talk
... • Representative sample of 14 luminous and ultraluminous infrared galaxies • DL < 200 Mpc (resolution 1” ~ 1 kpc) • log(LFIR) > 11.4 • All with previous interferometric observations in the CO J=1-0 line ...
... • Representative sample of 14 luminous and ultraluminous infrared galaxies • DL < 200 Mpc (resolution 1” ~ 1 kpc) • log(LFIR) > 11.4 • All with previous interferometric observations in the CO J=1-0 line ...
Nuclear Stellar Populations in Bright Spiral Galaxies
... 6 of 8 non-quiescent galaxies are interacting, suggesting that the interactions caused gas infall that triggered star formation. As with the barred systems, though, many of the quiescent galaxies are also interacting with other galaxies, so interacting systems do not always exhibit recent nuclear ...
... 6 of 8 non-quiescent galaxies are interacting, suggesting that the interactions caused gas infall that triggered star formation. As with the barred systems, though, many of the quiescent galaxies are also interacting with other galaxies, so interacting systems do not always exhibit recent nuclear ...
Astro 6590: Galaxies and the Universe Astro
... Definition: what is a galaxy? • A galaxy is a self-gravitating collection of about 106 to 1011 stars, plus an amount up to 1/2 of as much by mass of gas, and about 10X as much by mass of dark matter. The stars and gas are about 70% hydrogen by mass and 25% helium, the rest being heavier elements (ca ...
... Definition: what is a galaxy? • A galaxy is a self-gravitating collection of about 106 to 1011 stars, plus an amount up to 1/2 of as much by mass of gas, and about 10X as much by mass of dark matter. The stars and gas are about 70% hydrogen by mass and 25% helium, the rest being heavier elements (ca ...
GEARS Workshop Monday - Georgia Southern University
... • We are going to compare and contrast some important features of ellipticals and spirals by using light at different wavelengths. • Hydrogen gas, has a ‘spin-flip’ electronic energy transition which is very rare and the radiation from that transition occurs at 21 cm (or radio) ...
... • We are going to compare and contrast some important features of ellipticals and spirals by using light at different wavelengths. • Hydrogen gas, has a ‘spin-flip’ electronic energy transition which is very rare and the radiation from that transition occurs at 21 cm (or radio) ...
Galaxy - Cloudfront.net
... Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Irregular Galaxy •Do not fit into the elliptical or spiral category •Have no definite shape •Frequently the result of when galaxies collide ...
... Topic: Galaxies Essential Question: What is a galaxy and how are they classified? Irregular Galaxy •Do not fit into the elliptical or spiral category •Have no definite shape •Frequently the result of when galaxies collide ...
Spiral galaxies: Spiral galaxies: Inclination Spiral galaxies: Internal
... absorption. Note that spin flips are classically “forbidden”: on average, a single hydrogen atom will take 107 years to decay! The probability of an absorption is even rarer. • HI gas mass is directly proportional to 21 cm line intensity • HI disk is much more extended than optical light, typically ...
... absorption. Note that spin flips are classically “forbidden”: on average, a single hydrogen atom will take 107 years to decay! The probability of an absorption is even rarer. • HI gas mass is directly proportional to 21 cm line intensity • HI disk is much more extended than optical light, typically ...
Determining Distances to Other Galaxies
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
Large Scale Structure of the Universe
... Since the mid-1980’s astronomers have gathered data allowing, for the first time, a view of the structure of the Universe in three-dimensions. You might speculate that an image of this structure could be determined by photographing stars to see if they form some kind of pattern. An example of a star ...
... Since the mid-1980’s astronomers have gathered data allowing, for the first time, a view of the structure of the Universe in three-dimensions. You might speculate that an image of this structure could be determined by photographing stars to see if they form some kind of pattern. An example of a star ...
File - Mrs. Mantecon Science Class
... ______ 1. What is a giant ball of hot gases that undergo nuclear fusion? a. a planet c. a star cluster b. a star d. a solar system ______ 2. The Milky Way galaxy is an example of a(n) a. spiral galaxy. c. elliptical galaxy. b. quasar. d. irregular galaxy. ______ 3. The strength of the force of gravi ...
