Galaxies (Professor Powerpoint)
... Hubble Space Telescope image of nearly “empty” part of sky on 1/30 of the size of the moon. Over 1000 galaxies seen Likely around 100 billion galaxies in observable universe!!! ...
... Hubble Space Telescope image of nearly “empty” part of sky on 1/30 of the size of the moon. Over 1000 galaxies seen Likely around 100 billion galaxies in observable universe!!! ...
of satellite data, and associated opportunities for the LHC
... Gordy Kane May 2009 PAMELA Physics Workshop ...
... Gordy Kane May 2009 PAMELA Physics Workshop ...
Galaxies at High Redshift Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mauro Giavalisco
... extraordinarily smooth distribution of matter and energy by quantum physical processes during the first instant of existence of the universe. Today, the universe is highly inhomogeneous, with the matter organized in a hierarchy of structures such as stars, galaxies, clusters and superclusters of gal ...
... extraordinarily smooth distribution of matter and energy by quantum physical processes during the first instant of existence of the universe. Today, the universe is highly inhomogeneous, with the matter organized in a hierarchy of structures such as stars, galaxies, clusters and superclusters of gal ...
UNIT 4 - Galaxies XIV. The Milky Way A. Structure
... few million stars) dwarf ellipticals are far more numerous than giant ellipticals elliptical galaxies lack spiral arms contain little gas and thus have old, red, low-mass stars intermediate between ellipticals and spirals are galaxies with a flat disk, but no gas and no spiral arms ...
... few million stars) dwarf ellipticals are far more numerous than giant ellipticals elliptical galaxies lack spiral arms contain little gas and thus have old, red, low-mass stars intermediate between ellipticals and spirals are galaxies with a flat disk, but no gas and no spiral arms ...
Clusters of Galaxies
... Supernovae Type Ia (SN Ia) are “special”. They are probably white dwarf stars with a giant companion that is providing material to the white dwarf. Once the WD accretes a mass of 1.4 M⊙, it explodes as it becomes a neutron star. Because SN Ia all have a common progenitor, they likely have similar p ...
... Supernovae Type Ia (SN Ia) are “special”. They are probably white dwarf stars with a giant companion that is providing material to the white dwarf. Once the WD accretes a mass of 1.4 M⊙, it explodes as it becomes a neutron star. Because SN Ia all have a common progenitor, they likely have similar p ...
Evolutionary properties of galaxies and mass assembly up
... locally is already present at z ~ 1.2, the environmental dependency of the LF shape at high redshift appears to be different from what is seen at low redshift. Is this difference due to an increase with cosmic time of the number of faint red galaxies, developing a steep slope of LF of early type gal ...
... locally is already present at z ~ 1.2, the environmental dependency of the LF shape at high redshift appears to be different from what is seen at low redshift. Is this difference due to an increase with cosmic time of the number of faint red galaxies, developing a steep slope of LF of early type gal ...
A Novel Test of the Modified Newtonian Dynamics with Gas Rich
... The most serious observational problem facing MOND is the dynamics of rich clusters of galaxies. These appear to weigh more than can be accounted for with the observed baryons even with the modified dynamics [25, 26]. This residual mass discrepancy is roughly a factor of two in mass. On the one hand ...
... The most serious observational problem facing MOND is the dynamics of rich clusters of galaxies. These appear to weigh more than can be accounted for with the observed baryons even with the modified dynamics [25, 26]. This residual mass discrepancy is roughly a factor of two in mass. On the one hand ...
The quest for the size of the universe in early relativistic cosmology
... equations, formulated in 1917 by Einstein and by de Sitter, were the main focus of interest during the early phase of relativistic cosmology. These solutions represented by their intention a static universe with finite curvature radius. The Einstein universe was spherical and filled with matter, whe ...
... equations, formulated in 1917 by Einstein and by de Sitter, were the main focus of interest during the early phase of relativistic cosmology. These solutions represented by their intention a static universe with finite curvature radius. The Einstein universe was spherical and filled with matter, whe ...
A NEW METHOD FOR MEASURING EXTRAGALACTIC DISTANCES
... We have pioneered a new method for the measurement of extragalactic distances. This method uses the time lag between variations in the short wavelength and long wavelength light from an active galactic nucleus (AGN), based on a quantitative physical model of dust reverberation that relates the time ...
... We have pioneered a new method for the measurement of extragalactic distances. This method uses the time lag between variations in the short wavelength and long wavelength light from an active galactic nucleus (AGN), based on a quantitative physical model of dust reverberation that relates the time ...
Spacetime is a manifold that is continuous and differentiable
... with respect to P, then this corresponds to cos |~x| on the tangent plane. A series expansion ...
