Quasars
... lot of ultraviolet excess. • One of them, 3C273 had its position very accurately measured by C. Hazard and co-workers, using lunar occultations. • In 1962, M. Schmidt obtained a spectrum of this “object", which showed a large redshift of 0.158, indicative of being very far away according to Hubble‟s ...
... lot of ultraviolet excess. • One of them, 3C273 had its position very accurately measured by C. Hazard and co-workers, using lunar occultations. • In 1962, M. Schmidt obtained a spectrum of this “object", which showed a large redshift of 0.158, indicative of being very far away according to Hubble‟s ...
File - Mr. Catt`s Class
... 11. A supercluster is a group of clusters of galaxies. Our local supercluster contains the local group and the Virgo cluster. Between superclusters are great voids with no galaxies. 12. It seems that matter in the universe forms a cosmic web in which galaxies are formed along filaments of normal and ...
... 11. A supercluster is a group of clusters of galaxies. Our local supercluster contains the local group and the Virgo cluster. Between superclusters are great voids with no galaxies. 12. It seems that matter in the universe forms a cosmic web in which galaxies are formed along filaments of normal and ...
Doppler Effect Demo
... that are close to the Milky Way actually move toward us and are blue-shifted. However, all galaxies beyond a certain distance are red-shifted. Is it possible to see any planets orbiting other stars? As of the time of this writing (August 2002) no planets have been directly observed. Most extra-solar ...
... that are close to the Milky Way actually move toward us and are blue-shifted. However, all galaxies beyond a certain distance are red-shifted. Is it possible to see any planets orbiting other stars? As of the time of this writing (August 2002) no planets have been directly observed. Most extra-solar ...
Elliptical Galaxies
... After these simple types of galaxies the diagram splits into two. On the upper branch are the S0 galaxies first - called lenticular galaxies because they are shaped like a lens in a magnfiying glass. The description is made up of the "S", meaning lenticular, the "0", meaning no arms, and the subscr ...
... After these simple types of galaxies the diagram splits into two. On the upper branch are the S0 galaxies first - called lenticular galaxies because they are shaped like a lens in a magnfiying glass. The description is made up of the "S", meaning lenticular, the "0", meaning no arms, and the subscr ...
1. This question is about some of the properties of Barnard`s star
... spectrum and temperature of a certain star are used to determine its luminosity to be approximately 5.0 1031 W. The apparent brightness of the star is 1.4 10–9 W m–2. These data can be used to determine the distance of the star from Earth. (i) ...
... spectrum and temperature of a certain star are used to determine its luminosity to be approximately 5.0 1031 W. The apparent brightness of the star is 1.4 10–9 W m–2. These data can be used to determine the distance of the star from Earth. (i) ...
HON 392 - Chapman University
... rotating, revolving planet which along with 5 other planets (ever growing in number) revolve around the Sun which is now revealed as being a “star.” There will be ever more and more stars discovered in this new very much larger space-volume, this container, our Milky Way Galaxy. In fact space has be ...
... rotating, revolving planet which along with 5 other planets (ever growing in number) revolve around the Sun which is now revealed as being a “star.” There will be ever more and more stars discovered in this new very much larger space-volume, this container, our Milky Way Galaxy. In fact space has be ...
attached file
... and finite in extent; it can be "negatively" curved like a saddle and infinite in extent; or it can be "flat" and infinite in extent - our "ordinary" conception of space. A key limitation of the picture shown here is that we can only portray the curvature of a 2-dimensional plane of an actual 3-dime ...
... and finite in extent; it can be "negatively" curved like a saddle and infinite in extent; or it can be "flat" and infinite in extent - our "ordinary" conception of space. A key limitation of the picture shown here is that we can only portray the curvature of a 2-dimensional plane of an actual 3-dime ...
An introduce of the spectrograph of the GALEX
... (...) The data show a compellingly consistent picture of the SFH out to redshift z~6, with especially tight constraints for z<~1. We fit these data with simple analytical forms and derive conservative uncertainties. Since the z<~1 SFH data are quite precise, we investigate the sequence of assumption ...
... (...) The data show a compellingly consistent picture of the SFH out to redshift z~6, with especially tight constraints for z<~1. We fit these data with simple analytical forms and derive conservative uncertainties. Since the z<~1 SFH data are quite precise, we investigate the sequence of assumption ...
Galaxy Questions Info
... containing spiral arms, and a halo. Elliptical galaxies have a bulgeshape and a halo, but do not have a disk. Bulge — A round structure made primarily of old stars, gas, and dust. The bulge of the Milky Way is roughly 10,000 light-years across. The outer parts of the bulge are difficult to distingui ...