... ______ 1. What is a giant ball of hot gases that undergo nuclear fusion? a. a planet c. a star cluster b. a star d. a solar system ______ 2. The Milky Way galaxy is an example of a(n) a. spiral galaxy. c. elliptical galaxy. b. quasar. d. irregular galaxy. ______ 3. The strength of the force of gravi ...
galaxy worksheet
... Galaxies are divided into three types according to their shape. The types are spiral, elliptical, and irregular galaxies. A spiral galaxy is a rotating disk of stars and dust. At the center of the disk is a dense bulge of matter. Several arms spiral out from the center. A spiral galaxy has a lot o ...
... Galaxies are divided into three types according to their shape. The types are spiral, elliptical, and irregular galaxies. A spiral galaxy is a rotating disk of stars and dust. At the center of the disk is a dense bulge of matter. Several arms spiral out from the center. A spiral galaxy has a lot o ...
www.univ-amu.fr www.lam.fr PhD Thesis PhD thesis director name
... our Universe, are unique cosmic events. Lasting from a few milliseconds to several minutes, the radiation emitted in this interval is equivalent to that of the Sun over its entire life. They are hundreds of times brighter than a typical supernova, the ultimate end of a massive star. Due to the extre ...
... our Universe, are unique cosmic events. Lasting from a few milliseconds to several minutes, the radiation emitted in this interval is equivalent to that of the Sun over its entire life. They are hundreds of times brighter than a typical supernova, the ultimate end of a massive star. Due to the extre ...
Galaxies
... • The fractional mass of HI to the total galaxy mass increases as one goes from E to S galaxies, implying that the fuel for star formation also increases, so the SFR should increase from early to late types – Caveat: There are large disk galaxies with an extremely large mass of HI that show very lit ...
... • The fractional mass of HI to the total galaxy mass increases as one goes from E to S galaxies, implying that the fuel for star formation also increases, so the SFR should increase from early to late types – Caveat: There are large disk galaxies with an extremely large mass of HI that show very lit ...
Star-Formation in Close Pairs Selected from the Sloan Digital Sky
... The ratio of these radii is the (inverse) concentration index: C = 50% light radius / 90% light radius and correlates with morphological type (e.g. Morgan 1958) Low values of concentration index = systems with centrally condensed light profiles – de Vaucouleurs profiles – galaxies of early morpholog ...
... The ratio of these radii is the (inverse) concentration index: C = 50% light radius / 90% light radius and correlates with morphological type (e.g. Morgan 1958) Low values of concentration index = systems with centrally condensed light profiles – de Vaucouleurs profiles – galaxies of early morpholog ...
GEARS Workshop Monday
... • We are going to compare and contrast some important features of ellipticals and spirals by using light at different wavelengths. • Hydrogen gas, has a ‘spin-flip’ electronic energy transition which is very rare and the radiation from that transition occurs at 21 cm (or radio) ...
... • We are going to compare and contrast some important features of ellipticals and spirals by using light at different wavelengths. • Hydrogen gas, has a ‘spin-flip’ electronic energy transition which is very rare and the radiation from that transition occurs at 21 cm (or radio) ...
Quiz 2 Lecture 12
... What are the implications if your astronomy teacher discovers that methods of determining distances to galaxies are off by 100%, that galaxies are one-half as distant as we currently believe them to be? a. None of these choices. It would not alter our theories in any important way. b. The Hubble con ...
... What are the implications if your astronomy teacher discovers that methods of determining distances to galaxies are off by 100%, that galaxies are one-half as distant as we currently believe them to be? a. None of these choices. It would not alter our theories in any important way. b. The Hubble con ...
Coma Cluster of Galaxies Activity
... As a general rule, spiral galaxies (S and SB) have a lot of gas and are still forming lots of new stars. Elliptical and lenticular galaxies (E, S0, and SB0) are gas poor and are not making many new stars. Spirals are Gas-rich Both Ellipticals and Lenticulars are Gas-poor Galaxies that are very clos ...
... As a general rule, spiral galaxies (S and SB) have a lot of gas and are still forming lots of new stars. Elliptical and lenticular galaxies (E, S0, and SB0) are gas poor and are not making many new stars. Spirals are Gas-rich Both Ellipticals and Lenticulars are Gas-poor Galaxies that are very clos ...
