Term
| which of the following is not one of Hubbles types of galaxies |
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Definition
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Term
| in active galaxies their central energies may be temporarily fed by |
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Definition
| a close encounter with a neighbor galaxy |
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Term
| according to hubbles law, a galaxy with velocity of 25,000 kms/s will be |
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Definition
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Term
| when a mass is accreted into a black hole, how much total mas-energy can be radiated away |
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Definition
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Term
| the astronomer who originally classified galaxies into S>E and Irr was |
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Definition
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Term
| the flattest of all galaxies belongs to class |
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Definition
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Term
| what is true of the lobes of a radio galaxy |
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Definition
| they are perpendicular to the galactic plane |
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Term
| which property is common to spiral galaxies |
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Definition
| ongoing star formation and emission nebula in the arms |
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Term
| the flattest of the ellipticals are class |
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Definition
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Term
| what are Type I supernova used for |
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Definition
| standard candles for determining distances to other galaxies |
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Term
| not only does the central engine of active galaxies and quasars require a black hole, but also ______ to provide the radiate energy |
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Definition
| an accertion disk of infalling matter |
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Term
| in this diagram the galaxy at the left side is |
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Definition
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Term
| a galaxy with little cool gas or dust and no evidence of ongoing star formation is most likely an |
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Definition
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Term
| Synchrotron radiation produces a _________ spectrum |
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Definition
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Term
| according to hubbles law, the greater a galaxy redshift, the |
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Definition
| farther that it is from us |
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Term
| the milky way is often considered to be an intermediately barred spiral, which would be type _______ |
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Definition
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Term
| in shape and component starts, elliptical galaxies are most like our own |
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Definition
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Term
| which type of galaxy has a stellar disk but without gas ad dust |
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Definition
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Term
| compared to our own galaxy, elliptical galaxies |
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Definition
| show no evidence of ongoing star formation |
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Term
| what is true of the local group |
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Definition
| the Andromeda galaxy (M31) and the milky way are the two largests galaxies |
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Term
| which of these would be made up only population II stars? |
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Definition
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Term
| the Tully-fisher relation exists between the galaxy's luminosity and its |
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Definition
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Term
| why is the energy source for active nuclei like Sayfers thought to be compact |
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Definition
| the light can vary over short time intervals |
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