... containing spiral arms, and a halo. Elliptical galaxies have a bulgeshape and a halo, but do not have a disk. Bulge — A round structure made primarily of old stars, gas, and dust. The bulge of the Milky Way is roughly 10,000 light-years across. The outer parts of the bulge are difficult to distingui ...
Understanding the Astrophysics of Galaxy Evolution: the role of
... Lyman break technique is extremely powerful, it does not pick up all high redshift galaxies. Franx and his collaborators found a significant population of very red galaxies (DRGs) that did not satisfy the LBG colour selection. Some are red because they were dusty, but a significant fraction are red ...
... Lyman break technique is extremely powerful, it does not pick up all high redshift galaxies. Franx and his collaborators found a significant population of very red galaxies (DRGs) that did not satisfy the LBG colour selection. Some are red because they were dusty, but a significant fraction are red ...
Twitter Feed ITSO Symposium 2017
... process? Spectroscopy of sources during reionisation can provide insights into this period, by setting constraints on the evolution of the neutral gas fraction with redshift, and on the topology of hydrogen reionisation. As they are extremely faint and their spectra are highly redshifted to near-inf ...
... process? Spectroscopy of sources during reionisation can provide insights into this period, by setting constraints on the evolution of the neutral gas fraction with redshift, and on the topology of hydrogen reionisation. As they are extremely faint and their spectra are highly redshifted to near-inf ...
22_Testbank
... Lost in Spacetime. Just when you thought it was safe to take final exams . . . a vindictive multidimensional being reaches down (up? over? through?) to Earth and pulls you out of the universe. You are thrown back into the universe at a place of this being's choosing, and she permits you to leave onl ...
... Lost in Spacetime. Just when you thought it was safe to take final exams . . . a vindictive multidimensional being reaches down (up? over? through?) to Earth and pulls you out of the universe. You are thrown back into the universe at a place of this being's choosing, and she permits you to leave onl ...
Slide 1
... • A "true" color image or photograph recreates what our eyes would see in visible light under natural conditions • To create a color image from data at other wavelengths, astronomers represent it in "false" colors • Three of grayscale images from different wavelengths may be mapped to red, green, an ...
... • A "true" color image or photograph recreates what our eyes would see in visible light under natural conditions • To create a color image from data at other wavelengths, astronomers represent it in "false" colors • Three of grayscale images from different wavelengths may be mapped to red, green, an ...
The Evolution of Galaxy - Tufts Institute of Cosmology
... of discovery in the study of clusters has accelerated over the past 40 years. Astronomers now know of some 10,000 of them. American astronomer George Abell compiled the first large list in the early 1950s, based on photographs of the entire northern sky taken at Palomar Observatory in California. By ...
... of discovery in the study of clusters has accelerated over the past 40 years. Astronomers now know of some 10,000 of them. American astronomer George Abell compiled the first large list in the early 1950s, based on photographs of the entire northern sky taken at Palomar Observatory in California. By ...
Dark Matter: Observational Constraints Properties of Dark Matter:
... • Hot, X-ray emitting gas is observed to be insufficient • Warm, 104 K ionized gas emits by bremstrahlung. If in hydrostatic equilibrium, central regions would be dense enough to be easily observed. • Molecular gas must be H2; large quantities would be ionized and observed near the galactic plane; i ...
... • Hot, X-ray emitting gas is observed to be insufficient • Warm, 104 K ionized gas emits by bremstrahlung. If in hydrostatic equilibrium, central regions would be dense enough to be easily observed. • Molecular gas must be H2; large quantities would be ionized and observed near the galactic plane; i ...
M104: The Sombrero Galaxy
... This photogenic galaxy looks like a broad-brimmed Mexican hat floating in space. Appropriately called the Sombrero Galaxy, its catalogue name is Messier 104 (M104). Thick dust lanes make up the brim of the galaxy. The brim winds into the brilliant white crown, made up of a central bulge of older sta ...
... This photogenic galaxy looks like a broad-brimmed Mexican hat floating in space. Appropriately called the Sombrero Galaxy, its catalogue name is Messier 104 (M104). Thick dust lanes make up the brim of the galaxy. The brim winds into the brilliant white crown, made up of a central bulge of older sta ...
The Dynamics of the Galaxies in the Local Group
... – Bright new regions of star formation appear, as gas gets compressed by the collision – Star formation ceases, as gas and dust are expelled – An elliptical light concentration remains on the night sky, having replaced today’s familiar Milky Way ...
