astro final 3

astro final 3 - 1. The globular clusters in our Galaxy are...

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1. The globular clusters in our Galaxy are roughly spherically distributed around: a. the Sun b. a point that is about 8.5 kpc from us in the direction of Sagittarius c. a point that is about 8.5 kpc from us in the direction of Orion d. a black hole, 2 kpc away from the Sun e. a nearby spiral arm 2. O-type and B-type stars in our Galaxy are usually located in: a. the halo of the Galaxy b. the bulge of the Galaxy c. the spiral arms of the Galaxy d. the globular clusters of the Galaxy e. uniformly distributed throughout the Galaxy 3. Which term does not belong with the others? a. bulge b. disk c. halo d. spiral arm e. supernova 4. What is the classification of our Galaxy (the Milky Way)? a. Spiral b. Elliptical c. Lenticular (S0) d. Irregular Type I e. Irregular Type II 5. The rotation curve of our Galaxy at large distances from the center is constant (flat), indicating that: a. Our Galaxy is a spiral galaxy. b. Our Galaxy has a great deal of dark matter. c. The material in our Galaxy is mostly concentrated in its center. d. Our Galaxy has a massive black hole in the center that accounts for 99% of its mass. e. The material in our Galaxy is uniformly distributed between its center and its edge.
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6. A galaxy that has very little gas and dust, stars of low mass and temperature, no rotation, and circular shape is a(n): a. E0 galaxy b. E7 galaxy c. S0 galaxy d. SBa galaxy e. Sa galaxy 7. When two galaxies collide: a. They destroy each other's stars. b. They pass through each other without any effects to either galaxy. c. They distort each other's shapes by gravitational tidal interactions. d. They merge into a giant black hole. e. Actually, galaxy collisions never happen, since galaxies are so far apart and moving so slowly. 8. How do astronomers measure the total mass of an elliptical galaxy? a. By measuring the rotation curve of the galaxy, from which its mass can be determined. b. By measuring the velocity dispersion as a function of radius for the galaxy, from which its total mass can be determined. c. By measuring the orbital velocities of molecular clouds outside of the galaxy. d. By measuring the neutrino flux from the galaxy. e. By measuring the size of the galaxy and applying the size-mass relationship for elliptical galaxies. 9. Which of the following techniques is used by astronomers to discover dark matter in the form of cool white dwarfs, brown dwarfs, or neutron stars in the halo of the Milky Way? a. looking for dark spots against the stellar background b. looking for pulsating radio sources c. looking for pulsating sources of gravitational waves d. looking for regions where the stars have much higher heavy element abundance than average e. looking for stellar brightening by gravitational lensing
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10. Which observation suggests that the Milky Way is a disk galaxy? a. The stars of the Milky Way have about 2% heavy element abundance.
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This note was uploaded on 04/03/2008 for the course ASTRO 109 taught by Professor Piatek during the Spring '07 term at Rutgers.

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astro final 3 - 1. The globular clusters in our Galaxy are...

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