The Milky Way and Dark Matter
... 4. What observations have provided evidence that dark matter is present in spiral galaxies? 5. What kinds of objects have scientists eliminated as possible candidates for dark matter? 6. What are these things called WIMPs? Reinforcing Activity We will now do a demonstration to show how this works. M ...
... 4. What observations have provided evidence that dark matter is present in spiral galaxies? 5. What kinds of objects have scientists eliminated as possible candidates for dark matter? 6. What are these things called WIMPs? Reinforcing Activity We will now do a demonstration to show how this works. M ...
The 2dF QSO Redshift Survey
... QSO BH masses appear to drop towards lower redshift! (“Downsizing”) However… Direct imaging host galaxies do not appear any larger at high redshift (e.g. Croom et al 2004) ...
... QSO BH masses appear to drop towards lower redshift! (“Downsizing”) However… Direct imaging host galaxies do not appear any larger at high redshift (e.g. Croom et al 2004) ...
Twitter Feed ITSO Symposium 2017
... form most of the stars seen in disk galaxies today. Spectra of DLAs in QSO sightlines yield a wealth of information, such as their chemical abundances, ionisation states, and gas kinematics. However, because QSOs only probe a small fraction of a pc^2 of the absorbers, the two fundamental properties ...
... form most of the stars seen in disk galaxies today. Spectra of DLAs in QSO sightlines yield a wealth of information, such as their chemical abundances, ionisation states, and gas kinematics. However, because QSOs only probe a small fraction of a pc^2 of the absorbers, the two fundamental properties ...
An analogy
... – distant galaxies are younger than those used to define the Hubble Sequence – more peculiar galaxies are observed: could be due to patchy star formation (younger age) or to interactions being more frequent (denser Universe) – resolution is poor compared to local galaxies and usually limited to a fe ...
... – distant galaxies are younger than those used to define the Hubble Sequence – more peculiar galaxies are observed: could be due to patchy star formation (younger age) or to interactions being more frequent (denser Universe) – resolution is poor compared to local galaxies and usually limited to a fe ...
Galaxies
... galaxies, NGC4038 and NGC4039, are called “The Antennae”, because their long tails resemble the antennae of an insect. In our project, we write a computer program to simulate similar collisions. When two galaxies collide, in fact, the stars within them will just glide past one another without any p ...
... galaxies, NGC4038 and NGC4039, are called “The Antennae”, because their long tails resemble the antennae of an insect. In our project, we write a computer program to simulate similar collisions. When two galaxies collide, in fact, the stars within them will just glide past one another without any p ...
Word
... collisions between two circular galaxies, and each of them respectively consists of N and N1 “particles” which appear in the form of a dot in the animation programme. N and N1 can be adjusted. All of them have the same mass. The steps of the program is shown as follows: 1.) The positions of the cent ...
... collisions between two circular galaxies, and each of them respectively consists of N and N1 “particles” which appear in the form of a dot in the animation programme. N and N1 can be adjusted. All of them have the same mass. The steps of the program is shown as follows: 1.) The positions of the cent ...
UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to
... The proper motions of bright stars are based on about 140 catalogs,including Hipparcos and Tycho, as well as all catalogs used for the Tycho-2 proper motion construction. Proper motions of faint stars are based on re-reductions of early epoch SPM data (−90 to about −20 deg Dec) and NPM (PMM scans of ...
... The proper motions of bright stars are based on about 140 catalogs,including Hipparcos and Tycho, as well as all catalogs used for the Tycho-2 proper motion construction. Proper motions of faint stars are based on re-reductions of early epoch SPM data (−90 to about −20 deg Dec) and NPM (PMM scans of ...
Chapter 25 - Haiku Learning
... Red stars are much cooler, and most of their energy is emitted as longer-wavelength red light. Stars with temperatures between 5000 and 6000 K appear yellow, like the sun. ...
... Red stars are much cooler, and most of their energy is emitted as longer-wavelength red light. Stars with temperatures between 5000 and 6000 K appear yellow, like the sun. ...
Our Place in Space
... should print out the cards (preferably in color) and laminate them so that the information on each object appears on the reverse side of the image of that object. ...
