The Milky Way - Montgomery College
... Strategies to explore the structure of our Milky Way I. Select bright objects that you can see throughout the Milky Way and trace their directions and distances. II. Observe objects at wavelengths other than visible (to circumvent the problem of optical obscuration), and catalog their directions an ...
... Strategies to explore the structure of our Milky Way I. Select bright objects that you can see throughout the Milky Way and trace their directions and distances. II. Observe objects at wavelengths other than visible (to circumvent the problem of optical obscuration), and catalog their directions an ...
Week8Lecture1
... Our Galaxy is a spiral galaxy. Here are two other spiral galaxies, one viewed from the side and the other from the top, which are thought to resemble the Milky Way: ...
... Our Galaxy is a spiral galaxy. Here are two other spiral galaxies, one viewed from the side and the other from the top, which are thought to resemble the Milky Way: ...
16. Properties of Stars
... What is the Hertzsprung-Russell (HR) diagram? • It is the most important classification tool in stellar astronomy. Stars are located on the HR diagram by their surface temperature (or spectral type) along the horizontal axis and their luminosity along the vertical axis. Temperature decreases from le ...
... What is the Hertzsprung-Russell (HR) diagram? • It is the most important classification tool in stellar astronomy. Stars are located on the HR diagram by their surface temperature (or spectral type) along the horizontal axis and their luminosity along the vertical axis. Temperature decreases from le ...
Microsoft Power Point version
... What is the Hertzsprung-Russell (HR) diagram? • It is the most important classification tool in stellar astronomy. Stars are located on the HR diagram by their surface temperature (or spectral type) along the horizontal axis and their luminosity along the vertical axis. Temperature decreases from le ...
... What is the Hertzsprung-Russell (HR) diagram? • It is the most important classification tool in stellar astronomy. Stars are located on the HR diagram by their surface temperature (or spectral type) along the horizontal axis and their luminosity along the vertical axis. Temperature decreases from le ...
the star
... Such galaxies are oval in shape, have no discernible spiral structure, and little gas or dust. Reddish in color. Very few new stars being born. Elliptical galaxies come in all sizes from just a little larger than globular clusters to 10 times the mass of the Milky Way. The most common kind of galaxy ...
... Such galaxies are oval in shape, have no discernible spiral structure, and little gas or dust. Reddish in color. Very few new stars being born. Elliptical galaxies come in all sizes from just a little larger than globular clusters to 10 times the mass of the Milky Way. The most common kind of galaxy ...
May 2010 - Pomona Valley Amateur Astronomers
... starry disc at the heart of the Andromeda Galaxy and it is stated that it may be hard to see such discs though they are thought to be common. Black holes are considered millions or billions of times as massive as the sun and reside at the heat of most galaxies. The thought is that the black holes ha ...
... starry disc at the heart of the Andromeda Galaxy and it is stated that it may be hard to see such discs though they are thought to be common. Black holes are considered millions or billions of times as massive as the sun and reside at the heat of most galaxies. The thought is that the black holes ha ...
Colour - Magnitude Diagram for M 45
... Colour-Magnitude diagram. This is just a type of Hertzsprung-Russell (HR) diagram in which we plot Colour Index rather than Spectral Class on the horizontal axis; and use the apparent visual magnitude, V, for the vertical axis. ...
... Colour-Magnitude diagram. This is just a type of Hertzsprung-Russell (HR) diagram in which we plot Colour Index rather than Spectral Class on the horizontal axis; and use the apparent visual magnitude, V, for the vertical axis. ...
Lecture 17: General Relativity and Black Holes
... (c) correct systematically counting stars in each direction (d) observing globular star clusters (e) finding the distances to the spiral arms. 4. Shapley was able to determine the distance to a globular star cluster by identifying and studying each cluster's (a) RR Lyrae stars (b) Population I stars ...
... (c) correct systematically counting stars in each direction (d) observing globular star clusters (e) finding the distances to the spiral arms. 4. Shapley was able to determine the distance to a globular star cluster by identifying and studying each cluster's (a) RR Lyrae stars (b) Population I stars ...
M13 – The Great Hercules Cluster
... like a pinwheel. On a clear, dark summer night in the country, you can see a pale glow arching overhead from South to North. This is just the glow of that disk of a hundred billion stars seen edge-on. When we look at this band of light we are looking out along the plane of the galaxy. Surrounding th ...
