Question 1

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 collisions 
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 collisions B

Question 2

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 3

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 D

Question 4

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 5

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

Accepted Answer

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

Question 6

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 7

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

Accepted Answer

A) True 
 B)False

Question 8

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

Question 9

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 10

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

Question 11

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 12

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

Accepted Answer

A) True 
 B)False

Question 13

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 galaxies 
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 galaxies

Question 14

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

Accepted Answer

A)  visible 
B)  infrared 
C)  X-ray 
D)  radio 
E)  ultraviolet 
A)  visible 
B)  infrared 
C)  X-ray 
D)  radio 
E)  ultraviolet

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

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

Accepted Answer

The core of a Seyfert galaxy i

Question 17

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 18

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 energy 
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 energy

Question 19

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 sight 
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 sight

Question 20

Active galaxies are the result of galactic _______________.

Accepted Answer

collisions,interacti

Exam 17: Supermassive Black Holes and Active Galaxies

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

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

Quasars ____.

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

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

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?

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

What produces the lobes in double-lobed radio galaxies?

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

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

Gas falling into a black hole becomes ____.

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

Supermassive black holes erupt in ____.

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

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

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

Seyfert galaxies are____

A supermassive black hole erupts when ____.

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

Active galaxies are the result of galactic _______________.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

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Atoms and Spectra

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The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

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Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

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