Question 1

Active galaxies are the result of galactic _______________.

Accepted Answer

collisions,interacti

Question 2

In the unified model, an accretion disk viewed from the side will cause ____ to be present in the spectrum of a Seyfert galaxy.

Accepted Answer

A)  narrow absorption lines 
B)  broad absorption lines 
C)  narrow spectral lines 
D)  broad emission lines 
E)  no absorption lines 
A)  narrow absorption lines 
B)  broad absorption lines 
C)  narrow spectral lines 
D)  broad emission lines 
E)  no absorption lines

Question 3

Seyfert galaxies appear similar to normal spirals with extremely luminous cores.

Accepted Answer

A) True 
 B)False

Question 4

Gas falling into a black hole becomes ____.

Accepted Answer

A)  hot, due to an increase in speed and molecular collisions 
B)  hot, due to radiation from the black hole 
C)  compacted into solid matter by tidal forces. 
D)  cool, due tothe loss of gravitational energy. 
E)  cool, due tothe emission of infrared photons 
A)  hot, due to an increase in speed and molecular collisions 
B)  hot, due to radiation from the black hole 
C)  compacted into solid matter by tidal forces. 
D)  cool, due tothe loss of gravitational energy. 
E)  cool, due tothe emission of infrared photons

Question 5

Discuss the discovery of Seyfert galaxies and their observable properties.

Accepted Answer

Seyfert galaxies were first identified b

Question 6

Quasars ____.

Accepted Answer

A)  are common at all ages of the Universe 
B)  are the early stages of what become Seyfert galaxies 
C)  disrupt galactic formation and become isolated black holes 
D)  are an early stage of the formation of common galaxies 
E)  are formed from double-lobed radio galaxies 
A)  are common at all ages of the Universe 
B)  are the early stages of what become Seyfert galaxies 
C)  disrupt galactic formation and become isolated black holes 
D)  are an early stage of the formation of common galaxies 
E)  are formed from double-lobed radio galaxies

Question 7

Quasars are caused by galaxy collisions in the early Universe.

Accepted Answer

A) True 
 B)False

Question 8

Matter falling into a black hole converts _______________ energy into thermal energy.

Accepted Answer

The answer of Matter falling into a black hole converts...

Question 9

What is the unified model of active galactic nuclei? How does it explain differences in the continuous spectrum and emission lines of an active galactic nucleus?

Accepted Answer

A supermassive black hole is the centerp

Question 10

Why do astronomers believe that galactic collisions cause active galactic nuclei?

Accepted Answer

All galaxies are believed to contain sup

Question 11

Explain why the observable properties of quasars imply that they are objects from the early Universe controlled by supermassive black holes.

Accepted Answer

Quasars have continuous spectra with emi

Question 12

The motion of gas in accretion disks and jets is ____.

Accepted Answer

A)  well explained by Einstein's theory of general relativity 
B)  poorly understood, but may depend on magnetism 
C)  well explained by Kepler's laws. 
D)  poorly understood, but may depend on relativity 
E)  well explained by electromagnetic wave theory 
A)  well explained by Einstein's theory of general relativity 
B)  poorly understood, but may depend on magnetism 
C)  well explained by Kepler's laws. 
D)  poorly understood, but may depend on relativity 
E)  well explained by electromagnetic wave theory

Question 13

Quasars are common in the early Universe because ____ at that time.

Accepted Answer

A)  galactic collisions were more frequent 
B)  black hole collisions were more frequent 
C)  gas and dust clouds were denser 
D)  galaxies were more isolated 
E)  central bulges were larger 
A)  galactic collisions were more frequent 
B)  black hole collisions were more frequent 
C)  gas and dust clouds were denser 
D)  galaxies were more isolated 
E)  central bulges were larger

Question 14

How and when did supermassive black holes form?

Accepted Answer

The mass of a central black hole is rela

Question 15

Figure 17-12 (for the following questions)
Most quasars have a redshift of ____.

Accepted Answer

A)  less than 1.0 
B)  between 1.0 and 2.0 
C)  between 2.0 and 3.0 
D)  between 3.0 and 4.0 
E)  greater than 4.0 
A)  less than 1.0 
B)  between 1.0 and 2.0 
C)  between 2.0 and 3.0 
D)  between 3.0 and 4.0 
E)  greater than 4.0

Question 16

Seyfert galaxies are____

Accepted Answer

A)  spiral galaxies with unusually luminous nuclei 
B)  elliptical galaxies with very broad emission lines 
C)  explained by the double-exhaust model 
D)  extremely luminous objects with high redshifts only 
E)  glowing green gases due to excitation from energy from an active core 
A)  spiral galaxies with unusually luminous nuclei 
B)  elliptical galaxies with very broad emission lines 
C)  explained by the double-exhaust model 
D)  extremely luminous objects with high redshifts only 
E)  glowing green gases due to excitation from energy from an active core

Question 17

Why are active galaxies assumed to be associated with galactic collisions?

Accepted Answer

Galactic collisions transfer m

Question 18

A spiral galaxy with an extremely luminous, active core is called a(n) _______________ galaxy.

Accepted Answer

The answer of A spiral galaxy with an extremely luminous,...

Question 19

Matter falling into a black hole forms a(n) _______________ disk.

Accepted Answer

The answer of Matter falling into a black hole forms...

Question 20

Black holes erupt when matter flows into their accretion disk.

Accepted Answer

A) True 
 B)False

Exam 17: Supermassive Black Holes and Active Galaxies

Active galaxies are the result of galactic _______________.

In the unified model, an accretion disk viewed from the side will cause ____ to be present in the spectrum of a Seyfert galaxy.

Seyfert galaxies appear similar to normal spirals with extremely luminous cores.

Gas falling into a black hole becomes ____.

Discuss the discovery of Seyfert galaxies and their observable properties.

Quasars ____.

Quasars are caused by galaxy collisions in the early Universe.

Matter falling into a black hole converts _______________ energy into thermal energy.

What is the unified model of active galactic nuclei? How does it explain differences in the continuous spectrum and emission lines of an active galactic nucleus?

Why do astronomers believe that galactic collisions cause active galactic nuclei?

Explain why the observable properties of quasars imply that they are objects from the early Universe controlled by supermassive black holes.

The motion of gas in accretion disks and jets is ____.

Quasars are common in the early Universe because ____ at that time.

How and when did supermassive black holes form?

Figure 17-12 (for the following questions) Most quasars have a redshift of ____.

Seyfert galaxies are____

Why are active galaxies assumed to be associated with galactic collisions?

A spiral galaxy with an extremely luminous, active core is called a(n) _______________ galaxy.

Matter falling into a black hole forms a(n) _______________ disk.

Black holes erupt when matter flows into their accretion disk.

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