Question 1

In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is

Accepted Answer

A) composed of clouds of gas and stars moving at very high orbital velocities near a supermassive black hole. 
B) composed of a supermassive black hole surrounded by empty space. 
C) responsible for producing the bright continuous radiation from within the event horizon. 
D) responsible for the narrow absorption lines seen in Type 2 Seyfert galaxies. 
E) located far from the core beyond the disk of stars of the galaxy. 
A) composed of clouds of gas and stars moving at very high orbital velocities near a supermassive black hole. 
B) composed of a supermassive black hole surrounded by empty space. 
C) responsible for producing the bright continuous radiation from within the event horizon. 
D) responsible for the narrow absorption lines seen in Type 2 Seyfert galaxies. 
E) located far from the core beyond the disk of stars of the galaxy.

Question 2

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

Accepted Answer

A) True 
 B)False

Question 3

The above visual wavelength image suggests that star formation is currently occurring.

Accepted Answer

A) True 
 B)False

Question 4

The hydrogen Balmer line Hβ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the change in wavelength (in nm) of this quasar Is it a "redshift" or "blueshift"

Accepted Answer

A) 0; no change 
B) 2430.5; redshift 
C) 486.1; blue shift 
D) 1944.4; blueshift 
E) 1944.4; redshift 
A) 0; no change 
B) 2430.5; redshift 
C) 486.1; blue shift 
D) 1944.4; blueshift 
E) 1944.4; redshift

Question 5

The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that

Accepted Answer

A) they are formed by material falling into the galaxy. 
B) they are powered by magnetic fields. 
C) they are excited by radiation from nearby galaxies. 
D) they are powered by the rapid rotation of the galaxy. 
E) they are created by jets from the galaxy emitting where the material is halted. 
A) they are formed by material falling into the galaxy. 
B) they are powered by magnetic fields. 
C) they are excited by radiation from nearby galaxies. 
D) they are powered by the rapid rotation of the galaxy. 
E) they are created by jets from the galaxy emitting where the material is halted.

Question 6

Astronomers who discovered quasars found that they show ___________ of their spectral lines and are thus probably much ___________ than nearby galaxies.

Accepted Answer

A) large redshifts; farther away 
B) large blueshifts; farther away 
C) no wavelength difference; nearer 
D) large redshifts; nearer 
E) large blueshift; nearer 
A) large redshifts; farther away 
B) large blueshifts; farther away 
C) no wavelength difference; nearer 
D) large redshifts; nearer 
E) large blueshift; nearer

Question 7

Seyfert galaxies

Accepted Answer

A) are more common in close pairs of galaxies than in isolated systems. 
B) emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. 
C) generally show redshifts greater than 6. 
D) are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. 
E) are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6. 
A) are more common in close pairs of galaxies than in isolated systems. 
B) emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. 
C) generally show redshifts greater than 6. 
D) are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. 
E) are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6.

Question 8

Why should we expect quasars to be small How small should we expect them to be

Accepted Answer

Quasars fluctuate rapidly whic

Question 9

The Virgo cluster

Accepted Answer

A) is the galactic cluster that contains the Milky Way. 
B) is the oldest known cluster of galaxies. 
C) is located at the center of the universe. 
D) contains mostly spiral galaxies and very few elliptical galaxies. 
E) is a rich cluster and the closest cluster of galaxies outside of the Local Group. 
A) is the galactic cluster that contains the Milky Way. 
B) is the oldest known cluster of galaxies. 
C) is located at the center of the universe. 
D) contains mostly spiral galaxies and very few elliptical galaxies. 
E) is a rich cluster and the closest cluster of galaxies outside of the Local Group.

Question 10

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields

Accepted Answer

High-energy jets appear to be the result

Question 11

Due to the extremely rapid orbital velocities of material near the center of many galaxies, these galaxies are believed to contain _______________ at their centers.

Accepted Answer

a supermas

In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

The above visual wavelength image suggests that star formation is currently occurring.

The hydrogen Balmer line Hβ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the change in wavelength (in nm) of this quasar Is it a "redshift" or "blueshift"

The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that

Astronomers who discovered quasars found that they show _ of their spectral lines and are thus probably much _ than nearby galaxies.

Seyfert galaxies

Why should we expect quasars to be small How small should we expect them to be

The Virgo cluster

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields

Due to the extremely rapid orbital velocities of material near the center of many galaxies, these galaxies are believed to contain _______________ at their centers.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 13: Galaxies: Normal and Active

In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

The above visual wavelength image suggests that star formation is currently occurring.

The hydrogen Balmer line Hβ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the change in wavelength (in nm) of this quasar Is it a "redshift" or "blueshift"

The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that

Astronomers who discovered quasars found that they show ___________ of their spectral lines and are thus probably much ___________ than nearby galaxies.

Seyfert galaxies

Why should we expect quasars to be small How small should we expect them to be

The Virgo cluster

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields

Due to the extremely rapid orbital velocities of material near the center of many galaxies, these galaxies are believed to contain _______________ at their centers.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Astronomers who discovered quasars found that they show _ of their spectral lines and are thus probably much _ than nearby galaxies.