Heyvaerts
... Neutrinos from AGN’s High energy photons from blazars only (jet-associated) CGRO 66 blazars at GeV’s. Leptonic Model : Origin in Inverse Compton of 100 TeV cosmic ray electron-positrons on optical UV photons, either self radiated by synchrotron or on ambiant photons from accretion disk There is a p ...
... Neutrinos from AGN’s High energy photons from blazars only (jet-associated) CGRO 66 blazars at GeV’s. Leptonic Model : Origin in Inverse Compton of 100 TeV cosmic ray electron-positrons on optical UV photons, either self radiated by synchrotron or on ambiant photons from accretion disk There is a p ...
Talk - Otterbein University
... • The more mass a galaxy has the brighter it is the faster it rotates the wider the spectral lines are • Measuring rotation speed allows us to estimate luminosity; comparing to observed (apparent) brightness then tells us the distance ...
... • The more mass a galaxy has the brighter it is the faster it rotates the wider the spectral lines are • Measuring rotation speed allows us to estimate luminosity; comparing to observed (apparent) brightness then tells us the distance ...
gravitational waves
... The Einstein curvature tensor “G” is mathematical object describing curvature of 4-D space-time. The Stress-Energy tensor “T” is mathematical object describing distribution of mass/energy. Newton’s constant of gravitation “G” and the speed of light “c” appear as fundamental constants in this equatio ...
... The Einstein curvature tensor “G” is mathematical object describing curvature of 4-D space-time. The Stress-Energy tensor “T” is mathematical object describing distribution of mass/energy. Newton’s constant of gravitation “G” and the speed of light “c” appear as fundamental constants in this equatio ...
HIERARCHICAL GALAXY ASSEMBLY AND ITS MANIFESTATIONS
... luminosity and colour like single stellar population models, with epoch of formation z~3-5: passive evolution Hierarchical semi-analytic models produce slower and more prolonged evolution, and lower masses at high redshift, ...
... luminosity and colour like single stellar population models, with epoch of formation z~3-5: passive evolution Hierarchical semi-analytic models produce slower and more prolonged evolution, and lower masses at high redshift, ...
Stellar Structure — Polytrope models for White Dwarf density profiles
... low in the outer atmosphere of the star. At some point ρ(r) will reach some low cutoff value and then we will say that that value of r is the radius of the star. The mass dnesity profile is calculated from two coupled differential equations. The first comes from conservation of mass. It is ...
... low in the outer atmosphere of the star. At some point ρ(r) will reach some low cutoff value and then we will say that that value of r is the radius of the star. The mass dnesity profile is calculated from two coupled differential equations. The first comes from conservation of mass. It is ...
Research proposal uploaded for ESO fellowship
... global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat supernova feedback, which are parametrized to reproduce the faint-end of the luminosity function (Cole et al. 2000; Guo et al. ...
... global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat supernova feedback, which are parametrized to reproduce the faint-end of the luminosity function (Cole et al. 2000; Guo et al. ...
General theory of relativity
... Syllabus --------------------------------------------------------------------------------------------------------------------Special theory of relativity. General theory of relativity. Friedmann universe models, Hubble constant, cosmological red shift Elementary particles and interactions. Modern co ...
... Syllabus --------------------------------------------------------------------------------------------------------------------Special theory of relativity. General theory of relativity. Friedmann universe models, Hubble constant, cosmological red shift Elementary particles and interactions. Modern co ...
June 2012 - smile2340
... there exists three states of matter (solid, liquid, gas). Some teachers may have even added plasma (example: lightning) making four states of matter. However, just like everyone thought infinity was infinity until Cantor proved there are actually an infinite number of infinities; there are actually ...
... there exists three states of matter (solid, liquid, gas). Some teachers may have even added plasma (example: lightning) making four states of matter. However, just like everyone thought infinity was infinity until Cantor proved there are actually an infinite number of infinities; there are actually ...
PowerPoint Presentation - Super Massive Black Holes
... as the object gets more massive, the force should get bigger too. But the force is also inversely proportional to the cube of the object's radius. As the hole gets more massive, its size increases, but because of the cube factor, the force decreases much faster than any possible mass increase can ac ...
... as the object gets more massive, the force should get bigger too. But the force is also inversely proportional to the cube of the object's radius. As the hole gets more massive, its size increases, but because of the cube factor, the force decreases much faster than any possible mass increase can ac ...
Astronomy 104: Homework Set 6 Due: Wednesday, April 1, 2015
... a) What is the distance to a galaxy with a recession velocity of 10,000 km/s for an assumed Hubble constant of 90 km/s/Mpc? b) You measure the distance to a galaxy to be 120 Mpc and its recession velocity is 6,600 km/s. What Hubble constant would you derive from this galaxy? c) What is the distance ...
... a) What is the distance to a galaxy with a recession velocity of 10,000 km/s for an assumed Hubble constant of 90 km/s/Mpc? b) You measure the distance to a galaxy to be 120 Mpc and its recession velocity is 6,600 km/s. What Hubble constant would you derive from this galaxy? c) What is the distance ...
Question paper - Unit 5 (6PH05) - January 2012
... 5 About 25% of the mass of our Universe is thought to consist of dark matter. A key property of dark matter is that it A absorbs all electromagnetic-radiation. B cannot be detected. C emits no detectable electromagnetic-radiation. D exerts no gravitational force. (Total for Question 5 = 1 mark) 6 Co ...
