powerpoint
... As for the overall • As for the overall distribution of clusters you will have noticed that they fall onto a spider web. • That is because all of the mass (read here the dark mass) tends to pull all the mass to centralized locations. • When two threads connect you get a cluster of galaxies (or even ...
... As for the overall • As for the overall distribution of clusters you will have noticed that they fall onto a spider web. • That is because all of the mass (read here the dark mass) tends to pull all the mass to centralized locations. • When two threads connect you get a cluster of galaxies (or even ...
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... If the lensing is not strong enough to split the images, but it does magnify and distort them, it is called weak lensing. This is the effect of the large-scale structure or the outskirts of clusters of galaxies on the background sources (galaxies). These image distortions can then be inverted to map ...
... If the lensing is not strong enough to split the images, but it does magnify and distort them, it is called weak lensing. This is the effect of the large-scale structure or the outskirts of clusters of galaxies on the background sources (galaxies). These image distortions can then be inverted to map ...
Where is the rest of the universe?
... Where is the rest of the Universe? If we can only “see” 4.9% of the universe, where is the other 95%? Dark matter Dark matter does not give off observable energy in any EM wavelength, but can be detected by watching the behavior of space objects. A few examples are: • The stars in the outer reaches ...
... Where is the rest of the Universe? If we can only “see” 4.9% of the universe, where is the other 95%? Dark matter Dark matter does not give off observable energy in any EM wavelength, but can be detected by watching the behavior of space objects. A few examples are: • The stars in the outer reaches ...
Gravitational redshift of Sirius B Equivalent velocity 80 km/s
... Equivalence principle – this situation should be the same ...
... Equivalence principle – this situation should be the same ...
EXERCISES: Set 4 of 4 Q1: (You will need a ruler and a calculator
... Calculate the ratio of rms mass fluctuations between the particle horizon now and the fluctuations at R = 1 Mpc [You can assume an EdS cosmology here] adopting n = 1 (a scale invariant power spectrum). Q8(e): The correlation function of star forming galaxies at redshift z = 3 can be well approximate ...
... Calculate the ratio of rms mass fluctuations between the particle horizon now and the fluctuations at R = 1 Mpc [You can assume an EdS cosmology here] adopting n = 1 (a scale invariant power spectrum). Q8(e): The correlation function of star forming galaxies at redshift z = 3 can be well approximate ...
Space Place
... space, your line of sight will eventually run into a luminous object: a star, a galaxy or a cluster of galaxies. In reality, the universe is finite in age, so this isn't quite the case. There are objects that emit light from the past 13.7 billion years—99 percent of the age of the universe—but none ...
... space, your line of sight will eventually run into a luminous object: a star, a galaxy or a cluster of galaxies. In reality, the universe is finite in age, so this isn't quite the case. There are objects that emit light from the past 13.7 billion years—99 percent of the age of the universe—but none ...
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.