PPT
... apparent magnitude of a Cepheid-type star and find its period. Read off the luminosity corresponding to this period. Calculate the distance. Cepheid variable stars with longer periods have greater luminosities. Edwin Hubble found Cepheid’s beyond the Milky Way in nearby galaxies. The Hubble Space Te ...
... apparent magnitude of a Cepheid-type star and find its period. Read off the luminosity corresponding to this period. Calculate the distance. Cepheid variable stars with longer periods have greater luminosities. Edwin Hubble found Cepheid’s beyond the Milky Way in nearby galaxies. The Hubble Space Te ...
Chapter 17
... 1. Do you think that our galaxy has ever been an active galaxy? Could it have hosted a quasar when it was young? 2. If a quasar is triggered in a galaxy’s core, what would it look like to people living in the outer disk of the galaxy? Could life continue in that galaxy? (Begin by deciding how bright ...
... 1. Do you think that our galaxy has ever been an active galaxy? Could it have hosted a quasar when it was young? 2. If a quasar is triggered in a galaxy’s core, what would it look like to people living in the outer disk of the galaxy? Could life continue in that galaxy? (Begin by deciding how bright ...
Observational Data
... star formation rate (>100Mo/yr), irregular and possibly merging-like morphologies, large masses, and strong redshift clustering, suggesting that they are massive early-type galaxies in the act of major assembly episodes. ...
... star formation rate (>100Mo/yr), irregular and possibly merging-like morphologies, large masses, and strong redshift clustering, suggesting that they are massive early-type galaxies in the act of major assembly episodes. ...
PDF
... What can have happened to these star-forming peculiars so that they were so numerous 5 billion years ago but virtually absent by the present epoch? Two hypotheses are popular. The first suggests that the peculiars are transformed via mergers or by other means into regular ellipticals and spirals. Th ...
... What can have happened to these star-forming peculiars so that they were so numerous 5 billion years ago but virtually absent by the present epoch? Two hypotheses are popular. The first suggests that the peculiars are transformed via mergers or by other means into regular ellipticals and spirals. Th ...
The Milky Way - The Independent School
... Neighboring Galaxies Some galaxies of our local group are difficult to observe because they are located behind the center of our Milky Way, from our view point. ...
... Neighboring Galaxies Some galaxies of our local group are difficult to observe because they are located behind the center of our Milky Way, from our view point. ...
GAIA A Stereoscopic Census of our Galaxy
... • Trojan companions of Mars, Earth and Venus • Edgeworth-Kuiper Belt objects: ~300 to 20 mag + binarity + Plutinos • Near-Earth Objects: – e.g. Amors, Apollos and Atens (442: 455: 75 known today) – ~1600 Earth-crossing asteroids > 1 km predicted (100 currently known) – GAIA detection: 260 - 590 m at ...
... • Trojan companions of Mars, Earth and Venus • Edgeworth-Kuiper Belt objects: ~300 to 20 mag + binarity + Plutinos • Near-Earth Objects: – e.g. Amors, Apollos and Atens (442: 455: 75 known today) – ~1600 Earth-crossing asteroids > 1 km predicted (100 currently known) – GAIA detection: 260 - 590 m at ...
Galaxy Spiral Arms
... This is actually the same Gravitation that Newton had quantified, but it is an entirely different perspective. Think of any galaxy spiral arm as a very large and massive “open cluster” of stars. We all accept that open clusters have a structural integrity due to mutual gravitation, even while revolv ...
... This is actually the same Gravitation that Newton had quantified, but it is an entirely different perspective. Think of any galaxy spiral arm as a very large and massive “open cluster” of stars. We all accept that open clusters have a structural integrity due to mutual gravitation, even while revolv ...
Populations of Galaxies and their Formation at z < 7
... integrated stellar mass in the universe increases gradually throughout this time suggesting that galaxy formation does not happen all at once. 3. Galaxies at high redshifts are peculiar and are likely undergoing mergers. The transition from mergers to normal Hubble types occurs at about z~1.5. Calcu ...
... integrated stellar mass in the universe increases gradually throughout this time suggesting that galaxy formation does not happen all at once. 3. Galaxies at high redshifts are peculiar and are likely undergoing mergers. The transition from mergers to normal Hubble types occurs at about z~1.5. Calcu ...
What Drives the Stellar Mass Growth of Early-Type
... We will build upon our expertise and existing toolkit to examine galaxies at an earlier epoch, providing rigorous, consistent, and minimally biased comparison samples for evaluating physical scenarios of galaxy formation and assembly. One fundamental aspect of this proposal is the major investment i ...
... We will build upon our expertise and existing toolkit to examine galaxies at an earlier epoch, providing rigorous, consistent, and minimally biased comparison samples for evaluating physical scenarios of galaxy formation and assembly. One fundamental aspect of this proposal is the major investment i ...
