The paper on the Hubble constant published in 2010
... In order to answer these questions, Sec. II contains three introductory paragraphs on sample moments, the weighted mean and the determination of the so-called ”exact value” of the Hubble constant. Section III reviews the basic system of magnitudes, a review of two alternative mechanisms for the reds ...
... In order to answer these questions, Sec. II contains three introductory paragraphs on sample moments, the weighted mean and the determination of the so-called ”exact value” of the Hubble constant. Section III reviews the basic system of magnitudes, a review of two alternative mechanisms for the reds ...
Galaxy Growth and Classification
... major groups called early-type (including ellipticals and S0s) and late-type galaxies (spirals). Hubble thought that galaxies in time moved from left to right in his Hubble Tuning Fork diagram but he was wrong. We will see why. 2. The color of galaxies The Sloan Digital Sky Survey SDSS has images a ...
... major groups called early-type (including ellipticals and S0s) and late-type galaxies (spirals). Hubble thought that galaxies in time moved from left to right in his Hubble Tuning Fork diagram but he was wrong. We will see why. 2. The color of galaxies The Sloan Digital Sky Survey SDSS has images a ...
ppt - University of Arizona
... How to Search for “First Light”? • When did the first objects form – what redshift range should be searched? • What are the characteristics of the first sources? Which were most important: black holes or stars? Should we base our assumptions on Super Star Clusters or dwarf galaxies or …. Will th ...
... How to Search for “First Light”? • When did the first objects form – what redshift range should be searched? • What are the characteristics of the first sources? Which were most important: black holes or stars? Should we base our assumptions on Super Star Clusters or dwarf galaxies or …. Will th ...
Astro Review - Blank - Mayfield City Schools
... 2. __b___ Is the following sentence true or false? All distant galaxies are moving away from ours because our galaxy is at the center of the universe. a. true b. false 3. __c___ The _________________ states that the universe began when a dense, hot, super massive singularity violently exploded. a. s ...
... 2. __b___ Is the following sentence true or false? All distant galaxies are moving away from ours because our galaxy is at the center of the universe. a. true b. false 3. __c___ The _________________ states that the universe began when a dense, hot, super massive singularity violently exploded. a. s ...
Advancing Physics A2
... Activity 110P Presentation 'Changes in velocity and rotation' Also uses File 50L Launchable File 'Doppler seen and heard' Many objects in the Universe spin on their axis or orbit around a more massive body. Typically this will result in components of their velocity, as seen from Earth, varying. Some ...
... Activity 110P Presentation 'Changes in velocity and rotation' Also uses File 50L Launchable File 'Doppler seen and heard' Many objects in the Universe spin on their axis or orbit around a more massive body. Typically this will result in components of their velocity, as seen from Earth, varying. Some ...
Chapter 10
... nucleus of our Galaxy, and what is the probable explanation? 7. Describe the factors involved in galactic formation, including the role of collisions between galaxies. 8. Be able to identify a galaxy by its shape, according to the Hubble sequence. 9. Compare and contrast elliptical galaxies and spir ...
... nucleus of our Galaxy, and what is the probable explanation? 7. Describe the factors involved in galactic formation, including the role of collisions between galaxies. 8. Be able to identify a galaxy by its shape, according to the Hubble sequence. 9. Compare and contrast elliptical galaxies and spir ...
the evolutionary radial distributions of h2 density within spiral and
... galaxies and those which are massive but with low starforming efficiencies are still producing molecular gas. However, the most massive galaxies most efficient in forming stars, consume very quickly the molecular gas. The magenta crosses are those of Bertram et al. (2005) for nearby QSO´s. The prese ...
... galaxies and those which are massive but with low starforming efficiencies are still producing molecular gas. However, the most massive galaxies most efficient in forming stars, consume very quickly the molecular gas. The magenta crosses are those of Bertram et al. (2005) for nearby QSO´s. The prese ...
DoE LPPC 2006
... Parallel Imager for Southern Cosmological Observations Dedicated camera to measure redshift of high-z clusters Field of view matched to size of high redshift clusters: 5’ = 1 Mpc at z = ½, clusters are 1-10 Mpc across Highest possible efficiency broadband photometer: 4 simultaneous bands ...
... Parallel Imager for Southern Cosmological Observations Dedicated camera to measure redshift of high-z clusters Field of view matched to size of high redshift clusters: 5’ = 1 Mpc at z = ½, clusters are 1-10 Mpc across Highest possible efficiency broadband photometer: 4 simultaneous bands ...
Understanding the Astrophysics of Galaxy Evolution: the role of
... The reason is very simple. As we push out to redshifts z ∼ 2 when typical spiral galaxies and ellipticals were in their most active formation phase, optical spectra sample the rest-frame ultraviolet part of the galaxy SED which is dominated by light from the most massive, short-lived stars. There ar ...
... The reason is very simple. As we push out to redshifts z ∼ 2 when typical spiral galaxies and ellipticals were in their most active formation phase, optical spectra sample the rest-frame ultraviolet part of the galaxy SED which is dominated by light from the most massive, short-lived stars. There ar ...
G. Kacprzak "Galaxy-halo and gas connection 0.5 email
... Halo gas is “aware” of the kinematics of the galaxy (pilot study 5 galaxies). ...
... Halo gas is “aware” of the kinematics of the galaxy (pilot study 5 galaxies). ...
Hubble Deep Field Image
... Northern Hemisphere; more specifically: a small section which lies within the Ursa Major constellation. Field was selected by the following criteria Needed to be outside of the Milky Way’s disk of dust Could not contain very bright objects or anything that emitted too much infrared, x-ray, or ...
... Northern Hemisphere; more specifically: a small section which lies within the Ursa Major constellation. Field was selected by the following criteria Needed to be outside of the Milky Way’s disk of dust Could not contain very bright objects or anything that emitted too much infrared, x-ray, or ...
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).