... like a pinwheel. On a clear, dark summer night in the country, you can see a pale glow arching overhead from South to North. This is just the glow of that disk of a hundred billion stars seen edge-on. When we look at this band of light we are looking out along the plane of the galaxy. Surrounding th ...
Westerlund 1 : A Super-Star Cluster within the Milky Way
... from which we infer an age of 3-5Myr. For an adopted Kroupa IMF we derive a mass of 105 M and radius of 0.3pc for an estimated distance of 2.5kpc. As such, Wd1 is the most massive, and densest, young cluster in the Local Group, exceeding NGC3603 and the Arches cluster in the Milky Way and R136 in t ...
... from which we infer an age of 3-5Myr. For an adopted Kroupa IMF we derive a mass of 105 M and radius of 0.3pc for an estimated distance of 2.5kpc. As such, Wd1 is the most massive, and densest, young cluster in the Local Group, exceeding NGC3603 and the Arches cluster in the Milky Way and R136 in t ...
Study Guide 4 Part A Outline
... o Elliptical galaxies contain mainly old stars and have little interstellar gas o Spiral galaxies are similar to the Milky Way and have both young and old stars. o The Milky Way is in a small group of galaxies called the Local Group, but giant clusters of galaxies also exist o As we look through the ...
... o Elliptical galaxies contain mainly old stars and have little interstellar gas o Spiral galaxies are similar to the Milky Way and have both young and old stars. o The Milky Way is in a small group of galaxies called the Local Group, but giant clusters of galaxies also exist o As we look through the ...
1 Ay 124 Winter 2016 – HOMEWORK #3
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
1 Ay 124 Winter 2014 – HOMEWORK #3
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
Week 11 Concept Summary
... any cluster you can identify individual stars in, pretty much anywhere in the Milky Way or our satellite galaxies. (d) Standard Candles - Variable Stars: A standard candle is any bright object that you know intrinsically how bright it is so that you can compare that to its apparent brightness and ge ...
... any cluster you can identify individual stars in, pretty much anywhere in the Milky Way or our satellite galaxies. (d) Standard Candles - Variable Stars: A standard candle is any bright object that you know intrinsically how bright it is so that you can compare that to its apparent brightness and ge ...
globular cluster - Harding University
... have a period – luminosity relationship. By measuring the distances to, and the relative locations of the globular clusters, Shapley determined that these clusters were spherically distributed about a point not centered on the Earth. He made the correct assumption that these clusters are cluster ...
... have a period – luminosity relationship. By measuring the distances to, and the relative locations of the globular clusters, Shapley determined that these clusters were spherically distributed about a point not centered on the Earth. He made the correct assumption that these clusters are cluster ...
The Milky Way: Home to Star Clusters
... was the original extent of the galaxy, and that this was created first, from the primordial gas that eventually collapsed in on itself, also demonstrated by the old stars contained within the globular clusters. This matter condensed to create the central bulge, which ultimately began to rotate, crea ...
... was the original extent of the galaxy, and that this was created first, from the primordial gas that eventually collapsed in on itself, also demonstrated by the old stars contained within the globular clusters. This matter condensed to create the central bulge, which ultimately began to rotate, crea ...
Sequencing the Stars
... All stars in a globular cluster formed at the same time but with various initial masses. The arrows show the progression from lower mass stars to more massive ones. single point using the average of the two brightnesses and the average of the two colors. But, if the brightnesses are significantly di ...
... All stars in a globular cluster formed at the same time but with various initial masses. The arrows show the progression from lower mass stars to more massive ones. single point using the average of the two brightnesses and the average of the two colors. But, if the brightnesses are significantly di ...
Galaxies
... • Extends 50,000 light years beyond the central bulge • Forms spiral arms that contain a lot of gas and dust • Population I stars are found in the spiral arms – these are young O and B main-sequence stars – they are often found in open clusters ...
... • Extends 50,000 light years beyond the central bulge • Forms spiral arms that contain a lot of gas and dust • Population I stars are found in the spiral arms – these are young O and B main-sequence stars – they are often found in open clusters ...
How many stars are in the Milky Way Galaxy?
... A is what we see from Earth inside the Milky Way while B is what the Milky Way “might” look like if we were far away looking back at our own galaxy from some other galaxy. ...
... A is what we see from Earth inside the Milky Way while B is what the Milky Way “might” look like if we were far away looking back at our own galaxy from some other galaxy. ...
