STUDY QUESTIONS #10 The MILKY WAY GALAXY diameter face
... 9. Using the rotation curve above, astronomers have calculated a mass for the whole Galaxy, out to about 50,000 light-year radius where there are no more stars, to be about 2 × 1011 M , yet by measuring light at all wavelengths, they only measure one sixth of that mass (3 × 1010 M ). Using the orbit ...
... 9. Using the rotation curve above, astronomers have calculated a mass for the whole Galaxy, out to about 50,000 light-year radius where there are no more stars, to be about 2 × 1011 M , yet by measuring light at all wavelengths, they only measure one sixth of that mass (3 × 1010 M ). Using the orbit ...
Handout from Allaire Star Party
... One of the nebulae visible in the fall is the Eagle Nebula, M16, in the constellation Serpens. M16 is 7,000 light years away and has 3 huge “pillars” of dark dust that are silhouetted against the nebula in the background. One of the most famous Hubble images depicts these “Pillars of Creation” and s ...
... One of the nebulae visible in the fall is the Eagle Nebula, M16, in the constellation Serpens. M16 is 7,000 light years away and has 3 huge “pillars” of dark dust that are silhouetted against the nebula in the background. One of the most famous Hubble images depicts these “Pillars of Creation” and s ...
Where do you find yourself now??
... The second richest cluster in this volume of space is the Fornax Cluster, but it is not nearly as rich as the Virgo cluster. Only bright galaxies are depicted on the map, our galaxy is the dot in the very centre. ...
... The second richest cluster in this volume of space is the Fornax Cluster, but it is not nearly as rich as the Virgo cluster. Only bright galaxies are depicted on the map, our galaxy is the dot in the very centre. ...
Practice Questions for Final
... Which of the following does NOT support the theory that active galactic nuclei are powered by accretion disks around massive black holes? A. Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed. B. The total amount of radiation coming f ...
... Which of the following does NOT support the theory that active galactic nuclei are powered by accretion disks around massive black holes? A. Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed. B. The total amount of radiation coming f ...
![Galaxies[1] - salendinenookphysics](http://s1.studyres.com/store/data/008083907_1-b5969f7f2ab35a1d0e21378b751ce81e-300x300.png)
Scale and Structure of the Universe
... in space. We are not sure what it is. It is not like matter on Earth. It is not a liquid, solid or gas. The only way we know it is there is because it seems to create gravitational pull on other structures out in space. ...
... in space. We are not sure what it is. It is not like matter on Earth. It is not a liquid, solid or gas. The only way we know it is there is because it seems to create gravitational pull on other structures out in space. ...
Document
... 3. Does not appear to be a large population of HI clouds with no optical counterparts. 4. Dwarf (mainly dE/dSph) galaxies with red colours found in large numbers in the cluster. They are gas poor, but are they stripped of their gas? 5. Low numbers of dwarf (dI) galaxies with blue colours and gas ric ...
... 3. Does not appear to be a large population of HI clouds with no optical counterparts. 4. Dwarf (mainly dE/dSph) galaxies with red colours found in large numbers in the cluster. They are gas poor, but are they stripped of their gas? 5. Low numbers of dwarf (dI) galaxies with blue colours and gas ric ...
The extragalactic universe and distance measurements
... – Realized that the Milky Way is a disk of stars containing the solar system – a galaxy – Kant suggested that there were other galaxies like the Milky Way – He supposed that these galaxies cluster in groups of ever increasing scale, filling all of space. – But, where were these other galaxies? ...
... – Realized that the Milky Way is a disk of stars containing the solar system – a galaxy – Kant suggested that there were other galaxies like the Milky Way – He supposed that these galaxies cluster in groups of ever increasing scale, filling all of space. – But, where were these other galaxies? ...
Answers for the HST Scavenger Hunt
... A barred spiral galaxy has a “bar” of stars and interstellar matter, such as dust and gas, slicing across its center. A typical spiral galaxy has a spherical central bulge of older stars surrounded by a flattened galactic disk. ...
... A barred spiral galaxy has a “bar” of stars and interstellar matter, such as dust and gas, slicing across its center. A typical spiral galaxy has a spherical central bulge of older stars surrounded by a flattened galactic disk. ...
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 ...
Messier 87
Messier 87 (also known as Virgo A or NGC 4486, and generally abbreviated to M87) is a supergiant elliptical galaxy in the constellation Virgo. One of the most massive galaxies in the local universe, it is notable for its large population of globular clusters—M87 contains about 12,000 compared to the 150-200 orbiting the Milky Way—and its jet of energetic plasma that originates at the core and extends outward at least 1,500 parsecs (4,900 light-years), travelling at relativistic speed. It is one of the brightest radio sources in the sky, and is a popular target for both amateur astronomy observations and professional astronomy study.French astronomer Charles Messier discovered M87 in 1781, cataloguing it as a nebulous feature while searching for objects that would confuse comet hunters. The second brightest galaxy within the northern Virgo Cluster, M87 is located about 16.4 million parsecs (53.5 million light-years) from Earth. Unlike a disk-shaped spiral galaxy, M87 has no distinctive dust lanes. Instead, it has an almost featureless, ellipsoidal shape typical of most giant elliptical galaxies, diminishing in luminosity with distance from the centre. Forming around one sixth of M87's mass, the stars in this galaxy have a nearly spherically symmetric distribution, their density decreasing with increasing distance from the core. At the core is a supermassive black hole, which forms the primary component of an active galactic nucleus. This object is a strong source of multiwavelength radiation, particularly radio waves. M87's galactic envelope extends out to a radius of about 150 kiloparsecs (490,000 light-years), where it has been truncated—possibly by an encounter with another galaxy. Between the stars is a diffuse interstellar medium of gas that has been chemically enriched by elements emitted from evolved stars.