... with respect to P, then this corresponds to cos |~x| on the tangent plane. A series expansion ...
Chapter 17 - Astronomy
... by distances only about 20 times their diameter. On the other hand, stars in a galaxy rarely collide since they are separated by distances that are millions of time their diameter. 4. Because of their great distances, galaxies exhibit no proper motion. Evidence of past collisions has to come from pr ...
... by distances only about 20 times their diameter. On the other hand, stars in a galaxy rarely collide since they are separated by distances that are millions of time their diameter. 4. Because of their great distances, galaxies exhibit no proper motion. Evidence of past collisions has to come from pr ...
3. Cosmology and the Origin and Evolution of Galaxies
... to astronomy in general. Observational evidence suggests that much of the ongoing star formation in the universe takes place in the dusty, heavily obscured interstellar medium (ISM) in galaxies. This star formation activity can therefore be hidden from ultraviolet, optical, and infrared surveys. A m ...
... to astronomy in general. Observational evidence suggests that much of the ongoing star formation in the universe takes place in the dusty, heavily obscured interstellar medium (ISM) in galaxies. This star formation activity can therefore be hidden from ultraviolet, optical, and infrared surveys. A m ...
Presentation on the universe
... 5 Which best describes the Big Bang Theory? A The universe has always been the way it is today. B The universe began from a dying star C The universe was created by a singleexplosion The universe is full of explosions, or "big bangs," D that are making it expand ...
... 5 Which best describes the Big Bang Theory? A The universe has always been the way it is today. B The universe began from a dying star C The universe was created by a singleexplosion The universe is full of explosions, or "big bangs," D that are making it expand ...
6th Grade The Theoretical Beginning of the Universe / Big Bang
... Last year, you learned it is possible to estimate the distance a star is from Earth by looking at its brightness. Hubble used a number of methods to estimate how far away each star is. But he did much more. He used the color of each star's light to determine which direction they are moving...and how ...
... Last year, you learned it is possible to estimate the distance a star is from Earth by looking at its brightness. Hubble used a number of methods to estimate how far away each star is. But he did much more. He used the color of each star's light to determine which direction they are moving...and how ...
SPECTROSCOPY OF HIGH-REDSHIFT TYPE Ia SUPERNOVAE
... orthogonal direction to the flat universe line, and towards higher values of both Ω M and ΩΛ . This can readily be understood via a simple analogy: the matter term in the Friedmann equations acts like a “break” on the expansion, whereas the Λ term acts like an “accelerator”. One can imagine obtainin ...
... orthogonal direction to the flat universe line, and towards higher values of both Ω M and ΩΛ . This can readily be understood via a simple analogy: the matter term in the Friedmann equations acts like a “break” on the expansion, whereas the Λ term acts like an “accelerator”. One can imagine obtainin ...
Fuzzy Dark Matter
... rotation of galaxies in the 1970s, astronomer Vera Rubin realized that they don't move the way they "should" if only visible matter exists. Her discovery of the galaxy rotation problem provides some of the strongest evidence for dark matter's existence. Similarly, cosmic background radiation, which ...
... rotation of galaxies in the 1970s, astronomer Vera Rubin realized that they don't move the way they "should" if only visible matter exists. Her discovery of the galaxy rotation problem provides some of the strongest evidence for dark matter's existence. Similarly, cosmic background radiation, which ...
astro-ph/0311464 PDF
... Consider two coaxial buckets A and B rotating with equal and opposite angular velocities. One would observe the same concavity in the two buckets. The extension of Newton’s reasoning is straightforward and treats A and B equally and independently. A literal application of Mach’s Statement 1 would ha ...
... Consider two coaxial buckets A and B rotating with equal and opposite angular velocities. One would observe the same concavity in the two buckets. The extension of Newton’s reasoning is straightforward and treats A and B equally and independently. A literal application of Mach’s Statement 1 would ha ...
The MGC - St Andrews Astronomy Group
... – The Space Density of Galaxies Locally (M*, a, f*) • The Characteristic Luminosity • The Faint-end slope a j (M ) =Normalisation 0.9 ln 2.5j (*)10 ...
... – The Space Density of Galaxies Locally (M*, a, f*) • The Characteristic Luminosity • The Faint-end slope a j (M ) =Normalisation 0.9 ln 2.5j (*)10 ...
Cosmological dynamics with non-minimally coupled scalar field and
... such as the accelerated expansion of the universe, and that is why modifications of the theory of gravity are often employed as an alternative explanations. One should keep also in mind, that even though general relativity is very well tested in the weak field regime, the strong field remains essent ...