... should print out the cards (preferably in color) and laminate them so that the information on each object appears on the reverse side of the image of that object. ...
1 A CLOSED NON-COLLAPSING 3-D UNIVERSE PREDICTING A
... recognition of a “power plant” that supports that activity. Could it be that there is a fundamental dynamic at work in our universe that we have not yet recognized and accounted for? It is well recognized that our two major theories, relativity and quantum theory, are not compatible. Limited to thre ...
... recognition of a “power plant” that supports that activity. Could it be that there is a fundamental dynamic at work in our universe that we have not yet recognized and accounted for? It is well recognized that our two major theories, relativity and quantum theory, are not compatible. Limited to thre ...
THE PRIMORDIAL HELIUM ABUNDANCE Manuel Peimbert
... The determination of YP is important for at least the following reasons: (a) it is one of the pillars of Big Bang cosmology and an accurate determination of YP permits to test the Standard Big Bang Nucleosynthesis (SBBN), (b) the models of stellar evolution require an accurate initial Y value; this ...
... The determination of YP is important for at least the following reasons: (a) it is one of the pillars of Big Bang cosmology and an accurate determination of YP permits to test the Standard Big Bang Nucleosynthesis (SBBN), (b) the models of stellar evolution require an accurate initial Y value; this ...
Particle Physics Matter, Energy, Space, Time
... Like a superconductor • In a superconductor, magnetic field gets repelled (Meißner effect), but penetrates only over “penetration length” Magnetic field is short-ranged! Imagine a physicist living in a superconductor • Finally figured: ...
... Like a superconductor • In a superconductor, magnetic field gets repelled (Meißner effect), but penetrates only over “penetration length” Magnetic field is short-ranged! Imagine a physicist living in a superconductor • Finally figured: ...
3. Cosmology and the Origin and Evolution of Galaxies
... devoted to studies of the formation and evolution of structure at highredshift, described in this chapter, are thus entirely consistent with this important strategic report from the CAA. Moreover, these important scientific questions are uniquely relevant, for the reasons described below, to astronom ...
... devoted to studies of the formation and evolution of structure at highredshift, described in this chapter, are thus entirely consistent with this important strategic report from the CAA. Moreover, these important scientific questions are uniquely relevant, for the reasons described below, to astronom ...
Particle Physics Matter, Energy, Space, Time
... Like a superconductor • In a superconductor, magnetic field gets repelled (Meißner effect), but penetrates only over “penetration length” Magnetic field is short-ranged! Imagine a physicist living in a superconductor • Finally figured: ...
... Like a superconductor • In a superconductor, magnetic field gets repelled (Meißner effect), but penetrates only over “penetration length” Magnetic field is short-ranged! Imagine a physicist living in a superconductor • Finally figured: ...
Measuring the Hubble Constant through Cepheid Distances
... Searching for Cepheids • Search target spiral galaxies in regions of active star-formation, but low in dustextinction • Observe with WFPC2 in V and I bands to correct for dust • Targeted 31 galaxies to find distance, calibrate secondary methods, and test effects of metallicity on PL relation ...
... Searching for Cepheids • Search target spiral galaxies in regions of active star-formation, but low in dustextinction • Observe with WFPC2 in V and I bands to correct for dust • Targeted 31 galaxies to find distance, calibrate secondary methods, and test effects of metallicity on PL relation ...
Quasars- The Brightest Black Holes
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
Galaxies
... • They often look like a star, due to their great distance (the rest of their galaxy structure can’t be seen). • Many quasars reveal more structure when viewed in radio wavelengths. ...
... • They often look like a star, due to their great distance (the rest of their galaxy structure can’t be seen). • Many quasars reveal more structure when viewed in radio wavelengths. ...
lecture24
... rushing away from us? No, we now understand that the universe as a whole is expanding so that every galaxy is receding from every other galaxy! For the most distant objects in the universe, we can use the Hubble expansion to estimate distance – measure the red shift to get the velocity of recession ...
... rushing away from us? No, we now understand that the universe as a whole is expanding so that every galaxy is receding from every other galaxy! For the most distant objects in the universe, we can use the Hubble expansion to estimate distance – measure the red shift to get the velocity of recession ...
