Question 1

The energy output of a Seyfert galaxy____.

Accepted Answer

A)  changes slowly with a period of weeks 
B)  is a hundred times the luminosity of the entire Milky Way 
C)  is noticeable only in the infrared 
D)  comes from starburst effects 
E)  is concentrated in the spiral arms 
A)  changes slowly with a period of weeks 
B)  is a hundred times the luminosity of the entire Milky Way 
C)  is noticeable only in the infrared 
D)  comes from starburst effects 
E)  is concentrated in the spiral arms

Question 2

Seyfert galaxies____.

Accepted Answer

A)  often have unique shapes spectra suggesting fast-moving, hot gas 
B)  have no gas and dust in their spiral arms 
C)  are associated with pairs of radio sources 
D)  have visible jets of matter coming from their cores 
E)  are always isolated galaxies 
A)  often have unique shapes spectra suggesting fast-moving, hot gas 
B)  have no gas and dust in their spiral arms 
C)  are associated with pairs of radio sources 
D)  have visible jets of matter coming from their cores 
E)  are always isolated galaxies

Question 3

Double-lobed radio galaxies are an effect of black hole jets.

Accepted Answer

A) True 
 B)False

Question 4

Black hole jets are believed to be focused and confined by the enclosing magnetic _______________.

Accepted Answer

The answer of Black hole jets are believed to be...

Question 5

A galaxy's supermassive black hole represents about ____ for elliptical galaxies.

Accepted Answer

A)  half a percent of the mass of the disk 
B)  five percent of the mass of the central bulge 
C)  half a percent of the mass of the central bulge 
D)  five percent of the mass of the disk 
E)  half a percent of the dark matter in the corona 
A)  half a percent of the mass of the disk 
B)  five percent of the mass of the central bulge 
C)  half a percent of the mass of the central bulge 
D)  five percent of the mass of the disk 
E)  half a percent of the dark matter in the corona

Question 6

What is the cause of the lobes in a double-lobed radio galaxy?

Accepted Answer

Jets from a central

Question 7

Double-lobed radio 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 
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 
E)  glowing green gases due to excitation from energy from an active core

Question 8

The formation process for supermassive black holes is linked with the formation of galactic ____.

Accepted Answer

A)  disks 
B)  clusters 
C)  central bulges 
D)  coronae 
E)  halos 
A)  disks 
B)  clusters 
C)  central bulges 
D)  coronae 
E)  halos

Question 9

Figure 17-12 (for the following questions) The accompanying graph shows that quasars formed ____.

Accepted Answer

A)  starting after the formation of the Universe and peaking long ago, with almost none occurring today 
B)  just after the formation of the Universe, dropping steadily to none occurring today 
C)  steadily through time from the early Universe until today 
D)  after the formation of the Universe, with more and more occurring over time 
E)  long after the formation of the Universe, peaking before the present day 
A)  starting after the formation of the Universe and peaking long ago, with almost none occurring today 
B)  just after the formation of the Universe, dropping steadily to none occurring today 
C)  steadily through time from the early Universe until today 
D)  after the formation of the Universe, with more and more occurring over time 
E)  long after the formation of the Universe, peaking before the present day

Question 10

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 11

The structure of black hole jets is believed to be controlled by magnetism.

Accepted Answer

A) True 
 B)False

Question 12

Discuss the discovery of Seyfert galaxies and their observable properties.

Accepted Answer

Seyfert galaxies were first identified b

Question 13

Matter flowing into a black hole cools until it is accelerated into a jet.

Accepted Answer

A) True 
 B)False

Question 14

Seyfert galaxies are always ____ galaxies.

Accepted Answer

A)  dwarf 
B)  irregular 
C)  spiral 
D)  elliptical 
E)  flocculent 
A)  dwarf 
B)  irregular 
C)  spiral 
D)  elliptical 
E)  flocculent

Question 15

Why do astronomers conclude that quasars are very far away?

Accepted Answer

The spectra of quasars have ve

Question 16

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

Accepted Answer

Galactic collisions transfer m

Question 17

The high luminosity of a Seyfert galaxy____.

Accepted Answer

A)  comes from the halo of the galaxy 
B)  is distributed through the spiral arms 
C)  is spread through the central bulge 
D)  is concentrated in a very small region of the nucleus 
E)  varies over the course of years 
A)  comes from the halo of the galaxy 
B)  is distributed through the spiral arms 
C)  is spread through the central bulge 
D)  is concentrated in a very small region of the nucleus 
E)  varies over the course of years

Question 18

The Doppler effect in the spectra of quasars show very high _______________.

Accepted Answer

red shifts

Question 19

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

Accepted Answer

All galaxies are believed to contain sup

Question 20

Quasars are isolated supermassive black holes, and not associated with galaxies.

Accepted Answer

A) True 
 B)False

Exam 17: Supermassive Black Holes and Active Galaxies

The energy output of a Seyfert galaxy____.

Seyfert galaxies____.

Double-lobed radio galaxies are an effect of black hole jets.

Black hole jets are believed to be focused and confined by the enclosing magnetic _______________.

A galaxy's supermassive black hole represents about ____ for elliptical galaxies.

What is the cause of the lobes in a double-lobed radio galaxy?

Double-lobed radio galaxies are____.

The formation process for supermassive black holes is linked with the formation of galactic ____.

Figure 17-12 (for the following questions) The accompanying graph shows that quasars formed ____.

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

The structure of black hole jets is believed to be controlled by magnetism.

Discuss the discovery of Seyfert galaxies and their observable properties.

Matter flowing into a black hole cools until it is accelerated into a jet.

Seyfert galaxies are always ____ galaxies.

Why do astronomers conclude that quasars are very far away?

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

The high luminosity of a Seyfert galaxy____.

The Doppler effect in the spectra of quasars show very high _______________.

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

Quasars are isolated supermassive black holes, and not associated with galaxies.

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A Users Guide to the Sky

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Origins of Modern Astronomy

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