Question 1

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 4.0F) A) and C)
G) A) and E)

Question 2

Supermassive black holes are very large, the most massive even larger than our Solar System.

Accepted Answer

A) True 
 B)False

Question 3

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 coreF) D) and E)
G) A) and B)

Question 4

Supermassive black holes erupt in ____.

Accepted Answer

A)   any type of galaxy, and at random times
B)   elliptical galaxies only, when the last of their gas and dust is consumed
C)   galaxies that have been part of a collision or merger
D)   spiral galaxies only, during a burst of star formation
E)   irregular galaxiesF) C) and D)
G) A) and B)

Question 5

Why are rapid fluctuations in an active galaxy's luminosity evidence for a supermassive black hole?

Accepted Answer

Rapid fluctuations must come from a very small source. The only object that can be luminous and massive enough within the small spaces implied is a black hole.

Question 6

A supermassive black hole erupts when ____.

Accepted Answer

A)   i t collides with a neutron star
B)   magnetic fields form tubes to channel the jets
C)   the accretion disk tilts to a new angle
D)   a sudden flood of matter flows inward producingan accretion disk
E)   starburst events irradiate the accretion disk with new energyF) B) and E)
G) D) and E)

Question 7

Active galaxies are the result of galactic _______________.

Accepted Answer

collisions,interacti...

Question 8

Active galaxies are believed to be the product of collisions and interactions because ____.

Accepted Answer

A)   they are always seen in contact with another galaxy
B)   the transfer of matter would explain the black hole eruption
C)   the collision of individual stars would explain the black hole eruption
D)   central bulges are formed by collisions
E)   supermassive black holes are necessary for galactic collisionsF) D) and E)
G) A) and E) B

Question 9

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

Accepted Answer

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

Question 10

What produces the lobes in double-lobed radio galaxies?

Accepted Answer

A)   an accretion disk
B)   a starburst event
C)   black-hole jets
D)   synchrotron radiation
E)   high redshiftsF) A) and E)
G) A) and C)

Question 11

Active galactic nuclei were first found through observations in the ____ wavelength band.

Accepted Answer

A)   visible
B)   infrared
C)   X-ray
D)   radio
E)   ultravioletF) B) and C)
G) C) and E)

Question 12

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 galaxiesF) B) and E)
G) None of the above D

Question 13

A unified model of active galaxy cores can explain different types of Seyfert galaxies, quasars and other active galaxy types by differences in the ____.

Accepted Answer

A)   mass of the supermassive black hole
B)   size and thickness of the accretion disk
C)   magnetic flux strength in the jets
D)   amount of dust in the accretion disk
E)   tilt of the accretion disk to the line of sightF) A) and E)
G) All of the above

Question 14

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 15

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 linesF) A) and B)
G) B) and E)

Question 16

The size of a galaxy's central black hole is proportional to the mass of its disk.

Accepted Answer

A) True 
 B)False

Question 17

Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____.

Accepted Answer

A)   have supermassive black holes
B)   are colliding with other galaxies
C)   create jets
D)   have large redshifted spectra
E)   have a fluctuating luminosityF) B) and E)
G) D) and E)

Question 18

Supermassive black holes have weaker gravity than stellar-mass black holes, producing slower spins for the infalling matter.

Accepted Answer

A) True 
 B)False

Question 19

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 photonsF) A) and E)
G) D) and E)

Question 20

What two things are unusual about the luminosity of the core of a Seyfert galaxy?

Accepted Answer

The core of a Seyfert galaxy i...

Exam 17: Supermassive Black Holes and Active Galaxies

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

Correct AnswerverifiedShow Answer

Supermassive black holes are very large, the most massive even larger than our Solar System.

Correct AnswerverifiedShow Answer

Seyfert galaxies are____

Correct AnswerverifiedShow Answer

Supermassive black holes erupt in ____.

Correct AnswerverifiedShow Answer

Why are rapid fluctuations in an active galaxy's luminosity evidence for a supermassive black hole?

Correct AnswerverifiedRapid fluctuations must come from a very small source. The only object that can be luminous and massive enough within the small spaces implied is a black hole.

A supermassive black hole erupts when ____.

Correct AnswerverifiedShow Answer

Active galaxies are the result of galactic _______________.

Correct Answerverifiedcollisions,interacti...View AnswerShow Answer

Active galaxies are believed to be the product of collisions and interactions because ____.

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

What produces the lobes in double-lobed radio galaxies?

Correct AnswerverifiedShow Answer

Active galactic nuclei were first found through observations in the ____ wavelength band.

Correct AnswerverifiedShow Answer

Quasars ____.

Correct AnswerverifiedD

A unified model of active galaxy cores can explain different types of Seyfert galaxies, quasars and other active galaxy types by differences in the ____.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedA supermassive black hole is the centerp...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

The size of a galaxy's central black hole is proportional to the mass of its disk.

Correct AnswerverifiedShow Answer

Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____.

Correct AnswerverifiedShow Answer

Supermassive black holes have weaker gravity than stellar-mass black holes, producing slower spins for the infalling matter.

Correct AnswerverifiedShow Answer

Gas falling into a black hole becomes ____.

Correct AnswerverifiedShow Answer

What two things are unusual about the luminosity of the core of a Seyfert galaxy?

Correct AnswerverifiedThe core of a Seyfert galaxy i...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Rapid fluctuations must come from a very small source. The only object that can be luminous and massive enough within the small spaces implied is a black hole.

Correct Answer
verified

Correct Answer
verified
collisions,interacti...
View Answer

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified
A supermassive black hole is the centerp...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The core of a Seyfert galaxy i...
View Answer