Disk Galaxies in the Magneticum Pathfinder Simulations
... axis of inertia of the stars within 0.1Rvir and subsequently classify it according to the circularity parameter ǫ = jz /jcirc , where jz is the specific angular momentum of each particle with respect to the z-axis and jcirc is the specific angular momentum expected for a circular orbit. We classify ...
... axis of inertia of the stars within 0.1Rvir and subsequently classify it according to the circularity parameter ǫ = jz /jcirc , where jz is the specific angular momentum of each particle with respect to the z-axis and jcirc is the specific angular momentum expected for a circular orbit. We classify ...
Dark Matter: Observational Constraints
... ρ(r) = 0.1 r -0.01 ± 0.12M~/pc3 • Even with no disk, dark halo density profile is ρ(r) = 1.2 r -0.27 ± 0.09 M~/pc3 ...
... ρ(r) = 0.1 r -0.01 ± 0.12M~/pc3 • Even with no disk, dark halo density profile is ρ(r) = 1.2 r -0.27 ± 0.09 M~/pc3 ...
Ultra-high-redshift galaxies from
... where supernova in small galaxies and active nuclei in the larger galaxies can quench star-formation and halt the growth of the galaxy. ...
... where supernova in small galaxies and active nuclei in the larger galaxies can quench star-formation and halt the growth of the galaxy. ...
Diapositiva 1 - Universidad de Guanajuato
... they refer primarily to intrinsic luminous galaxies, but there exists a large population of dwarf galaxies (van den Bergh, 1960) (as luminosity decreases, first the rings become invisible, then the spiral arms, and finally the bar and disc – dwarfs are more frequently E and Irr) the word “normal ...
... they refer primarily to intrinsic luminous galaxies, but there exists a large population of dwarf galaxies (van den Bergh, 1960) (as luminosity decreases, first the rings become invisible, then the spiral arms, and finally the bar and disc – dwarfs are more frequently E and Irr) the word “normal ...
Coma Cluster of Galaxies Activity
... — the Magellanic Clouds and Andromeda — all the way out to the edge of the visible universe 13 billion light years away. Nobody knows for sure, but it is estimated that there are 100 billion galaxies or more in the visible universe, and many more beyond that. Galaxies live in a variety of environmen ...
... — the Magellanic Clouds and Andromeda — all the way out to the edge of the visible universe 13 billion light years away. Nobody knows for sure, but it is estimated that there are 100 billion galaxies or more in the visible universe, and many more beyond that. Galaxies live in a variety of environmen ...
Dwarf Galaxies
... some may have had more recent (a few Gyr ago) weaker episodes of star formation •! Dwarf irregulars tend to have quasi-continuous star formation (perhaps interspersed with bursts). Lower luminosity dIrr’s more likely to have a bursty history •! Environmental effects may play a role (e.g., tidal stri ...
... some may have had more recent (a few Gyr ago) weaker episodes of star formation •! Dwarf irregulars tend to have quasi-continuous star formation (perhaps interspersed with bursts). Lower luminosity dIrr’s more likely to have a bursty history •! Environmental effects may play a role (e.g., tidal stri ...
powerpoint
... • In the centers of clusters you tend to find Giant Elliptical Galaxies that can be 10-100 times more massive than our galaxy. • Spirals tend to hang on their own – but often have small satellite galaxies. • The smallest galaxies are dwarf ellipticals. • Elliptical galaxies don’t have much dust or g ...
... • In the centers of clusters you tend to find Giant Elliptical Galaxies that can be 10-100 times more massive than our galaxy. • Spirals tend to hang on their own – but often have small satellite galaxies. • The smallest galaxies are dwarf ellipticals. • Elliptical galaxies don’t have much dust or g ...
Galaxies
... All stars you can see by eye or with small telescopes are in Milky Way ‣ as are stellar remains: white dwarfs, neutron stars, black holes and planetary nebulae ...
... All stars you can see by eye or with small telescopes are in Milky Way ‣ as are stellar remains: white dwarfs, neutron stars, black holes and planetary nebulae ...
galaxy
... • Irregular galaxies do not have a particular shape. The stars are randomly scattered. • Irregular galaxies have lots of gas and dust to form new stars. • About 20 percent of all galaxies are irregular. ...