ACTIVE GALAXIES
... observations show us very distant galaxies as they were much earlier in time ...
... observations show us very distant galaxies as they were much earlier in time ...
Lecture notes 18: Galaxies and galaxy clusters
... Way were limited then perhaps the diffuse “elliptical nebulae” seen in the night sky may also be distant disklike systems similar to our own but seperate. Kant called these objects island universes. Charles Messier (1730–1817) compiled a list of 103 nebulae, many of these Messier Objects are indeed k ...
... Way were limited then perhaps the diffuse “elliptical nebulae” seen in the night sky may also be distant disklike systems similar to our own but seperate. Kant called these objects island universes. Charles Messier (1730–1817) compiled a list of 103 nebulae, many of these Messier Objects are indeed k ...
Galaxy Hunters Article, Cosmology Information, First Star Facts
... largest meetings ever devoted to the origin of galaxies. The first star was born about 14 billion years ago, Abel believes, in a universe that was more mysterious but also far simpler than our own. Smaller and denser than today, the universe was pitch-black and contained mostly hydrogen and helium w ...
... largest meetings ever devoted to the origin of galaxies. The first star was born about 14 billion years ago, Abel believes, in a universe that was more mysterious but also far simpler than our own. Smaller and denser than today, the universe was pitch-black and contained mostly hydrogen and helium w ...
PPT - ALFALFA survey
... • The ADBS sample provides an excellent means to investigate the environmental influences on gas-rich galaxies in low-to-intermediate densities, thereby permitting an assessment of how the local environment of a galaxy affects its evolution. ...
... • The ADBS sample provides an excellent means to investigate the environmental influences on gas-rich galaxies in low-to-intermediate densities, thereby permitting an assessment of how the local environment of a galaxy affects its evolution. ...
Lifting the Dusty Veil on the Cradle of Star Birth
... galaxies to z ~ 10, with evolution applied, and size-dependence with z deduce core size of cluster mass dist’n ...
... galaxies to z ~ 10, with evolution applied, and size-dependence with z deduce core size of cluster mass dist’n ...
Module 5: To the Galaxies and Beyond!
... Galaxies come in many different shapes and sizes, not just barred spirals like our Milky Way galaxy. Astronomers find it useful to divide galaxies into groups based on how they look in visible light, much like one would see if looking through a telescope. The Hubble sequence is a way of classifying ...
... Galaxies come in many different shapes and sizes, not just barred spirals like our Milky Way galaxy. Astronomers find it useful to divide galaxies into groups based on how they look in visible light, much like one would see if looking through a telescope. The Hubble sequence is a way of classifying ...
dark matter - University of Texas Astronomy Home Page
... the center and less on the outskirts. Based on this information, where do you expect most of the mass to be located in a galaxy? 2. At right is a picture of a spiral galaxy similar to the Milky Way. The orbits of three stars are labeled. Star A is on the edge of the bulge. The Sun’s orbit is marked ...
... the center and less on the outskirts. Based on this information, where do you expect most of the mass to be located in a galaxy? 2. At right is a picture of a spiral galaxy similar to the Milky Way. The orbits of three stars are labeled. Star A is on the edge of the bulge. The Sun’s orbit is marked ...
Andromeda Galaxy
The Andromeda Galaxy (/ænˈdrɒmɨdə/), also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth. It is the nearest major galaxy to the Milky Way and was often referred to as the Great Andromeda Nebula in older texts. It received its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda. Being approximately 220,000 light years across, it is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 44 other smaller galaxies.The Andromeda Galaxy is the most massive galaxy in the Local Group as well. Despite earlier findings that suggested that the Milky Way contains more dark matter and could be the most massive in the grouping, the 2006 observations by the Spitzer Space Telescope revealed that Andromeda contains one trillion (1012) stars: at least twice the number of stars in the Milky Way, which is estimated to be 200–400 billion.The Andromeda Galaxy is estimated to be 1.5×1012 solar masses, while the mass of the Milky Way is estimated to be 8.5×1011 solar masses. In comparison, a 2009 study estimated that the Milky Way and M31 are about equal in mass, while a 2006 study put the mass of the Milky Way at ~80% of the mass of the Andromeda Galaxy. The Milky Way and Andromeda are expected to collide in 3.75 billion years, eventually merging to form a giant elliptical galaxy or perhaps a large disk galaxy.At 3.4, the apparent magnitude of the Andromeda Galaxy is one of the brightest of any of the Messier objects, making it visible to the naked eye on moonless nights even when viewed from areas with moderate light pollution. Although it appears more than six times as wide as the full Moon when photographed through a larger telescope, only the brighter central region is visible to the naked eye or when viewed using binoculars or a small telescope and would it hence appear to be but another star.