J: Chapter 4: Stars and Galaxies
... The Sun’s Layers Within the universe, the Sun is an ordinary star—not too spectacular. However, to you it’s important. The Sun is the center of the solar system, and it makes life possible on Earth. More than 99 percent of all the matter in the solar system is in the Sun. Notice the different layers ...
... The Sun’s Layers Within the universe, the Sun is an ordinary star—not too spectacular. However, to you it’s important. The Sun is the center of the solar system, and it makes life possible on Earth. More than 99 percent of all the matter in the solar system is in the Sun. Notice the different layers ...
The fate of black hole singularities and the parameters of the
... Then we have the following picture. If we let P be the space of dimensionless parameters, p, then we can define an ensemble of universes by beginning with an initial value p∗ and letting the system evolve through N generations. Let us define a function B(p) on P that is the expected number of future ...
... Then we have the following picture. If we let P be the space of dimensionless parameters, p, then we can define an ensemble of universes by beginning with an initial value p∗ and letting the system evolve through N generations. Let us define a function B(p) on P that is the expected number of future ...
Galaxies - University of Iowa Astrophysics
... 1. Measure the distance to star A to be 200 pc. 2. Measure the flux of star A. 3. Measure the flux of star B, which is known to have the same luminosity as star A, to be lower by a factor of 1600 (or the flux of A is 1600 times the flux of B). 4. Find the distance to star B. ...
... 1. Measure the distance to star A to be 200 pc. 2. Measure the flux of star A. 3. Measure the flux of star B, which is known to have the same luminosity as star A, to be lower by a factor of 1600 (or the flux of A is 1600 times the flux of B). 4. Find the distance to star B. ...
Cosmology with objects from the Hamburg Quasar Surveys
... the most remarkable among the now 10 new discoveries from the HS and HE surveys. The flux ratios of the broad emission lines and of the continuum are different between images A and B, and the continuum flux ratios vary with wavelength, image A being distinctly bluer than A (1992). At that time we co ...
... the most remarkable among the now 10 new discoveries from the HS and HE surveys. The flux ratios of the broad emission lines and of the continuum are different between images A and B, and the continuum flux ratios vary with wavelength, image A being distinctly bluer than A (1992). At that time we co ...
Constraining the Topology of the Universe
... decreased for smaller circles. The pure Doppler terms are correlated for large circles ( > 45 ), and anticorrelated for small circles. The code was able to find all 101 predicted circle pairs with radii greater than 25 : The poorest detection had an Smax value of 0.45. While we only simulated a t ...
... decreased for smaller circles. The pure Doppler terms are correlated for large circles ( > 45 ), and anticorrelated for small circles. The code was able to find all 101 predicted circle pairs with radii greater than 25 : The poorest detection had an Smax value of 0.45. While we only simulated a t ...
“Here Comes the Sun” How the new
... the rest of the universe is not minuscule compared with that of the Sun, but significant. He confuses central forces, which act purely in the direction of the relevant mass, with off-centre forces which appear only in General Relativity where, in addition to the central attractive forces directly an ...
... the rest of the universe is not minuscule compared with that of the Sun, but significant. He confuses central forces, which act purely in the direction of the relevant mass, with off-centre forces which appear only in General Relativity where, in addition to the central attractive forces directly an ...
PDF - Oxford Academic - Oxford University Press
... overall structure of the universe and many finer details. For example, it predicts that the universe is expanding and that distant galaxies are receding from us at a speed that is approximately proportional to their distance. This has been amply confirmed by redshift measurements throughout the 20th ...
... overall structure of the universe and many finer details. For example, it predicts that the universe is expanding and that distant galaxies are receding from us at a speed that is approximately proportional to their distance. This has been amply confirmed by redshift measurements throughout the 20th ...
Chronology of the universe
The chronology of the universe describes the history and future of the universe according to Big Bang cosmology, the prevailing scientific model of how the universe developed over time from the Planck epoch, using the cosmological time parameter of comoving coordinates. The model of the universe's expansion is known as the Big Bang. As of 2015, this expansion is estimated to have begun 13.799 ± 0.021 billion years ago. It is convenient to divide the evolution of the universe so far into three phases.