Because of gravitational lensing, we know that most of the mass of a galaxy is: A....
Because of gravitational lensing, we know that most of the mass of a galaxy is:
A. exotic dark matter
B. MACHOs
Homework Answers
A - Dark Matter
Reason - Gravitational lensing occurs when there is a lot of mass like cluster of galaxies between us and the target like a galaxy that is behind the cluster. From light coming from all the galaxies, we can find how much stellar mass the galaxies in the cluster must have. Then we can compute the difference in mass due to gravity and this stellar mass. We will notice that most of the mass is missing means light has not passed through that, so this means there is something but not observable.
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Because of gravitational lensing, we know that most of the mass
of a galaxy is:
A....
Galaxies contain both stars and dark matter. The mass M of a galaxy that is located...
Galaxies contain both stars and dark matter. The mass M of a galaxy that is located within a certain star's orbit is given by where v is the velocity of the star, r is the distance from the galaxy's center to the star, and G is Newton's gravitational constant, 6.673 x 10- N m/kg Stars near the edge of a particular galaxy have velocities of 259 km/s. The radius of the galaxy is 53 kpc. How much mass is in...
LP 5. (20 pts) It is known that most of the mass of galaxies is some exotic material that doesn't interact with light or normal matter. Let's assume that this "dark matter" is due...
LP 5. (20 pts) It is known that most of the mass of galaxies is some exotic material that doesn't interact with light or normal matter. Let's assume that this "dark matter" is due to a new elementary particle---alaskonium. Like Alaska in the winter, alaskonium in the galaxy is cold and dark. We will assume that alaskonium is a fermion and that it is so cold that it is degenerate; a gravitationally bound, nonrelativistic, degenerate gas. Take the total mass...
We used velocity dispersion and average distance between galaxies in the cluster to determine the virial mass, and we used the number of galaxies and the average mass of a galaxy to determine luminous...
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I am looking into the effects of gravitational lensing of gravitational waves. I know that gravitons...
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Measurements of the mass distribution in the Universe indicate that it is composed of both ordinary...
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The cluster of galaxies creates a gravitational lens for a background galaxy, forming an Einstein ring....
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Galaxies contain both stars and dark matter. The mass M of a galaxy that is located within a certain star's orbit is given by where v is the velocity of the star, r is the distance from the galaxy's center to the star, and G is Newton's gravitational constant, 6.673 x 10- N m/kg Stars near the edge of a particular galaxy have velocities of 259 km/s. The radius of the galaxy is 53 kpc. How much mass is in...
LP 5. (20 pts) It is known that most of the mass of galaxies is some exotic material that doesn't interact with light or normal matter. Let's assume that this "dark matter" is due to a new elementary particle---alaskonium. Like Alaska in the winter, alaskonium in the galaxy is cold and dark. We will assume that alaskonium is a fermion and that it is so cold that it is degenerate; a gravitationally bound, nonrelativistic, degenerate gas. Take the total mass...
Answer the questions below by assuming the spherical mass distribution of dark matter in our Galaxy, where the Galactic radius is 100,000 light years, the distance of the solar system from the center is 27,000 light years, and the constant orbital speed of stars is 220 km s1. Use the gravitational constant 6.674 x 10-11 N m2 kg2, light year 9.46 x 1015 m, and solar mass 2.0 x 1030 kg. 1. show the mass of dark matter inside radius...
Measurements of the mass distribution in the Universe indicate that it is composed of both ordinary matter and dark matter. Identify which force interacts with which type of matter. Ordinary matter only Dark matter only Ordinary and dark matter Answer Bank gravitational electromagnetic The presence of dark matter was first implied by its interaction with ordinary matter through which force? We were unable to transcribe this image
2. Mass versus Light One of the primary goals of every galaxy survey is to measure the distribution of the luminosities of galaxies, which has been found to be well parameterized by the luminosity function L/L- where φ(L)dL is the number density of galaxies with luminosity between L and L + dL, and φ*, L*, and a are parameters to be determined from galaxy surveys (a) Show that the luminosity density of galaxies, J, is related to ф*, L*, and...
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