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Stars and Galaxies Exam
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Stars and Galaxies Exam
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25 Questions

1. dictates the maximum luminosity of an object | if the object is compact, the limit is dependent upon the mass of the object

2. 13 million lightyears away | a starburst galaxy | possibly a merger of a spiral and elliptical galaxy

3.
This is

4. the Milky Way has 15 to 30 satellite galaxies | most are small | most are dwarf ellipticals | they help compost the 'corona' of the galaxy

5.
This is

6. if a body collapses too far, then it will collapse beyond the Schwarzschild radius | it then becomes a black hole

7.
This is

8. it is unseen | all galaxies show the presence of dark matter | it's halo comprises 90% of the galaxy's mass | it extends far beyond the visible halo | neutrinos may be a component of this | dark matter appears to interact only with the gravitational force

9. the interstellar medium can be mapped in the local vicinity by the 21cm radiation | this shows a local bubble of hot, thin IM gas

10. called Blazars because the core of the galaxy blazes so brightly | the core is star-like and variable

11.
This is

12. 1. self propagating star formation | 2. spiral density waves

13. both broad and narrow emission lines, with the H lines broader than other emission lines

14. in the 1940s, Carl Seyfert finds several galaxies that have unusual cores | the cores of these galaxies are bright and star-like | they emit nearly 30% of their light as emission lines

15.
This is

16. small black holes evaporate in minutes

17. in 1919, sir arthur eddington measured the displacement of stars during an eclipse

18. some galaxies were found to emit a great deal of energy in radio wavelengths | the emitted energy comes from giant lobes extending great distances from the host galaxy

19. American Astronomer | discovered that all of the spiral nebulae that he measured were highly red shifted | he argued that they were extragalactic and moving away from the Milky Way

20. high velocity clouds streaming from the Magellanic Clouds

21. the mass of the galaxy can be determined by using Kepler's Laws | this can be used to determine the galaxy's mass profile, too

22.
This is

23. a collapse / a blackhole is formed

24. the Milky Way's rotation curve indicates that there is more mass in the galaxy than can be accounted for by observations

25. small galaxies orbiting larger ones tend to spiral into larger galaxies | indications are that the Milky Way has already absorbed several smaller companions

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