15-3 Notes: Galaxies
... Astronomers classify a galaxy as a spiral, elliptical, or irregular galaxy according to its shape. Spiral galaxies, such as the Andromeda galaxy, have a bulge at the center and spiral arms. The spiral arms are made up of gas, dust, and new stars that have formed. The galaxy in which we live is a spi ...
... Astronomers classify a galaxy as a spiral, elliptical, or irregular galaxy according to its shape. Spiral galaxies, such as the Andromeda galaxy, have a bulge at the center and spiral arms. The spiral arms are made up of gas, dust, and new stars that have formed. The galaxy in which we live is a spi ...
Galaxies - cloudfront.net
... dust. Most of their stars are young and blue in color. • Elliptical galaxies are more-or-less egg shaped. The smallest elliptical galaxies are as small as some globular clusters. The largest elliptical galaxies can contain over a trillion stars. Most stars in elliptical galaxies are reddish to yello ...
... dust. Most of their stars are young and blue in color. • Elliptical galaxies are more-or-less egg shaped. The smallest elliptical galaxies are as small as some globular clusters. The largest elliptical galaxies can contain over a trillion stars. Most stars in elliptical galaxies are reddish to yello ...
File
... Three Main Types of Galaxies: • Ellipticals - galaxies are pure bulge, no disk component ...
... Three Main Types of Galaxies: • Ellipticals - galaxies are pure bulge, no disk component ...
presentation (PPT format)
... difference between barred spirals and ordinary spirals may thus lie in the amount of dark matter ...
... difference between barred spirals and ordinary spirals may thus lie in the amount of dark matter ...
HST Key Project to Measure the Hubble Constant from
... Type two: older stars, low metallicity, found in halo ...
... Type two: older stars, low metallicity, found in halo ...
Our Galactic Archipelago
... Its bulge is bigger that ours, but it has less gas. Keep this in mind, it does mean something! ...
... Its bulge is bigger that ours, but it has less gas. Keep this in mind, it does mean something! ...
Atlas of Peculiar Galaxies
The Atlas of Peculiar Galaxies is a catalog of peculiar galaxies produced by Halton Arp. A total of 338 galaxies are presented in the atlas, which was originally published in 1966 by the California Institute of Technology.The primary goal of the catalog was to present photographs of examples of the different kinds of peculiar structures found among nearby galaxies. Arp realized that the reason why galaxies formed into spiral or elliptical shapes was not well understood. He perceived peculiar galaxies as small ""experiments"" that astronomers could use to understand the physical processes that distort spiral or elliptical galaxies. With this atlas, astronomers had a sample of peculiar galaxies that they could study in more detail. The atlas does not present a complete overview of every peculiar galaxy in the sky but instead provides examples of the different phenomena as observed in nearby galaxies.Because little was known at the time of publication about the physical processes that caused the different shapes, the galaxies in the atlas are sorted based on their appearance. Objects 1–101 are individual peculiar spiral galaxies or spiral galaxies that apparently have small companions. Objects 102–145 are elliptical and elliptical-like galaxies. Individual or groups of galaxies with neither elliptical nor spiral shapes are listed as objects 146–268. Objects 269–327 are double galaxies. Finally, objects that simply do not fit into any of the above categories are listed as objects 332–338. Most objects are best known by their other designations, but a few galaxies are best known by their Arp numbers (such as Arp 220).Today, the physical processes that lead to the peculiarities seen in the Arp atlas are now well understood. A large number of the objects are interacting galaxies, including M51 (Arp 85), Arp 220, and the Antennae Galaxies (NGC 4038/NGC 4039, or Arp 244). A few of the galaxies are simply dwarf galaxies that do not have enough mass to produce enough gravity to allow the galaxies to form any cohesive structure. NGC 1569 (Arp 210) is an example of one of the dwarf galaxies in the atlas. A few other galaxies are radio galaxies. These objects contain active galactic nuclei that produce powerful jets of gas called radio jets. The atlas includes the nearby radio galaxies M87 (Arp 152) and Centaurus A (Arp 153).