... 5 About 25% of the mass of our Universe is thought to consist of dark matter. A key property of dark matter is that it A absorbs all electromagnetic-radiation. B cannot be detected. C emits no detectable electromagnetic-radiation. D exerts no gravitational force. (Total for Question 5 = 1 mark) 6 Co ...
ISP 205: Visions of the Universe
... Earth orbits the Sun (revolves) once every year… • at an average distance of 1 AU ≈ 150 million km. • with Earth’s axis tilted by 23.5º (pointing to Polaris). • and rotates in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
... Earth orbits the Sun (revolves) once every year… • at an average distance of 1 AU ≈ 150 million km. • with Earth’s axis tilted by 23.5º (pointing to Polaris). • and rotates in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
Cosmology Handouts
... Rainbows reveal that white light is a combination of all the colours. In 1666, Isaac Newton showed that white light could be separated into its component colours using glass prisms. Soon scientists were using this new tool to analyze the light coming from several different light sources. Some scient ...
... Rainbows reveal that white light is a combination of all the colours. In 1666, Isaac Newton showed that white light could be separated into its component colours using glass prisms. Soon scientists were using this new tool to analyze the light coming from several different light sources. Some scient ...
AST1001.ch1
... Earth orbits the Sun (revolves) once every year… • at an average distance of 1 AU ≈ 150 million km. • with Earth’s axis tilted by 23.5º (pointing to Polaris). • and rotates in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
... Earth orbits the Sun (revolves) once every year… • at an average distance of 1 AU ≈ 150 million km. • with Earth’s axis tilted by 23.5º (pointing to Polaris). • and rotates in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
High School Science Essential Curriculum - Astronomy
... Demonstrate appropriate skills and techniques for using equipment for visual, binocular, and telescopic observations. b. ...
... Demonstrate appropriate skills and techniques for using equipment for visual, binocular, and telescopic observations. b. ...
A05715 ANY CALCULATOR Page 1 TURN OVER School of Physics
... Describe the lighthouse model for a pulsar, and indicate how the model is consistent with observations. ...
... Describe the lighthouse model for a pulsar, and indicate how the model is consistent with observations. ...
Linking Asteroids and Meteorites through Reflectance
... astronomers thought that the Milky Way Galaxy was the universe, and it measured only a few thousand light-years across. ...
... astronomers thought that the Milky Way Galaxy was the universe, and it measured only a few thousand light-years across. ...
Astronomy (stars, galaxies and the Universe)
... According to the Big Bang Theory, the Universe began to expand after an enormous explosion of concentrated matter and energy As it expanded, the Universe cooled Atoms formed after a few hundred million years The first stars and galaxies formed after about 200 million years ...
... According to the Big Bang Theory, the Universe began to expand after an enormous explosion of concentrated matter and energy As it expanded, the Universe cooled Atoms formed after a few hundred million years The first stars and galaxies formed after about 200 million years ...
What Do We Really Know About the Universe?
... extravagant promises of health and life, in spite of the tolerance of the scientific community for unsubstantiated just-so stories, because we have a prior commitment, a commitment to materialism. It is not that the methods and institutions of science somehow compel us to accept a material explanati ...
... extravagant promises of health and life, in spite of the tolerance of the scientific community for unsubstantiated just-so stories, because we have a prior commitment, a commitment to materialism. It is not that the methods and institutions of science somehow compel us to accept a material explanati ...
Modern physics topics 1 Physical data Constants: G = 6.67 x 10
... The age of the universe is proportional at H . Hence, if T = Ttoday / 4, then H = 4Htoday. If the age of the universe today is T, how old was the universe when its density was four times larger than it is today? (a) T/2 (b) T/4 (c) 4T (d) 2T (e) T/16 The age of the universe at any given time is prop ...
... The age of the universe is proportional at H . Hence, if T = Ttoday / 4, then H = 4Htoday. If the age of the universe today is T, how old was the universe when its density was four times larger than it is today? (a) T/2 (b) T/4 (c) 4T (d) 2T (e) T/16 The age of the universe at any given time is prop ...
Astronomy (stars, galaxies and the Universe)
... According to the Big Bang Theory , the Universe began to expand after an enormous explosion of concentrated matter and energy As it expanded, the Universe cooled Atoms formed after a few hundred million years The first stars and galaxies formed after about 200 million years ...
... According to the Big Bang Theory , the Universe began to expand after an enormous explosion of concentrated matter and energy As it expanded, the Universe cooled Atoms formed after a few hundred million years The first stars and galaxies formed after about 200 million years ...
Some Examples of Virtual Observatory Enabled Science What Are the Some Distinguishing
... Quasars and AGN • They are highly energetic manifestations in the nuclei of galaxies, believed to be powered by accretion onto massive black holes • Empirical classification schemes and various types have been developed, on the basis of the spectra; but recently, various unification schemes have be ...
... Quasars and AGN • They are highly energetic manifestations in the nuclei of galaxies, believed to be powered by accretion onto massive black holes • Empirical classification schemes and various types have been developed, on the basis of the spectra; but recently, various unification schemes have be ...
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.