Document
... • A cluster of many groups and clusters of galaxies • Largest cluster is the Virgo cluster containing over a thousand galaxies. • Clusters and groups of galaxies are gravitationally bound together, however the clusters and groups spread away from each other as the Universe expands. ...
... • A cluster of many groups and clusters of galaxies • Largest cluster is the Virgo cluster containing over a thousand galaxies. • Clusters and groups of galaxies are gravitationally bound together, however the clusters and groups spread away from each other as the Universe expands. ...
The kinematics of Galaxies in Compact Groups
... galaxies in compact groups have “too low velocities for their luminosities or, luminosities which are overbright for their rotation velocities”. HCGs have low M/L compared to field by 30% - this could be explained if they have smaller dark halos than their field counterparts. WE REVISIT THIS PROBLEM ...
... galaxies in compact groups have “too low velocities for their luminosities or, luminosities which are overbright for their rotation velocities”. HCGs have low M/L compared to field by 30% - this could be explained if they have smaller dark halos than their field counterparts. WE REVISIT THIS PROBLEM ...
z - STScI
... over HST comparable to the advance of HST • NGST can observe – Acceleration/deceleration of expanding universe – Cosmic dark matter – First luminous objects after Big Bang, even if much ...
... over HST comparable to the advance of HST • NGST can observe – Acceleration/deceleration of expanding universe – Cosmic dark matter – First luminous objects after Big Bang, even if much ...
File
... • orbits of stars and gas are “circular”, rotating about disk axis • star formation is on-going; it is can be fairly constant over the age of the galaxy • gas and dust mass fraction is roughly 10-50% of full ...
... • orbits of stars and gas are “circular”, rotating about disk axis • star formation is on-going; it is can be fairly constant over the age of the galaxy • gas and dust mass fraction is roughly 10-50% of full ...
A Study of the Spiral Galaxy M101 Elizabeth City State University
... A galaxy is the largest single unit of stars held together by gravity. There are three different types of galaxies, spiral, elliptical, and irregular. Figures 1a, b, and c show examples of each type. Galaxies have an enormous range in mass and size as indicated in Table 1. Galaxies are separated by ...
... A galaxy is the largest single unit of stars held together by gravity. There are three different types of galaxies, spiral, elliptical, and irregular. Figures 1a, b, and c show examples of each type. Galaxies have an enormous range in mass and size as indicated in Table 1. Galaxies are separated by ...
AGN-Hubble
... slope of the line now. If it’s really constant, then the age of the Universe is just 1/H [since H=v/D=(d/t)/d]. That’s because if you know how fast we are expanding, you can run the movie backwards and see when everything crunches together. If the Universe is slowing its expansion, you get a younger ...
... slope of the line now. If it’s really constant, then the age of the Universe is just 1/H [since H=v/D=(d/t)/d]. That’s because if you know how fast we are expanding, you can run the movie backwards and see when everything crunches together. If the Universe is slowing its expansion, you get a younger ...
Astronomy Review revised Key
... 23. If the star is located 4.3 light years away, how long will it be before we see the light of the star? 4.4 years. 18. What is the Big Bang Theory? The theory that all matter was once condensed into a single point called the singularity, and that singularity exploded sending matter out in all dir ...
... 23. If the star is located 4.3 light years away, how long will it be before we see the light of the star? 4.4 years. 18. What is the Big Bang Theory? The theory that all matter was once condensed into a single point called the singularity, and that singularity exploded sending matter out in all dir ...
A glance at the beginning of the Universe
... Taking a closer view of the particular galaxies in our research for quite a small part of them the values got for the age of the Universe coincide with the generally acknowledged. That refers to the observed galaxy NGC 4258. / For NGC 4725, the number we got for the age of the Universe is 14 billion ...
... Taking a closer view of the particular galaxies in our research for quite a small part of them the values got for the age of the Universe coincide with the generally acknowledged. That refers to the observed galaxy NGC 4258. / For NGC 4725, the number we got for the age of the Universe is 14 billion ...
Quasars - Ann Arbor Earth Science
... superluminal sources - radio sources which show internal motions (for example, increasing separation between the core and a knot in the jet) which appears faster than the speed of light in our frame of reference. The data are consistent with this being a transformation effect from seeing jets movin ...
... superluminal sources - radio sources which show internal motions (for example, increasing separation between the core and a knot in the jet) which appears faster than the speed of light in our frame of reference. The data are consistent with this being a transformation effect from seeing jets movin ...
The Milky Way and Its Neighbors
... • Companions to Milky Way or other galaxies such as M31 • Little or no gas or dust • No recent star formation • Approximately spheroidal in shape ...
... • Companions to Milky Way or other galaxies such as M31 • Little or no gas or dust • No recent star formation • Approximately spheroidal in shape ...
