PC2491 Examples 2
... Show that, using reasonable arguments, the ‘half light radius’ (Re) of an elliptical galaxy mass M, luminosity L is related to the stellar dispersion (the average surface brightness within Re (e) via ...
... Show that, using reasonable arguments, the ‘half light radius’ (Re) of an elliptical galaxy mass M, luminosity L is related to the stellar dispersion (the average surface brightness within Re (e) via ...
ppt
... approaching one another at a speed of 100 - 140 km/sec. Some astronomers believe that Andromeda and the Milky Way will eventually merge together. The impact is predicted to occur in about 3 billion years. In that case the two galaxies will likely merge to form a giant elliptical galaxy. ...
... approaching one another at a speed of 100 - 140 km/sec. Some astronomers believe that Andromeda and the Milky Way will eventually merge together. The impact is predicted to occur in about 3 billion years. In that case the two galaxies will likely merge to form a giant elliptical galaxy. ...
Document
... structure, some nebulae might actually be entire separate galaxies or island universes 1774-1781 - Messier catalog compiled (109 objects in Northern sky) including Andromeda galaxy - M31 ...
... structure, some nebulae might actually be entire separate galaxies or island universes 1774-1781 - Messier catalog compiled (109 objects in Northern sky) including Andromeda galaxy - M31 ...
The Dynamics of the Galaxies in the Local Group
... • Necessary to determine the complete 3D velocity of an object • “Easy” to measure for stars close to the Sun • Very small and difficult to measure for distant objects • Never measured for Andromeda (tried since 1898) • Now finally measured with Hubble Space Telescope ...
... • Necessary to determine the complete 3D velocity of an object • “Easy” to measure for stars close to the Sun • Very small and difficult to measure for distant objects • Never measured for Andromeda (tried since 1898) • Now finally measured with Hubble Space Telescope ...
a description of planets and stars you may see
... on a very clear night even though it is about 145 lightyears in diameter. M13 was discovered by Edmond Halley in 1714, and catalogued by Messier in 1764. The Andromeda Galaxy is a spiral galaxy approximately 2.5 million light-years away in the constellation Andromeda. It is visible with the naked ey ...
... on a very clear night even though it is about 145 lightyears in diameter. M13 was discovered by Edmond Halley in 1714, and catalogued by Messier in 1764. The Andromeda Galaxy is a spiral galaxy approximately 2.5 million light-years away in the constellation Andromeda. It is visible with the naked ey ...
Chapter14- Our Galaxy - SFA Physics and Astronomy
... Many Messier objects are actually other galaxies ...
... Many Messier objects are actually other galaxies ...
The Milky Way Galaxy
... other spiral galaxies to help us predict its structure. 2 million light yrs. away ...
... other spiral galaxies to help us predict its structure. 2 million light yrs. away ...
Milky Way Galaxy Notes Outline
... What are two types of variable stars? How do they differ? (including luminosity and period) ...
... What are two types of variable stars? How do they differ? (including luminosity and period) ...
Unit 1: The Big Picture
... – Thought Milky Way made up entire universe until 1920s – Small fuzzy patches in telescopes appeared as nebulae, Latin for clouds – Edwin Hubble measured approximate distance to nearby Andromeda…no way Milky Way was that large – 3 Types: spiral, elliptical, irregular ...
... – Thought Milky Way made up entire universe until 1920s – Small fuzzy patches in telescopes appeared as nebulae, Latin for clouds – Edwin Hubble measured approximate distance to nearby Andromeda…no way Milky Way was that large – 3 Types: spiral, elliptical, irregular ...
Milky Way
... variable stars” in some of them. • Cepheids are evolved supergiant stars that brighten and fade periodically as their size oscillates. Remember, these are standard candles. • If Cepheids appear faint, then they must be way outside the Milky Way Galaxy. • From the distance and angular size of spiral ...
... variable stars” in some of them. • Cepheids are evolved supergiant stars that brighten and fade periodically as their size oscillates. Remember, these are standard candles. • If Cepheids appear faint, then they must be way outside the Milky Way Galaxy. • From the distance and angular size of spiral ...
Small Wonders: Andromeda
... debate (are there many galaxies or just one?) , and determining interstellar distances by the use of Cepheid variables. At the turn of the century, astronomers questions if the spiral nebula like M31 were ...
... debate (are there many galaxies or just one?) , and determining interstellar distances by the use of Cepheid variables. At the turn of the century, astronomers questions if the spiral nebula like M31 were ...
Week 5 (10/16) – Quiz #11
... Which of the following statements comparing our Sun to another star X located at the outer edge of the Milky Way galaxy is TRUE: ...
... Which of the following statements comparing our Sun to another star X located at the outer edge of the Milky Way galaxy is TRUE: ...
Great Migrations & other natural history tales
... (near-IR, in this case) but there’s no guarantee that the morphological type will be the same in the visible (here Hubble sequence is defined) and the other wavelengths. On the contrary, there are sometimes bars and rings which are revealed only in the UV, IR, or radio wavelengths. ...
... (near-IR, in this case) but there’s no guarantee that the morphological type will be the same in the visible (here Hubble sequence is defined) and the other wavelengths. On the contrary, there are sometimes bars and rings which are revealed only in the UV, IR, or radio wavelengths. ...
Organizing the cosmos
... It is visible as a faint smudge on a moonless night, it is one of the farthest objects visible to the naked eye, and can be seen even from urban areas with binoculars 2.3 million ly away ...
... It is visible as a faint smudge on a moonless night, it is one of the farthest objects visible to the naked eye, and can be seen even from urban areas with binoculars 2.3 million ly away ...
Galaxies - Physics
... • Visible amount of rotation over a few decades? • Continuous spectra • Hypothesis 1: Swirling clouds of fluid, possibly forming new solar systems • Hypothesis 2: “Island universes,” similar to our own Milky Way star system ...
... • Visible amount of rotation over a few decades? • Continuous spectra • Hypothesis 1: Swirling clouds of fluid, possibly forming new solar systems • Hypothesis 2: “Island universes,” similar to our own Milky Way star system ...
Andromeda Galaxy
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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.