![Slides from the fourth lecture](http://s1.studyres.com/store/data/008082647_1-3cd7e33e827b8ae9973c8dff7da073cd-300x300.png)
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... about astronomical objects as disconnected elements, rather than an integrated system. This demonstration takes visitors from our Solar System, the part of the universe with which they are most familiar, outward to our Sun’s stellar neighbors, the other stars in our Milky Way galaxy, and into the un ...
... about astronomical objects as disconnected elements, rather than an integrated system. This demonstration takes visitors from our Solar System, the part of the universe with which they are most familiar, outward to our Sun’s stellar neighbors, the other stars in our Milky Way galaxy, and into the un ...
Cepheid Calibration
... candle—a class of sources that vary in apparent brightness only due to changes in distance. For years after Leavitt’s discovery, astronomers could only use Cepheids as uncalibrated standard candles, because no Cepheid had been assigned an accurate distance until fairly recently. Even so, Cepheids we ...
... candle—a class of sources that vary in apparent brightness only due to changes in distance. For years after Leavitt’s discovery, astronomers could only use Cepheids as uncalibrated standard candles, because no Cepheid had been assigned an accurate distance until fairly recently. Even so, Cepheids we ...
Hubble Space Telescope Image
... call spiral galaxies were referred to as “spiral nebulae” and most astronomers believed them to be clouds of gas and stars associated with our own Milky Way. The breakthrough came in 1924 when Edwin Hubble was able to measure the distance to the “Great Nebula in Andromeda” (M 31, at right) and found ...
... call spiral galaxies were referred to as “spiral nebulae” and most astronomers believed them to be clouds of gas and stars associated with our own Milky Way. The breakthrough came in 1924 when Edwin Hubble was able to measure the distance to the “Great Nebula in Andromeda” (M 31, at right) and found ...
Our Galaxy -- The Milky Way PowerPoint
... – Gravitational bending of light has been observed • Tentatively, MACHOs account for < 40% of dark matter ...
... – Gravitational bending of light has been observed • Tentatively, MACHOs account for < 40% of dark matter ...
Lecture 22 - Cosmic distance scale
... Primary distance indicators Secondary and tertiary distance indicators Recession of galaxies Expansion of the Universe ...
... Primary distance indicators Secondary and tertiary distance indicators Recession of galaxies Expansion of the Universe ...
Probing the stability of superheavy dark matter particles with high
... body or a three body leptonic decay, we find that the dark matter lifetime must be longer than O(1026 − 1028 ) s for masses between 10 TeV and the Grand Unification scale. Finally, we also calculate, for concrete particle physics scenarios, the limits on the strength of the interactions that induce ...
... body or a three body leptonic decay, we find that the dark matter lifetime must be longer than O(1026 − 1028 ) s for masses between 10 TeV and the Grand Unification scale. Finally, we also calculate, for concrete particle physics scenarios, the limits on the strength of the interactions that induce ...
A marked correlation function for constraining
... puzzling aspects of our current cosmological model. Two classes of explanation have been investigated, one based on a modification of the contents of the Universe [1, 2] and one based on a modification of gravity (see e.g. Refs. [3–6] for recent reviews). At present there are no theoretically consis ...
... puzzling aspects of our current cosmological model. Two classes of explanation have been investigated, one based on a modification of the contents of the Universe [1, 2] and one based on a modification of gravity (see e.g. Refs. [3–6] for recent reviews). At present there are no theoretically consis ...
Topics in Early Universe Cosmology
... The study of the Early Universe raises some of the most fundamental questions in theoretical physics. This thesis explores three main aspects of early universe cosmology. The first part discusses alternatives to the Big Bang scenario which is the current paradigm of cosmology. Namely, it discusses b ...
... The study of the Early Universe raises some of the most fundamental questions in theoretical physics. This thesis explores three main aspects of early universe cosmology. The first part discusses alternatives to the Big Bang scenario which is the current paradigm of cosmology. Namely, it discusses b ...
The quest for the size of the universe in early relativistic cosmology
... the difficulty of obtaining values of the gravitational potentials (identified by the symbols gµν ) which at infinity were invariant for all transformations. Einstein disregarded local non-homogeneous distributions of matter (like stars and planets), and introduced in his model an extremely small de ...
... the difficulty of obtaining values of the gravitational potentials (identified by the symbols gµν ) which at infinity were invariant for all transformations. Einstein disregarded local non-homogeneous distributions of matter (like stars and planets), and introduced in his model an extremely small de ...
Chalmers Un
... • Since April 2014: Director of the Master’s program in Physics & Astronomy at Chalmers (MPPAS) and of the corresponding Master’s program in Physics at Gothenburg University (N2PHY). • Since 2012: Reviewer of postdoc applications in astrophysics to Nordita, Stockholm. • Since 2012: Member of the LOF ...
... • Since April 2014: Director of the Master’s program in Physics & Astronomy at Chalmers (MPPAS) and of the corresponding Master’s program in Physics at Gothenburg University (N2PHY). • Since 2012: Reviewer of postdoc applications in astrophysics to Nordita, Stockholm. • Since 2012: Member of the LOF ...
Astro 6590: Galaxies and the Universe Astro
... • Typical scales are: masses between 106 to 1012 M (1 solar mass is 2 x 1030 kg), and sizes ~ 1-100 kpc (1 pc = 3.1 x 1016 m). Galaxies that rotate have Prot ~ 10-100 Myr at about 100 km/s. The average separation of galaxies is about 1 Mpc. • Between galaxies there is very diffuse hot gas, called t ...
