implication on the mass and
... 30% to 50% of the mass locked in stars in present day galaxies actually condensed into stars at z<1 (Dickinson et al. 2003; Pozzetti et al. 2003; Drory et al. 2004; Bell ...
... 30% to 50% of the mass locked in stars in present day galaxies actually condensed into stars at z<1 (Dickinson et al. 2003; Pozzetti et al. 2003; Drory et al. 2004; Bell ...
Quasars, Active Galaxies, and Gamma
... • Short, intense bursts of gamma rays are observed at random times coming from random parts of the sky • The origin of short-duration gamma-ray bursters is unknown ...
... • Short, intense bursts of gamma rays are observed at random times coming from random parts of the sky • The origin of short-duration gamma-ray bursters is unknown ...
Chapter 27 Quasars, Active Galaxies, and Gamma
... object with a spectrum much like a dim star high red shift enormous recessional velocity huge distance (from Hubble’s Law) enormously luminous compact physical size powered by supermassive black hole often produce huge jets ...
... object with a spectrum much like a dim star high red shift enormous recessional velocity huge distance (from Hubble’s Law) enormously luminous compact physical size powered by supermassive black hole often produce huge jets ...
25.2 Stellar Evolution
... They are our nearest galactic neighbors In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. ...
... They are our nearest galactic neighbors In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. ...
A Universe of Galaxies - Pennsylvania State University
... The light from most galaxies is just the sum of light from all of the stars within it, so like starlight, a galaxy’s light is brightest at optical wavelengths and fainter at shorter and longer wavelengths. ...
... The light from most galaxies is just the sum of light from all of the stars within it, so like starlight, a galaxy’s light is brightest at optical wavelengths and fainter at shorter and longer wavelengths. ...
The Discovery of Galaxies
... - elliptical (like a football) - spiral (like a pinwheel) - irregular (like something not regular…) ...
... - elliptical (like a football) - spiral (like a pinwheel) - irregular (like something not regular…) ...
How do we know?? = (apparent brightness) x distance Luminosity Apparent brightness:
... • Doppler shift of wavelength of light Î velocity of recession (redshift) due to expansion of Universe. Î huge distance Î huge luminosity! ...
... • Doppler shift of wavelength of light Î velocity of recession (redshift) due to expansion of Universe. Î huge distance Î huge luminosity! ...
powerpoint
... • No matter what, it will eventually be merged into the larger galaxy. • There may be some star formation in the big galaxy as this will set out a density wave, but most of the star formation will occur in the small galaxy – if it has any gas in it. ...
... • No matter what, it will eventually be merged into the larger galaxy. • There may be some star formation in the big galaxy as this will set out a density wave, but most of the star formation will occur in the small galaxy – if it has any gas in it. ...
Dynamics of elliptical galaxies
... Classification of stellar orbits in elliptical galaxies is much more complicated than for disk galaxies. Most important distinction is between axisymmetric galaxies (prolate or oblate) and triaxial galaxies. In an axisymmetric galaxy, there is a plane, perpendicular to the symmetry axis, in which gr ...
... Classification of stellar orbits in elliptical galaxies is much more complicated than for disk galaxies. Most important distinction is between axisymmetric galaxies (prolate or oblate) and triaxial galaxies. In an axisymmetric galaxy, there is a plane, perpendicular to the symmetry axis, in which gr ...
Lecture 8 - University of Sydney
... Big galaxies are relatively easy to see Small galaxies are hard to see Whenever we look hard, we see many small galaxies for every large galaxy! This is true in our very own backyard ...
... Big galaxies are relatively easy to see Small galaxies are hard to see Whenever we look hard, we see many small galaxies for every large galaxy! This is true in our very own backyard ...
Document
... Big galaxies are relatively easy to see Small galaxies are hard to see Whenever we look hard, we see many small galaxies for every large galaxy! This is true in our very own backyard ...
... Big galaxies are relatively easy to see Small galaxies are hard to see Whenever we look hard, we see many small galaxies for every large galaxy! This is true in our very own backyard ...
Quasars - Ann Arbor Earth Science
... lines. Variability shows that the energy must arise in a tiny region, although some quasars have hundreds of time the energy output of normal galaxies. Their radio structures often include jets and lobes similar to what we see from radio galaxies. ...
... lines. Variability shows that the energy must arise in a tiny region, although some quasars have hundreds of time the energy output of normal galaxies. Their radio structures often include jets and lobes similar to what we see from radio galaxies. ...
Galaxies - Physics
... • Please pick up graded work • Homework 12 due Monday (requires internet use) • Second project is due in two weeks • Please reread lyrics to Monty Python galaxy song; document the inconsistency for a free Milky Way bar! ...
... • Please pick up graded work • Homework 12 due Monday (requires internet use) • Second project is due in two weeks • Please reread lyrics to Monty Python galaxy song; document the inconsistency for a free Milky Way bar! ...
EXERCISES: Set 1 of 4 Q1: Suppose the universe consisted of a
... Q1: Suppose the universe consisted of a random, statistically uniform, distribution of stars in space, all identical to the Sun, with radius R = R = 7 × 1010 cm, and a space density of n = 1 pc−3 . Olber’s paradox states that, if such a universe were infinitely old, the surface brightness of the sk ...
... Q1: Suppose the universe consisted of a random, statistically uniform, distribution of stars in space, all identical to the Sun, with radius R = R = 7 × 1010 cm, and a space density of n = 1 pc−3 . Olber’s paradox states that, if such a universe were infinitely old, the surface brightness of the sk ...
Universe 8e Lecture Chapter 24 Galaxies
... globular clusters, H II regions, and supernovae in a galaxy, are used in estimating intergalactic distances. The Tully-Fisher relation, which correlates the width of the 21-cm line of hydrogen in a spiral galaxy with its luminosity, can also be used for determining distance. A method that can be use ...
... globular clusters, H II regions, and supernovae in a galaxy, are used in estimating intergalactic distances. The Tully-Fisher relation, which correlates the width of the 21-cm line of hydrogen in a spiral galaxy with its luminosity, can also be used for determining distance. A method that can be use ...
Mean Cut for formation
... corresponding to 1 through 5 σ for a two-dimensional Gaussian have been plotted. The one-dimensional marginalized values are Ω mh2 = 0.130 ± 0.010 and ...
... corresponding to 1 through 5 σ for a two-dimensional Gaussian have been plotted. The one-dimensional marginalized values are Ω mh2 = 0.130 ± 0.010 and ...
The Guide to the Galaxies
... not show much star formation and are dominated by an older generation of stars. Many giant elliptical galaxies form from the collision and merging of smaller galaxies. This is a similar process to the merging of the Milky Way and Andromeda galaxy expected in a few billion years from now. These giant ...
... not show much star formation and are dominated by an older generation of stars. Many giant elliptical galaxies form from the collision and merging of smaller galaxies. This is a similar process to the merging of the Milky Way and Andromeda galaxy expected in a few billion years from now. These giant ...
The Moon
... The HST orbits above Earth’s atmosphere at about 500 km. Because of this, it does not experience atmospheric interference as do ground based telescopes on earth. The HST obtained the Ultra Deep Field image by collecting light from a small portion of the sky for about a million seconds. (About 11 ...
... The HST orbits above Earth’s atmosphere at about 500 km. Because of this, it does not experience atmospheric interference as do ground based telescopes on earth. The HST obtained the Ultra Deep Field image by collecting light from a small portion of the sky for about a million seconds. (About 11 ...
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).