... such as the accelerated expansion of the universe, and that is why modifications of the theory of gravity are often employed as an alternative explanations. One should keep also in mind, that even though general relativity is very well tested in the weak field regime, the strong field remains essent ...
arXiv:astro-ph/9510089 v1 17 Oct 95
... Ω = 1 dark matter may not exist. This consideration is especially important when discussing dark matter detection, since detection is done in the Milky Way and its environs, and evidence for dark matter outside the Milky Way may not be relevant. So, let me start with an inventory of dark matter in t ...
... Ω = 1 dark matter may not exist. This consideration is especially important when discussing dark matter detection, since detection is done in the Milky Way and its environs, and evidence for dark matter outside the Milky Way may not be relevant. So, let me start with an inventory of dark matter in t ...
Harvesting ALFALFA: Discovering Galaxies in the Pisces
... PPS is the nearest supercluster to Milky Way Galaxy beyond Laniakea. (Tully et al., 2014) . We seek to explore the distribution and peculiar velocities of galaxies and clusters to determine the underlying distribution of dark matter in the large scale structures of the universe. PPS has been found t ...
... PPS is the nearest supercluster to Milky Way Galaxy beyond Laniakea. (Tully et al., 2014) . We seek to explore the distribution and peculiar velocities of galaxies and clusters to determine the underlying distribution of dark matter in the large scale structures of the universe. PPS has been found t ...
ppt - lenac
... Title Studying the low surface brightness galaxies from the SDSS With the advent of large aperture telescopes (VLT, Magellan, GEMINI, etc.) the detailed (high S/N spectroscopy, high spatial resolution, etc.) study of low surface brightness galaxies (LSBGs) become possible. These low stellar density ...
... Title Studying the low surface brightness galaxies from the SDSS With the advent of large aperture telescopes (VLT, Magellan, GEMINI, etc.) the detailed (high S/N spectroscopy, high spatial resolution, etc.) study of low surface brightness galaxies (LSBGs) become possible. These low stellar density ...
Dark Matter: A Brief Review
... This candidate class has the additional feature that it may “naturally” make up all the dark matter, thus making it more “Black Friday sale” dark matter than the “buy one, get one free” candidate. This feature of WIMPs is called the “WIMP miracle”. The origin of the WIMP miracle is this. If WIMPs ar ...
... This candidate class has the additional feature that it may “naturally” make up all the dark matter, thus making it more “Black Friday sale” dark matter than the “buy one, get one free” candidate. This feature of WIMPs is called the “WIMP miracle”. The origin of the WIMP miracle is this. If WIMPs ar ...
A Brief History of Time
... of fluctuations in the cosmic microwave background radiation by COBE (the Cosmic Background Explorer satellite) and other collaborations. These fluctuations are the finger-prints of creation, tiny initial irregularities in the otherwise smooth and uniform early universe that later grew into galaxies ...
... of fluctuations in the cosmic microwave background radiation by COBE (the Cosmic Background Explorer satellite) and other collaborations. These fluctuations are the finger-prints of creation, tiny initial irregularities in the otherwise smooth and uniform early universe that later grew into galaxies ...
Cosmological Implications of Trace
... Matter dominates over antimatter in our local universe. Several lines of evidence suggest that the region illuminated by the Big Bang (e.g. the “Universe”) is also strongly matter dominated. In spite of the ∼ 1836 times larger mass of the positive charge carrying proton than its negative charge carr ...
... Matter dominates over antimatter in our local universe. Several lines of evidence suggest that the region illuminated by the Big Bang (e.g. the “Universe”) is also strongly matter dominated. In spite of the ∼ 1836 times larger mass of the positive charge carrying proton than its negative charge carr ...
Big Bang
The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. The model accounts for the fact that the universe expanded from a very high density and high temperature state, and offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background, large scale structure, and Hubble's Law. If the known laws of physics are extrapolated beyond where they are valid, there is a singularity. Modern measurements place this moment at approximately 13.8 billion years ago, which is thus considered the age of the universe. After the initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars and galaxies.Since Georges Lemaître first noted, in 1927, that an expanding universe might be traced back in time to an originating single point, scientists have built on his idea of cosmic expansion. While the scientific community was once divided between supporters of two different expanding universe theories, the Big Bang and the Steady State theory, accumulated empirical evidence provides strong support for the former. In 1929, from analysis of galactic redshifts, Edwin Hubble concluded that galaxies are drifting apart, important observational evidence consistent with the hypothesis of an expanding universe. In 1965, the cosmic microwave background radiation was discovered, which was crucial evidence in favor of the Big Bang model, since that theory predicted the existence of background radiation throughout the universe before it was discovered. More recently, measurements of the redshifts of supernovae indicate that the expansion of the universe is accelerating, an observation attributed to dark energy's existence. The known physical laws of nature can be used to calculate the characteristics of the universe in detail back in time to an initial state of extreme density and temperature.