The galaxies that host powerful radio sources
... • Faint at radio and IR wavelengths. These facts suggest they are distant and dusty. ...
... • Faint at radio and IR wavelengths. These facts suggest they are distant and dusty. ...
The Classification of Galaxies By Daniel Underwood Contents The
... accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the ...
... accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the ...
Slayt 1
... crest is emitted from the planes new position, but the old crest keeps moving out in a circle from the planes original position The same thing happens again at a later time ...
... crest is emitted from the planes new position, but the old crest keeps moving out in a circle from the planes original position The same thing happens again at a later time ...
Stellar Pops 2
... • Understanding of photometry in AO corrected images is crucial. • Best age/metallicity diagnostics are for optical and near -IR combinations. • Maybe be better done with NGST (background, psf stability) but crowding could be a key ...
... • Understanding of photometry in AO corrected images is crucial. • Best age/metallicity diagnostics are for optical and near -IR combinations. • Maybe be better done with NGST (background, psf stability) but crowding could be a key ...
Lecture Notes – Galaxies
... Ellipticals contain old stars (Pop. II) and have very little interstellar material. Spirals contain young and old stars (Pop I and II) and have large amounts of interstellar material. It is thought that ellipticals formed most of their of stars early on, using up all their interstellar gas, and so d ...
... Ellipticals contain old stars (Pop. II) and have very little interstellar material. Spirals contain young and old stars (Pop I and II) and have large amounts of interstellar material. It is thought that ellipticals formed most of their of stars early on, using up all their interstellar gas, and so d ...
Milky Way Galaxy
... •Galaxy: large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. The Milky Way measures about 100,000 light-years across, and is thought to contain 200 billion stars. •Universe: the totality of known or supposed objects and phenomena ...
... •Galaxy: large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. The Milky Way measures about 100,000 light-years across, and is thought to contain 200 billion stars. •Universe: the totality of known or supposed objects and phenomena ...
EXERCISES: Set 2 of 4 Q1: The absolute magnitude of the Sun in
... (a) At what distances would: (i) a star like the Sun, (ii) a globular cluster, (iii) a galaxy like the Milky Way be as bright as the background sky? You can assume that in all three cases the distances involved are sufficiently large that the astronomical sources in question can be safely considered ...
... (a) At what distances would: (i) a star like the Sun, (ii) a globular cluster, (iii) a galaxy like the Milky Way be as bright as the background sky? You can assume that in all three cases the distances involved are sufficiently large that the astronomical sources in question can be safely considered ...
Unit 1: The Big Picture
... – Edwin Hubble measured approximate distance to nearby Andromeda…no way Milky Way was that large – 3 Types: spiral, elliptical, irregular ...
... – Edwin Hubble measured approximate distance to nearby Andromeda…no way Milky Way was that large – 3 Types: spiral, elliptical, irregular ...
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 ...
Scientific Results Summary
... stellar composition and distant dark matter. Subaru continues to lead the path of discovery for large 8m-class earth-based telescopes. One of the most globally exciting events, especially in the world of astronomy, was NASA’s Deep Impact Mission. Subaru and many other telescopes on Mauna Kea partici ...
... stellar composition and distant dark matter. Subaru continues to lead the path of discovery for large 8m-class earth-based telescopes. One of the most globally exciting events, especially in the world of astronomy, was NASA’s Deep Impact Mission. Subaru and many other telescopes on Mauna Kea partici ...
ONLINE practice exam
... nearby universe to be 0.2 H atom per cubic meter. In this case what is the matter density parameter? (e) Using the information from this galaxy, and assuming that there is NO dark energy. What is the fate of the universe? (f) On average, how much closer were galaxies to each other at z=0.2 than toda ...
... nearby universe to be 0.2 H atom per cubic meter. In this case what is the matter density parameter? (e) Using the information from this galaxy, and assuming that there is NO dark energy. What is the fate of the universe? (f) On average, how much closer were galaxies to each other at z=0.2 than toda ...
News Release - האוניברסיטה העברית
... hundred billion radiant stars, such as our sun, which extend across about 50,000 light years. Every galaxy is embedded in a spherical halo made of dark matter that cannot be seen but is detected through its massive gravitational attraction. The exact nature of this matter is still unknown. The galax ...
... hundred billion radiant stars, such as our sun, which extend across about 50,000 light years. Every galaxy is embedded in a spherical halo made of dark matter that cannot be seen but is detected through its massive gravitational attraction. The exact nature of this matter is still unknown. The galax ...
Galaxy Zoo
Galaxy Zoo is a crowdsourced astronomy project which invites people to assist in the morphological classification of large numbers of galaxies. (e.g.) It is an example of citizen science as it enlists the help of members of the public to help in scientific research. There have been seven versions up to July 2014, which are outlined in this article. Galaxy Zoo is part of the Zooniverse, a group of citizen science projects.