Question 1

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 2

The unified model of active galactic nuclei focuses on differences caused by the age of the central black hole.

Accepted Answer

A) True 
 B)False

Question 3

Matter falling into a black hole arranges itself in the shape of a ____.

Accepted Answer

A)  spherical shell that is thick at the edges and thin closer to the center 
B)  spherical shell that is thin at the edges and thick closer to the center 
C)  disk that is thick at the outer edge, thin along the inner ring 
D)  disk that is thin at the outer edge and thick closer to the center 
E)  disk that is thin from the outer edge to the center 
A)  spherical shell that is thick at the edges and thin closer to the center 
B)  spherical shell that is thin at the edges and thick closer to the center 
C)  disk that is thick at the outer edge, thin along the inner ring 
D)  disk that is thin at the outer edge and thick closer to the center 
E)  disk that is thin from the outer edge to the center

Question 4

Collisions in the early Universe were rare.

Accepted Answer

A) True 
 B)False

Question 5

Quasars have a(n) ____.

Accepted Answer

A)  extremely high blueshift 
B)  moderate blueshift 
C)  undetectable Doppler shift 
D)  moderate redshift 
E)  extremely high redshift 
A)  extremely high blueshift 
B)  moderate blueshift 
C)  undetectable Doppler shift 
D)  moderate redshift 
E)  extremely high redshift

Question 6

How and when did supermassive black holes form?

Accepted Answer

The mass of a central black hole is rela

Question 7

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 8

Quasars are caused by galaxy collisions in the early Universe.

Accepted Answer

A) True 
 B)False

Question 9

Ultraluminous radio sources associated with small visible-light objects are called _______________.

Accepted Answer

The answer of Ultraluminous radio sources associated with small visible-light...

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

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

Question 14

A supermassive black hole that is erupting____.

Accepted Answer

A)  will consume all gas and dust in the galaxy 
B)  will heat the gas in the cluster until it all escapes 
C)  is fed by the intergalactic gas of the cluster 
D)  may push its accretion disk away and choke off the eruption 
E)  will push other galaxies away from its parent galaxy 
A)  will consume all gas and dust in the galaxy 
B)  will heat the gas in the cluster until it all escapes 
C)  is fed by the intergalactic gas of the cluster 
D)  may push its accretion disk away and choke off the eruption 
E)  will push other galaxies away from its parent galaxy

Question 15

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 16

The broad emission lines of Seyfert galaxies imply high gas speeds in the nucleus.

Accepted Answer

A) True 
 B)False

Question 17

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 18

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

Accepted Answer

A) True 
 B)False

Question 19

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 20

Different types of active galaxies are caused by different orientations of the central black hole's _______________.

Accepted Answer

The answer of Different types of active galaxies are caused...

Exam 17: Supermassive Black Holes and Active Galaxies

Quasars are____.

The unified model of active galactic nuclei focuses on differences caused by the age of the central black hole.

Matter falling into a black hole arranges itself in the shape of a ____.

Collisions in the early Universe were rare.

Quasars have a(n) ____.

How and when did supermassive black holes form?

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

Quasars are caused by galaxy collisions in the early Universe.

Ultraluminous radio sources associated with small visible-light objects are called _______________.

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

When they were first discovered, quasars appeared to be____.

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

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

A supermassive black hole that is erupting____.

Many galaxies with erupting black holes are found ____.

The broad emission lines of Seyfert galaxies imply high gas speeds in the nucleus.

What is the best description of Hanny's Voorwerp?

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

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

Different types of active galaxies are caused by different orientations of the central black hole's _______________.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

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The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

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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