... • Typical scales are: masses between 106 to 1012 M (1 solar mass is 2 x 1030 kg), and sizes ~ 1-100 kpc (1 pc = 3.1 x 1016 m). Galaxies that rotate have Prot ~ 10-100 Myr at about 100 km/s. The average separation of galaxies is about 1 Mpc. • Between galaxies there is very diffuse hot gas, called t ...
AtheistPseudoScience.ppt - Heinz Lycklama`s Website
... “I describe the history of the development of the standard big bang cosmology and how it is understood in terms of its philosophical underpinnings. The Cosmological Principle is explained as the major and essential assumption upon which it all depends. Due to this it has been required to invent unkn ...
... “I describe the history of the development of the standard big bang cosmology and how it is understood in terms of its philosophical underpinnings. The Cosmological Principle is explained as the major and essential assumption upon which it all depends. Due to this it has been required to invent unkn ...
Word - The Open University
... decrease at later times. This contributes to the decrease in the value of the Hubble constant with time, and is due to the gravitational attraction between all the matter in the Universe. The effect is referred to as deceleration. The rate of cooling and expansion has changed somewhat since those ea ...
... decrease at later times. This contributes to the decrease in the value of the Hubble constant with time, and is due to the gravitational attraction between all the matter in the Universe. The effect is referred to as deceleration. The rate of cooling and expansion has changed somewhat since those ea ...
Chapter 34 Protons
... colors of the visible spectrum. Another difference is that the color of the light emitted by the filament changes as you change the temperature of the filament. If you turn on the light bulb slowly, you first see a dull red, then a brighter red, and finally the filament becomes white hot, emitting t ...
... colors of the visible spectrum. Another difference is that the color of the light emitted by the filament changes as you change the temperature of the filament. If you turn on the light bulb slowly, you first see a dull red, then a brighter red, and finally the filament becomes white hot, emitting t ...
2.3 Peculiar galaxies
... lines are very broad. This is due to our old friend the Doppler effect - the gas must be moving around as well as being ionised. If we measure the width of a line at wavelength we can calculate the typical gas velocity from v = c · / . The result is that typical AGN gas is moving at ⇠ 10,000 km s 1 ...
... lines are very broad. This is due to our old friend the Doppler effect - the gas must be moving around as well as being ionised. If we measure the width of a line at wavelength we can calculate the typical gas velocity from v = c · / . The result is that typical AGN gas is moving at ⇠ 10,000 km s 1 ...
Molecular gas in the host galaxy of a quasar at redshift z 5 6.42
... quoted above becomes an upper limit (resulting in a longer gas depletion timescale). The FIR continuum-to-CO line ratio for J1148 þ 5251 is large, 440 (in L ( (K km s21 pc2)21), which is an order of magnitude larger than for normal star-forming galaxies15 (5–50), but is comparable to that seen in UL ...
... quoted above becomes an upper limit (resulting in a longer gas depletion timescale). The FIR continuum-to-CO line ratio for J1148 þ 5251 is large, 440 (in L ( (K km s21 pc2)21), which is an order of magnitude larger than for normal star-forming galaxies15 (5–50), but is comparable to that seen in UL ...
Galaxies - SD43 Teacher Sites
... an orange inserted into its centre. The central bulge is made up of stars that formed long ago. The disk circling it is made of gas, dust, and newly forming stars. The glow that surrounds the whole structure is called the halo (Figure 10.12). The Milky Way is a spiral galaxy. When we see that long b ...
... an orange inserted into its centre. The central bulge is made up of stars that formed long ago. The disk circling it is made of gas, dust, and newly forming stars. The glow that surrounds the whole structure is called the halo (Figure 10.12). The Milky Way is a spiral galaxy. When we see that long b ...
Quasar Formation and Energy Emission in Black Hole Universe
... black holes were formed when the universe was merely 1-2 billion years after the big bang had taken place [5, 21]. How the supermassive black holes with billions of solar masses were formed so rapidly during the early universe is a great mystery raised by astronomers recently [22]. Theoretically, su ...
... black holes were formed when the universe was merely 1-2 billion years after the big bang had taken place [5, 21]. How the supermassive black holes with billions of solar masses were formed so rapidly during the early universe is a great mystery raised by astronomers recently [22]. Theoretically, su ...
Galaxies
... Distant Red Ellipticals • Observations of some distant red elliptical galaxies support the idea that most of their stars formed very early in the history of the universe ...
... Distant Red Ellipticals • Observations of some distant red elliptical galaxies support the idea that most of their stars formed very early in the history of the universe ...
Non-standard cosmology
![](https://commons.wikimedia.org/wiki/Special:FilePath/WMAP2.jpg?width=300)
A non-standard cosmology is any physical cosmological model of the universe that has been, or still is, proposed as an alternative to the Big Bang model of standard physical cosmology. In the history of cosmology, various scientists and researchers have disputed parts or all of the Big Bang due to a rejection or addition of fundamental assumptions needed to develop a theoretical model of the universe. From the 1940s to the 1960s, the astrophysical community was equally divided between supporters of the Big Bang theory and supporters of a rival steady state universe. It was not until advances in observational cosmology in the late 1960s that the Big Bang would eventually become the dominant theory, and today there are few active researchers who dispute it.The term non-standard is applied to any cosmological theory that does not conform to the scientific consensus, but is not used in describing alternative models where no consensus has been reached, and is also used to describe theories that accept a ""big bang"" occurred but differ as to the detailed physics of the origin and evolution of the universe. Because the term depends on the prevailing consensus, the meaning of the term changes over time. For example, hot dark matter would not have been considered non-standard in 1990, but would be in 2010. Conversely, a non-zero cosmological constant resulting in an accelerating universe would have been considered non-standard in 1990, but is part of the standard cosmology in 2010.