxy. That means it has about 3 x 1011 times the mass of the Sun. • To do a better estimate, you look at the luminosity function, which tells you how many high mass stars, medium mass stars and low mass stars make up ...
... the luminosity of the galaxy is the same as if there where 3 x 1011 Suns in this galaxy. That means it has about 3 x 1011 times the mass of the Sun. • To do a better estimate, you look at the luminosity function, which tells you how many high mass stars, medium mass stars and low mass stars make up ...
Field - Cosmos
... • Contrary to cosmology goals, in group studies the least massive group is the most treasured • Unprecedented XMM coverage of COSMOS and CDFS enabled the study of barionic budget of groups and environmental dependence of SFR to a z~1 • Extension of those surveys towards higher-z (DEEP2) and higher m ...
... • Contrary to cosmology goals, in group studies the least massive group is the most treasured • Unprecedented XMM coverage of COSMOS and CDFS enabled the study of barionic budget of groups and environmental dependence of SFR to a z~1 • Extension of those surveys towards higher-z (DEEP2) and higher m ...
Disk Galaxies: Structural Components
... • Collapse of an over-dense region of space (containing more gas and dark matter than average) under gravity • Disks are produced as the cloud of material spins faster and faster as the gravitational collapse progresses • To conserve angular momentum, the spin speed must increase inversely proportio ...
... • Collapse of an over-dense region of space (containing more gas and dark matter than average) under gravity • Disks are produced as the cloud of material spins faster and faster as the gravitational collapse progresses • To conserve angular momentum, the spin speed must increase inversely proportio ...
Moffat
... • A fitting routine has been applied to fit a large number of galaxy rotation curves (101 galaxies), using photometric data (58 galaxies) and a core model (43 galaxies) (Brownstein and JWM, 2005). The fits to the data are remarkably good and for the photometric data only one parameter, the mass-to-l ...
... • A fitting routine has been applied to fit a large number of galaxy rotation curves (101 galaxies), using photometric data (58 galaxies) and a core model (43 galaxies) (Brownstein and JWM, 2005). The fits to the data are remarkably good and for the photometric data only one parameter, the mass-to-l ...
The “Tuning Fork” Diagram Galaxy Properties 1 “Early”
... E galaxy = K star convolved with Gaussian velocity distribution of stars. ...
... E galaxy = K star convolved with Gaussian velocity distribution of stars. ...
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.