... • Irregular galaxies do not have a particular shape. The stars are randomly scattered. • Irregular galaxies have lots of gas and dust to form new stars. • About 20 percent of all galaxies are irregular. ...
PH607lec12-3gal1
... Hubble distinguished different sub-classes according to the tightness of the arms and the size of the nucleus. He called these Sa, Sb, and Sc. ▪ Sa - tightly-wound, smooth arms, and a bright central ...
... Hubble distinguished different sub-classes according to the tightness of the arms and the size of the nucleus. He called these Sa, Sb, and Sc. ▪ Sa - tightly-wound, smooth arms, and a bright central ...
Galaxies and Their Properties
... • Hubble proposed a scheme for classifying galaxies (the “tuning fork” diagram) in his 1936 book, The Realm of the Nebulae ...
... • Hubble proposed a scheme for classifying galaxies (the “tuning fork” diagram) in his 1936 book, The Realm of the Nebulae ...
Galaxies - University of Iowa Astrophysics
... hidden mass in the galaxy? 1. cool clouds of hydrogen 2. RR Lyrae variable stars in globular clusters 3. flat rotation curve at large radii 4. dusty regions in the plane ...
... hidden mass in the galaxy? 1. cool clouds of hydrogen 2. RR Lyrae variable stars in globular clusters 3. flat rotation curve at large radii 4. dusty regions in the plane ...
Galaxy interactions - collisions Many stars are thrown out into space
... After a few billion years, when all has settled down, the result is an elliptical galaxy: Stars in random orbits, and little gas and dust left for new star formation. ...
... After a few billion years, when all has settled down, the result is an elliptical galaxy: Stars in random orbits, and little gas and dust left for new star formation. ...
A Universe of Galaxies
... Quasars: Fast, distant, and very bright Quasars have enormous redshifts, indicating that they are moving away from us at more than 90% of the speed of light. Objects moving that fast wouldn’t remain near us for long, so quasars must be very far away. If they can be seen even at such large distances ...
... Quasars: Fast, distant, and very bright Quasars have enormous redshifts, indicating that they are moving away from us at more than 90% of the speed of light. Objects moving that fast wouldn’t remain near us for long, so quasars must be very far away. If they can be seen even at such large distances ...
Galaxy Images - Institute of Physics
... which the galaxies reside (in the constellation Fornax), is just one-tenth the diameter of the full Moon (about the size of a grain of sand held at arms length) and is largely empty as seen with the naked eye. This is a "deep" core sample of the universe, cutting across billions of lightyears. The s ...
... which the galaxies reside (in the constellation Fornax), is just one-tenth the diameter of the full Moon (about the size of a grain of sand held at arms length) and is largely empty as seen with the naked eye. This is a "deep" core sample of the universe, cutting across billions of lightyears. The s ...
23.cosmology-student
... Jets of material shoot out from the poles of the system. A dense ring (torus) of dust blocks the center. What we see (quasar or radio galaxy) depends on the viewing angle. ...
... Jets of material shoot out from the poles of the system. A dense ring (torus) of dust blocks the center. What we see (quasar or radio galaxy) depends on the viewing angle. ...
Student Reading
... to distant Pluto in about five and a half hours. So the Sun and Earth are about eight “light-minutes” apart, and the Sun and Pluto are about five and a half “lighthours” apart. The closest star to the Sun is about four light-years away from it. Stars produce light and make their galaxy bright. Galax ...
... to distant Pluto in about five and a half hours. So the Sun and Earth are about eight “light-minutes” apart, and the Sun and Pluto are about five and a half “lighthours” apart. The closest star to the Sun is about four light-years away from it. Stars produce light and make their galaxy bright. Galax ...
Galactic Thin Disk - Caltech Astronomy
... There are two processes that may be responsible for this dynamical heating. The first, proposed by Spitzer and Schwarzschild in the 1950s, is by scattering of stellar orbits by encounters with large mass concentrations in the interstellar medium in the disks; these were later identified with the GMC ...
