Question 1

If a quasar has a red shift of 0.98, then it is receding from Earth at 98 percent the speed of light.

Accepted Answer

A) True 
 B)False

Question 2

The Large and Small Magellanic clouds are satellites galaxies of the Milky Way.

Accepted Answer

A) True 
 B)False

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

Accepted Answer

The answer of Describe the kind of observations that have...

Question 5

Cepheid variable stars are more luminous than the sun.

Accepted Answer

A) True 
 B)False

Question 6

Centaurus A is a radio galaxy that has a visible galaxy at the center. This central elliptical galaxy of Centaurus A is encircled by a ring of gas and dust, different from most elliptical galaxies. The dust ring orbits about an axis that is perpendicular to the axis of rotation of the elliptical galaxy. What does this suggest about this central elliptical galaxy of Centaurus A?

Accepted Answer

A)   The radio jets have caused the dust disk to be driven around the elliptical galaxy.
B)   There are at least two black holes at the center of the elliptical galaxy.
C)   Centaurus A is probably the result of a merger of an elliptical galaxy and a spiral galaxy.
D)   Dust is produced as the jets interact with the intergalactic medium.
E)   Elliptical galaxies often contain dust that forms a disk along their rotation axis.

Question 7

__________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus.

Accepted Answer

A)   Irregular
B)   S0
C)   E7
D)   Sa
E)   E0

Question 8

Mathematical models indicate that ____ galaxies are produced by high speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy.

Accepted Answer

A)   ring
B)   spiral
C)   antenna
D)   irregular
E)   tidal tail

Question 9

In the double-exhaust model, the radio lobes of a radio galaxy are inflated by

Accepted Answer

A)   jets of excited gas flowing from the central galaxy.
B)   jets of high energy sound waves flowing from the central galaxy.
C)   a disk of ionized material that orbits very near a supermassive black hole.
D)   dark clouds of very cold gas and dust.
E)   none of the above

Question 10

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 super massive black hole surrounded with 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 11

All ____ galaxies are spiral galaxies that have small luminous nuclei.

Accepted Answer

A)   active
B)   radio
C)   Seyfert
D)   double-lobed radio
E)   blazar

Question 12

The central galaxy in a double-lobed radio source is usually

Accepted Answer

A)   an irregular galaxy.
B)   a spiral galaxy.
C)   a dwarf elliptical galaxy.
D)   a giant elliptical galaxy.
E)   a quasar.

Question 13

How are astronomers able to determine that quasars are so small?

Accepted Answer

A)   They are variable over a short period of time.
B)   They emit mainly X-rays.
C)   They are only found at very large distance.
D)   The structure of a quasar is completely resolved in images.

Question 14

Some large clusters of galaxies do not appear to contain enough mass to hold themselves together.

Accepted Answer

A) True 
 B)False

Question 15

If a quasar has a recessional velocity of 2.7 10 5 km/sec and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/sec) /Mpc to see what arithmetic process you need to do on a calculator.

Accepted Answer

A)   50 km/sec/Mpc
B)   9.7 10 8 (km/sec) Mpc
C)   75 km/sec/Mpc
D)   0.013 km/sec/Mpc
E)   273,600 km/sec/Mpc

Question 16

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.

Question 17

The Milky Way is part of
I. a poor cluster.
II. a rich cluster.
III. the Virgo Cluster.
IV. the Local Group.

Accepted Answer

A)   I and III
B)   I and IV
C)   II and III
D)   II and IV
E)   just III

Question 18

Quasars are most common with red shifts

Accepted Answer

A)   less than 0.1
B)   less than 0.5
C)   of about 2
D)   greater than 6
E)   greater than 8

Question 19

Statistical evidence

Accepted Answer

A)   can be used to draw conclusions about a specific cases.
B)   is applicable to classes of objects where only a few objects from the class have been studied.
C)   allows scientists to determine the mechanism that produces the dust ring in Centaurus A.
D)   allows scientists to deduce general characteristics about a class of objects with similar properties.
E)   provides insight into the behavior of an individual object based on careful observations of it.

Question 20

__________ is (are)  observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar.

Accepted Answer

A)   A double-lobed radio galaxy
B)   Superluminal expansion
C)   The gravitational lens effect
D)   A blazar
E)   Gravitational waves

Exam 13: Galaxies: Normal and Active

The Milky Way is part of I. a poor cluster. II. a rich cluster. III. the Virgo Cluster. IV. the Local Group.

Correct Answer
verified

__________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus.

Correct Answer
verified

Statistical evidence

Correct Answer
verified

If a quasar has a red shift of 0.98, then it is receding from Earth at 98 percent the speed of light.

Correct Answer
verified

The Virgo cluster

Correct Answer
verified

Cepheid variable stars are more luminous than the sun.

Correct Answer
verified

Quasars are most common with red shifts

Correct Answer
verified

Correct Answer
verified

The Large and Small Magellanic clouds are satellites galaxies of the Milky Way.

Correct Answer
verified

The central galaxy in a double-lobed radio source is usually

Correct Answer
verified

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

Correct Answer
verified

Some large clusters of galaxies do not appear to contain enough mass to hold themselves together.

Correct Answer
verified

__________ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar.

Correct Answer
verified

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

Correct Answer
verified

If a quasar has a recessional velocity of 2.7 10 5 km/sec and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/sec) /Mpc to see what arithmetic process you need to do on a calculator.

Correct Answer
verified

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

Correct Answer
verified

All ____ galaxies are spiral galaxies that have small luminous nuclei.

Correct Answer
verified

In the double-exhaust model, the radio lobes of a radio galaxy are inflated by

Correct Answer
verified

How are astronomers able to determine that quasars are so small?

Correct Answer
verified

Mathematical models indicate that ____ galaxies are produced by high speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy.

Correct Answer
verified

Exam 13: Galaxies: Normal and Active

The Milky Way is part of I. a poor cluster. II. a rich cluster. III. the Virgo Cluster. IV. the Local Group.

Correct AnswerverifiedShow Answer

__________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus.

Correct AnswerverifiedShow Answer

Statistical evidence

Correct AnswerverifiedShow Answer

If a quasar has a red shift of 0.98, then it is receding from Earth at 98 percent the speed of light.

Correct AnswerverifiedShow Answer

The Virgo cluster

Correct AnswerverifiedShow Answer

Cepheid variable stars are more luminous than the sun.

Correct AnswerverifiedShow Answer

Quasars are most common with red shifts

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The Large and Small Magellanic clouds are satellites galaxies of the Milky Way.

Correct AnswerverifiedShow Answer

The central galaxy in a double-lobed radio source is usually

Correct AnswerverifiedShow Answer

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

Correct AnswerverifiedShow Answer

Some large clusters of galaxies do not appear to contain enough mass to hold themselves together.

Correct AnswerverifiedShow Answer

__________ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If a quasar has a recessional velocity of 2.7 10 5 km/sec and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/sec) /Mpc to see what arithmetic process you need to do on a calculator.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All ____ galaxies are spiral galaxies that have small luminous nuclei.

Correct AnswerverifiedShow Answer

In the double-exhaust model, the radio lobes of a radio galaxy are inflated by

Correct AnswerverifiedShow Answer

How are astronomers able to determine that quasars are so small?

Correct AnswerverifiedShow Answer

Mathematical models indicate that ____ galaxies are produced by high speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy.

Correct AnswerverifiedShow Answer

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