Long Ago and Far Away
... allowing us to see faint infrared-emitting objects at the same level of detail that HST provides in visible light. 1.The galaxy (or merging pair) on page 1 with recession velocity 0.058 LY/yr is a rare example of a fairly nearby “ultraluminous infrared galaxy,” which is experiencing a starburst as i ...
... allowing us to see faint infrared-emitting objects at the same level of detail that HST provides in visible light. 1.The galaxy (or merging pair) on page 1 with recession velocity 0.058 LY/yr is a rare example of a fairly nearby “ultraluminous infrared galaxy,” which is experiencing a starburst as i ...
Chapter 3 Cosmology 3.1 The Doppler effect
... by the unaided eye on a clear night. By taking photographs of Andromeda using a large telescope, Edwin Hubble was able to identify Cepheid variable stars in Andromeda. These stars vary in brightness with a period of the order of days and are named after the first one to be discovered, -Cephei, the ...
... by the unaided eye on a clear night. By taking photographs of Andromeda using a large telescope, Edwin Hubble was able to identify Cepheid variable stars in Andromeda. These stars vary in brightness with a period of the order of days and are named after the first one to be discovered, -Cephei, the ...
The Superhero's Universe: Observing the Cosmos with X-ray Vision and Beyond
... ★ 6500 light years away ★ Expanding at 1,500 kilometers per second ...
... ★ 6500 light years away ★ Expanding at 1,500 kilometers per second ...
Lecture ? Einstein-Debye theory
... For a macroscopic crystal, the spectrum of sound waves is almost continuous, and we can treat is a continuous variable. As in the case of photons, we start with the density of states per unit frequency g(). The number of modes per unit volume with the wave number < k: k3 - multiplied by 3 since a ...
... For a macroscopic crystal, the spectrum of sound waves is almost continuous, and we can treat is a continuous variable. As in the case of photons, we start with the density of states per unit frequency g(). The number of modes per unit volume with the wave number < k: k3 - multiplied by 3 since a ...
presentation source
... Radio Image of M81 and its satellite M82. The image reveals the lanes of Hydrogen gas between these galaxies ...
... Radio Image of M81 and its satellite M82. The image reveals the lanes of Hydrogen gas between these galaxies ...
Rhodri Evans - LA Flood Project
... call the “cosmic microwave background radiation”. This radiation was finally discovered in 1964, and since then advances in both theory and observations (such as the BICEP2 experiment mentioned above) now allow us to argue that we understand the physics of the Universe back to the briefest fraction ...
... call the “cosmic microwave background radiation”. This radiation was finally discovered in 1964, and since then advances in both theory and observations (such as the BICEP2 experiment mentioned above) now allow us to argue that we understand the physics of the Universe back to the briefest fraction ...
file - University of California San Diego
... "So we want to know, how much helium is left in intergalactic space? In quasars? What was the primordial amount?" Looking at a quasar with a redshift of four, for instance, corresponds to looking back 10 billion years in time to the period shortly after the Big Bang. 3. The spectra of intermediate r ...
... "So we want to know, how much helium is left in intergalactic space? In quasars? What was the primordial amount?" Looking at a quasar with a redshift of four, for instance, corresponds to looking back 10 billion years in time to the period shortly after the Big Bang. 3. The spectra of intermediate r ...
Lecture1-1
... Estimated amount of dust reddening as a function of z-band absolute magnitude and Dn(4000). The colors of model SEDs (blue dots) and observed galaxies (black dots). Left panels shows the colors without emission line correction and right panels with emission line correction ...
... Estimated amount of dust reddening as a function of z-band absolute magnitude and Dn(4000). The colors of model SEDs (blue dots) and observed galaxies (black dots). Left panels shows the colors without emission line correction and right panels with emission line correction ...
Galaxies and the Universe
... Expansion of the Universe • Is the redshift measured an indication of actual velocity? Not necessarily… • Einstein’s explanation was that space itself expands, carrying galaxies with it… • As space expands, light that is travelling through space also expands… – The wavelength gets longer the more t ...
... Expansion of the Universe • Is the redshift measured an indication of actual velocity? Not necessarily… • Einstein’s explanation was that space itself expands, carrying galaxies with it… • As space expands, light that is travelling through space also expands… – The wavelength gets longer the more t ...
Big Bang and Beyond
... • Many more amazing “coincidences” that make life possible have been discovered – The composition of our sun is just right, the distance of the Earth to the sun is just right, the size of the Earth is just right, the orbit of the Earth is just right, the size of our moon is just right and even the g ...
... • Many more amazing “coincidences” that make life possible have been discovered – The composition of our sun is just right, the distance of the Earth to the sun is just right, the size of the Earth is just right, the orbit of the Earth is just right, the size of our moon is just right and even the g ...
Apparent versus Event Horizon
... up by a star and the core collapses. How far it collapses, into what kind of object, and at what rate, is determined by the star's final mass and the remaining outward pressure that the burnt-up nuclear residue (largely iron) can muster. If the star is sufficiently massive or compressible, it may co ...
... up by a star and the core collapses. How far it collapses, into what kind of object, and at what rate, is determined by the star's final mass and the remaining outward pressure that the burnt-up nuclear residue (largely iron) can muster. If the star is sufficiently massive or compressible, it may co ...
Topic 6 Introduction
... – Typical kinetic energy release: 1044 J – Typical total energy release: 1046 J (100x that of the Sun for 10 billion years) – Temporarily outshine an entire galaxy (magnitude -19 to ...
... – Typical kinetic energy release: 1044 J – Typical total energy release: 1046 J (100x that of the Sun for 10 billion years) – Temporarily outshine an entire galaxy (magnitude -19 to ...
Lambda-CDM model
The ΛCDM (Lambda cold dark matter) or Lambda-CDM model is a parametrization of the Big Bang cosmological model in which the universe contains a cosmological constant, denoted by Lambda (Greek Λ), associated with dark energy, and cold dark matter (abbreviated CDM). It is frequently referred to as the standard model of Big Bang cosmology, because it is the simplest model that provides a reasonably good account of the following properties of the cosmos: the existence and structure of the cosmic microwave background the large-scale structure in the distribution of galaxies the abundances of hydrogen (including deuterium), helium, and lithium the accelerating expansion of the universe observed in the light from distant galaxies and supernovaeThe model assumes that general relativity is the correct theory of gravity on cosmological scales.It emerged in the late 1990s as a concordance cosmology, after a period of time when disparate observed properties of the universe appeared mutually inconsistent, and there was no consensus on the makeup of the energy density of the universe.The ΛCDM model can be extended by adding cosmological inflation, quintessence and other elements that are current areas of speculation and research in cosmology.Some alternative models challenge the assumptions of the ΛCDM model. Examples of these are modified Newtonian dynamics, modified gravity and theories of large-scale variations in the matter density of the universe.