The Milky Way as a Spiral galaxy
... •A composite of 77 photographs showing details of the star clouds in the Milky Way. By the early 1900’s the dark areas were understood to be obscuring clouds of dust and gas. This source of interstellar absorption invalidated the star counts Herschel (and later astronomers) used to estimate the siz ...
... •A composite of 77 photographs showing details of the star clouds in the Milky Way. By the early 1900’s the dark areas were understood to be obscuring clouds of dust and gas. This source of interstellar absorption invalidated the star counts Herschel (and later astronomers) used to estimate the siz ...
The Milky Way galaxy
... The Sun is found in the plane of the Galaxy. It moves on a nice circular orbit around the center of the Galaxy along with other stars formed in the plane. If a halo star is passing through the plane, it will have a large relative velocity with respect to the Sun. So this is one way to identify a s ...
... The Sun is found in the plane of the Galaxy. It moves on a nice circular orbit around the center of the Galaxy along with other stars formed in the plane. If a halo star is passing through the plane, it will have a large relative velocity with respect to the Sun. So this is one way to identify a s ...
Document
... • Blue Stars (Pop I) in disk and spiral arms • Red Stars (Pop II) in bulge and halo • This is true for other galaxies as well • Pop II stars may have elongated tilted orbits whereas Pop I stars orbits are in the disk ...
... • Blue Stars (Pop I) in disk and spiral arms • Red Stars (Pop II) in bulge and halo • This is true for other galaxies as well • Pop II stars may have elongated tilted orbits whereas Pop I stars orbits are in the disk ...
Introduction to Galaxies and Cosmology Exercises 2
... 9. (Challenging) A quasar emits two radiating clouds in our general direction at 13/14 the speed of light. They are first observed when they appear to have been first produced at the central powerhouse, and are subsequently observed to move apparently outward in opposite directions from the centre o ...
... 9. (Challenging) A quasar emits two radiating clouds in our general direction at 13/14 the speed of light. They are first observed when they appear to have been first produced at the central powerhouse, and are subsequently observed to move apparently outward in opposite directions from the centre o ...
Galaxy
... shape One of the closest neighboring galaxies to the Milky Way is an irregular galaxy It is about 160,000 light years away ...
... shape One of the closest neighboring galaxies to the Milky Way is an irregular galaxy It is about 160,000 light years away ...
How Old is the Universe?
... other stars because the lines are too weak. But in CS 22892-052 the thorium lines can be seen because the iron lines are very weak. The Th/Eu (Europium) ratio in this star is 0.219 compared to 0.369 in the Solar System now. Thorium decays with a half-life of 14.05 Gyr, so the Solar System formed wit ...
... other stars because the lines are too weak. But in CS 22892-052 the thorium lines can be seen because the iron lines are very weak. The Th/Eu (Europium) ratio in this star is 0.219 compared to 0.369 in the Solar System now. Thorium decays with a half-life of 14.05 Gyr, so the Solar System formed wit ...
Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. The name of this category of star cluster is derived from the Latin globulus—a small sphere. A globular cluster is sometimes known more simply as a globular.Globular clusters, which are found in the halo of a galaxy, contain considerably more stars and are much older than the less dense galactic, or open clusters, which are found in the disk. Globular clusters are fairly common; there are about 150 to 158 currently known globular clusters in the Milky Way, with perhaps 10 to 20 more still undiscovered. These globular clusters orbit the Galaxy at radii of 40 kiloparsecs (130,000 light-years) or more. Larger galaxies can have more: Andromeda, for instance, may have as many as 500. Some giant elliptical galaxies, particularly those at the centers of galaxy clusters, such as M87, have as many as 13,000 globular clusters.Every galaxy of sufficient mass in the Local Group has an associated group of globular clusters, and almost every large galaxy surveyed has been found to possess a system of globular clusters. The Sagittarius Dwarf galaxy and the disputed Canis Major Dwarf galaxy appear to be in the process of donating their associated globular clusters (such as Palomar 12) to the Milky Way. This demonstrates how many of this galaxy's globular clusters might have been acquired in the past.Although it appears that globular clusters contain some of the first stars to be produced in the galaxy, their origins and their role in galactic evolution are still unclear. It does appear clear that globular clusters are significantly different from dwarf elliptical galaxies and were formed as part of the star formation of the parent galaxy rather than as a separate galaxy. However, recent conjectures by astronomers suggest that globular clusters and dwarf spheroidals may not be clearly separate and distinct types of objects.