... There are two processes that may be responsible for this dynamical heating. The first, proposed by Spitzer and Schwarzschild in the 1950s, is by scattering of stellar orbits by encounters with large mass concentrations in the interstellar medium in the disks; these were later identified with the GMC ...
PX269 Galaxies - University of Warwick
... unfolding great and very wonderful sights and displaying to the gaze of everyone, but especially philosophers and astronomers, the things that were observed by GALILEO GALILEI, Florentine patrician and public mathematician of the University of Padua, with the help of a spyglass lately devised by him ...
... unfolding great and very wonderful sights and displaying to the gaze of everyone, but especially philosophers and astronomers, the things that were observed by GALILEO GALILEI, Florentine patrician and public mathematician of the University of Padua, with the help of a spyglass lately devised by him ...
Rich and Poor Galaxy Clusters
... – The Local Group is part of the Local Supercluster, shown at left. ...
... – The Local Group is part of the Local Supercluster, shown at left. ...
galaxy worksheet
... The biggest groups of stars in the universe are called galaxies. They may have a few million to more than a trillion stars. With the unaided eye, every star you can see is part of our own galaxy, the Milky Way Galaxy. All the other galaxies in the universe are extremely far away. The closest galaxy ...
... The biggest groups of stars in the universe are called galaxies. They may have a few million to more than a trillion stars. With the unaided eye, every star you can see is part of our own galaxy, the Milky Way Galaxy. All the other galaxies in the universe are extremely far away. The closest galaxy ...
Chapter14(11-18-10)
... What have we learned? • What clues to our galaxy’s history do halo stars hold? • The halo generally contains only old, low-mass stars with a much smaller proportion of heavy elements than stars in the disk. Thus, halo stars must have formed early in the galaxy’s history, before the gas settled into ...
... What have we learned? • What clues to our galaxy’s history do halo stars hold? • The halo generally contains only old, low-mass stars with a much smaller proportion of heavy elements than stars in the disk. Thus, halo stars must have formed early in the galaxy’s history, before the gas settled into ...
Milky Way
The Milky Way is the galaxy that contains our Solar System. Its name ""milky"" is derived from its appearance as a dim glowing band arching across the night sky whose individual stars cannot be distinguished by the naked eye. The term ""Milky Way"" is a translation of the Latin via lactea, from the Greek γαλαξίας κύκλος (galaxías kýklos, ""milky circle""). From Earth the Milky Way appears as a band because its disk-shaped structure is viewed from within. Galileo Galilei first resolved the band of light into individual stars with his telescope in 1610. Until the early 1920s most astronomers thought that the Milky Way contained all the stars in the Universe. Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Curtis, observations by Edwin Hubble showed that the Milky Way is just one of many galaxies—now known to number in the billions.The Milky Way is a barred spiral galaxy that has a diameter usually considered to be roughly 100,000–120,000 light-years but may be 150,000–180,000 light-years. The Milky Way is estimated to contain 100–400 billion stars, although this number may be as high as one trillion. There are probably at least 100 billion planets in the Milky Way. The Solar System is located within the disk, about 27,000 light-years from the Galactic Center, on the inner edge of one of the spiral-shaped concentrations of gas and dust called the Orion Arm. The stars in the inner ≈10,000 light-years form a bulge and one or more bars that radiate from the bulge. The very center is marked by an intense radio source, named Sagittarius A*, which is likely to be a supermassive black hole.Stars and gases at a wide range of distances from the Galactic Center orbit at approximately 220 kilometers per second. The constant rotation speed contradicts the laws of Keplerian dynamics and suggests that much of the mass of the Milky Way does not emit or absorb electromagnetic radiation. This mass has been given the name ""dark matter"". The rotational period is about 240 million years at the position of the Sun. The Milky Way as a whole is moving at a velocity of approximately 600 km per second with respect to extragalactic frames of reference. The oldest stars in the Milky Way are nearly as old as the Universe itself and thus must have formed shortly after the Big Bang.The Milky Way has several satellite galaxies and is part of the Local Group of galaxies, which is a component of the Virgo Supercluster, which again is a component of the Laniakea Supercluster.