Question 1

When they were first discovered, quasars appeared to be____.

Accepted Answer

A)  small, star-like objects associated with radio emission 
B)  pairs of radio sources 
C)  elliptical galaxies with an X-ray emitting halo 
D)  clouds of gas glowing with green emission lines 
E)  linear jets of matter 
A)  small, star-like objects associated with radio emission 
B)  pairs of radio sources 
C)  elliptical galaxies with an X-ray emitting halo 
D)  clouds of gas glowing with green emission lines 
E)  linear jets of matter A

Question 2

The luminosity of a Seyfert galaxy varies with a regular period of months or years.

Accepted Answer

A) True 
 B)False  False

Question 3

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 C

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 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 6

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 7

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

Accepted Answer

A) True 
 B)False

Question 8

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 9

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 10

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 11

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

Accepted Answer

Rapid fluctuations must come f

Question 12

Why do astronomers conclude that quasars are very far away?

Accepted Answer

The spectra of quasars have ve

Question 13

Quasars are radio sources that look like stars in visible-light photographs.

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

What is the best description of Hanny's Voorwerp?

Accepted Answer

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

Question 16

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 17

Many galaxies with erupting black holes are found ____.

Accepted Answer

A)  in poor clusters with little intergalactic gas 
B)  isolated in space 
C)  in one of a pair of orbiting galaxies 
D)  very close to the Milky Way galaxy 
E)  in the Local Group 
A)  in poor clusters with little intergalactic gas 
B)  isolated in space 
C)  in one of a pair of orbiting galaxies 
D)  very close to the Milky Way galaxy 
E)  in the Local Group

Question 18

Quasars 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 19

Active galaxies were first discovered by observations in the _______________ wavelength band.

Accepted Answer

The answer of Active galaxies were first discovered by observations...

Question 20

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

Exam 17: Supermassive Black Holes and Active Galaxies

When they were first discovered, quasars appeared to be____.

The luminosity of a Seyfert galaxy varies with a regular period of months or years.

What produces the lobes in double-lobed radio galaxies?

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

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

The high luminosity of a Seyfert galaxy____.

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

The energy output of a Seyfert galaxy____.

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

A supermassive black hole erupts when ____.

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

Why do astronomers conclude that quasars are very far away?

Quasars are radio sources that look like stars in visible-light photographs.

Seyfert galaxies are always ____ galaxies.

What is the best description of Hanny's Voorwerp?

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

Many galaxies with erupting black holes are found ____.

Quasars are____.

Active galaxies were first discovered by observations in the _______________ wavelength band.

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

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