... – Bright new regions of star formation appear, as gas gets compressed by the collision – Star formation ceases, as gas and dust are expelled – An elliptical light concentration remains on the night sky, having replaced today’s familiar Milky Way ...
4 Distances in Astronomy
... reliably. The best ground-based telescopes can achieve a resolution of about 0:500 , which can sometimes be reduced to about 0:0100 by averaging over many measurements. This corresponds to a distance of about 300 ly. Spacebased telescopes can do better (see the discussion of Hipparcos below), but so ...
... reliably. The best ground-based telescopes can achieve a resolution of about 0:500 , which can sometimes be reduced to about 0:0100 by averaging over many measurements. This corresponds to a distance of about 300 ly. Spacebased telescopes can do better (see the discussion of Hipparcos below), but so ...
M104: The Sombrero Galaxy
... This photogenic galaxy looks like a broad-brimmed Mexican hat floating in space. Appropriately called the Sombrero Galaxy, its catalogue name is Messier 104 (M104). Thick dust lanes make up the brim of the galaxy. The brim winds into the brilliant white crown, made up of a central bulge of older sta ...
... This photogenic galaxy looks like a broad-brimmed Mexican hat floating in space. Appropriately called the Sombrero Galaxy, its catalogue name is Messier 104 (M104). Thick dust lanes make up the brim of the galaxy. The brim winds into the brilliant white crown, made up of a central bulge of older sta ...
The Fundamental Plane, Stellar Popula6ons
... In terms of the fi7ed parameters of the FP itself, there appears to be no significant variaBon over the whole range in richness Next step: break these samples down further into age subsets, as there is evidence that age correlates with deviaBons from the FP ...
... In terms of the fi7ed parameters of the FP itself, there appears to be no significant variaBon over the whole range in richness Next step: break these samples down further into age subsets, as there is evidence that age correlates with deviaBons from the FP ...
Course 107: The Big Bang and the Anthropic Principle
... of the universe. It is another form of the cosmological argument. ○ Some things are caused. ○ Everything that is caused is caused by something else. ○ An infinite regress of causation is impossible. ○ Therefore, there must be an uncaused cause of all that is caused. ○ Christians believe this Uncause ...
... of the universe. It is another form of the cosmological argument. ○ Some things are caused. ○ Everything that is caused is caused by something else. ○ An infinite regress of causation is impossible. ○ Therefore, there must be an uncaused cause of all that is caused. ○ Christians believe this Uncause ...
Introduction
... to stars. These stars return much of their mass, often enriched in “metals” – elements heavier than H and He – to the interstellar medium (ISM). Stellar evolution also yields remnants which add to the dark matter content, and both stars and gas may be accreted by black holes. Galaxies are sometimes ...
... to stars. These stars return much of their mass, often enriched in “metals” – elements heavier than H and He – to the interstellar medium (ISM). Stellar evolution also yields remnants which add to the dark matter content, and both stars and gas may be accreted by black holes. Galaxies are sometimes ...
2.3 Peculiar galaxies
... source must be ionising local gas. However, in AGN, unlike in star formation regions, the emission 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 typ ...
... source must be ionising local gas. However, in AGN, unlike in star formation regions, the emission 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 typ ...
Observable universe
The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth at the present time because light and other signals from these objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer. Every location in the Universe has its own observable universe, which may or may not overlap with the one centered on Earth.The word observable used in this sense does not depend on whether modern technology actually permits detection of radiation from an object in this region (or indeed on whether there is any radiation to detect). It simply indicates that it is possible in principle for light or other signals from the object to reach an observer on Earth. In practice, we can see light only from as far back as the time of photon decoupling in the recombination epoch. That is when particles were first able to emit photons that were not quickly re-absorbed by other particles. Before then, the Universe was filled with a plasma that was opaque to photons.The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR). However, with future technology, it may be possible to observe the still older relic neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). According to calculations, the comoving distance (current proper distance) to particles from the CMBR, which represent the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light years), while the comoving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light years), about 2% larger.The best estimate of the age of the universe as of 2015 is 7010137990000000000♠13.799±0.021 billion years but due to the expansion of space humans are observing objects that were originally much closer but are now considerably farther away (as defined in terms of cosmological proper distance, which is equal to the comoving distance at the present time) than a static 13.8 billion light-years distance. It is estimated that the diameter of the observable universe is about 28 gigaparsecs (91 billion light-years, 8.8×1026 metres or 5.5×1023 miles), putting the edge of the observable universe at about 46–47 billion light-years away.