Huang.ppt
... • Thawing: w monotonically deviate from -1. • Freezing: w monotonically approaches -1. • Our parameterization with flat priors. Roughly 15 percent thawing, 8 percent freezing, most are non-monotonic. With freezing prior: ...
... • Thawing: w monotonically deviate from -1. • Freezing: w monotonically approaches -1. • Our parameterization with flat priors. Roughly 15 percent thawing, 8 percent freezing, most are non-monotonic. With freezing prior: ...
![Centers of Galaxies = Black Holes and Quasars [23]](http://s1.studyres.com/store/data/008843283_1-4697566dc56b4edd03af8cb77cdecf4b-300x300.png)
Lecture 2
... 4) Redshift and the Expansion of the Universe Finally we look at the application of these ideas on the largest scales of all. If we consider only the forces which we know about from laboratory physics it seems clear that gravity must dominate on very large scales and therefore that the universe sho ...
... 4) Redshift and the Expansion of the Universe Finally we look at the application of these ideas on the largest scales of all. If we consider only the forces which we know about from laboratory physics it seems clear that gravity must dominate on very large scales and therefore that the universe sho ...
THE BIG BANG - Dublin City Schools
... • Singularity: The theory is that one single finite speck (much much smaller than a pin head) with extremely high density and temperature instantly started expanding and inflating. (like the surface of an inflated balloon) ...
... • Singularity: The theory is that one single finite speck (much much smaller than a pin head) with extremely high density and temperature instantly started expanding and inflating. (like the surface of an inflated balloon) ...
Powerpoint on redshift
... When you look at distant galaxies they don’t actually seem redder. The speed of light is too fast for us to be able to see a colour change. We see red shift as a movement of spectral absorption lines. The dark lines should always appear in the same place, as the atoms can only absorb certain w ...
... When you look at distant galaxies they don’t actually seem redder. The speed of light is too fast for us to be able to see a colour change. We see red shift as a movement of spectral absorption lines. The dark lines should always appear in the same place, as the atoms can only absorb certain w ...
The Universe - staff.harrisonburg.k12.va
... • If an object in space is moving towards us, its wavelength shortens, and the light shifts towards the blue end of the color spectrum. • If an object is moving away from us, its wavelength lengthens, and the light shifts towards the red end of the ...
... • If an object in space is moving towards us, its wavelength shortens, and the light shifts towards the blue end of the color spectrum. • If an object is moving away from us, its wavelength lengthens, and the light shifts towards the red end of the ...
Using Galaxy Clusters to Study Structure Evolution
... Shift- applies to sound and light » If source is moving with respect to observer, the observer experiences a shift in wavelength l » Velocities away from observer shift light to longer l (redshift) » Velocities toward observer shift light to shorter l (blueshift) » The higher the velocity the larger ...
... Shift- applies to sound and light » If source is moving with respect to observer, the observer experiences a shift in wavelength l » Velocities away from observer shift light to longer l (redshift) » Velocities toward observer shift light to shorter l (blueshift) » The higher the velocity the larger ...
The Universe
... • If an object is moving away from us, its wavelength lengthens, and the light shifts towards the red end of the color spectrum. ...
... • If an object is moving away from us, its wavelength lengthens, and the light shifts towards the red end of the color spectrum. ...
Gas and dust evolution in distant AGN
... At z>4 little information on NLR metallicity ...but information on gas in host galaxy for some QSOs ...
... At z>4 little information on NLR metallicity ...but information on gas in host galaxy for some QSOs ...
Redshift
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. In general, whether or not the radiation is within the visible spectrum, ""redder"" means an increase in wavelength – equivalent to a lower frequency and a lower photon energy, in accordance with, respectively, the wave and quantum theories of light.Some redshifts are an example of the Doppler effect, familiar in the change of apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles. A redshift occurs whenever a light source moves away from an observer. Another kind of redshift is cosmological redshift, which is due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase in their distance from Earth. Finally, gravitational redshift is a relativistic effect observed in electromagnetic radiation moving out of gravitational fields. Conversely, a decrease in wavelength is called blueshift and is generally seen when a light-emitting object moves toward an observer or when electromagnetic radiation moves into a gravitational field. However, redshift is a more common term and sometimes blueshift is referred to as negative redshift.Knowledge of redshifts and blueshifts has been applied to develop several terrestrial technologies such as Doppler radar and radar guns. Redshifts are also seen in the spectroscopic observations of astronomical objects. Its value is represented by the letter z.A special relativistic redshift formula (and its classical approximation) can be used to calculate the redshift of a nearby object when spacetime is flat. However, in many contexts, such as black holes and Big Bang cosmology, redshifts must be calculated using general relativity. Special relativistic, gravitational, and cosmological redshifts can be understood under the umbrella of frame transformation laws. There exist other physical processes that can lead to a shift in the frequency of electromagnetic radiation, including scattering and optical effects; however, the resulting changes are distinguishable from true redshift and are not generally referred to as such (see section on physical optics and radiative transfer).