Question 1

The elliptical galaxies are most like what part of our Milky Way? Explain.

Accepted Answer

They are "all halo",with only ...

Question 2

What is true of the lobes of a radio galaxy?

Accepted Answer

A)   They are perpendicular to the galactic plane.
B)   They are hotter than the galactic core.
C)   They radiate primarily in the X-ray.
D)   They extend out along the galactic plane.
E)   They form close to the edge of the galaxy.F) B) and E)
G) A) and B)

Question 3

How can the size of a quasar be measured?

Accepted Answer

The size of a quasar...

Question 4

The energy radiated by a typical quasar requires that its black hole accrete about:

Accepted Answer

A)   one solar mass a century.
B)   one solar mass a decade.
C)   one solar mass a year.
D)   ten solar masses a year.
E)   one solar mass a day.F) A) and B)
G) C) and D)

Question 5

Irregular galaxies,although small,have large H II regions and much on-going star formation for their size.

Accepted Answer

A) True 
 B)False

Question 6

Which of these would be made up of only Population II stars?

Accepted Answer

A)   elliptical galaxies
B)   Irr type I
C)   Irr type II
D)   barred spirals
E)   Seyfert spiralsF) A) and B)
G) D) and E)

Question 7

Although theory says a massive black hole with an accretion disk should be emitting X-rays,many black holes emit:

Accepted Answer

A)   mostly in the infrared.
B)   only in the visible.
C)   mainly in the gamma.
D)   virtually no radiation at all.
E)   equally across the entire electromagnetic spectrum.F) C) and D)
G) A) and E)

Question 8

The magnetic fields carried by jets coming from active galactic nuclei are generated by:

Accepted Answer

A)   the combined magnetic fields of the many stars near the galaxy's center.
B)   the central black hole.
C)   the movement of the interstellar matter of the galaxy.
D)   the movement of the stars in the galaxy.
E)   charged matter in the accretion disk of the central black hole.F) D) and E)
G) B) and C)

Question 9

The flattest of the ellipticals are class:

Accepted Answer

A)   E0.
B)   SBO.
C)   E7.
D)   E9.
E)   SBF.F) A) and B)
G) A) and C)

Question 10

A spherical galaxy,like M87,which looks like a monster globular cluster,is type:

Accepted Answer

A)   S0.
B)   ES.
C)   E0.
D)   ES1.
E)   0V.F) A) and E)
G) A) and B)

Question 11

The look-back time of an object is directly related to its:

Accepted Answer

A)   mass.
B)   distance.
C)   luminosity.
D)   size.
E)   composition.F) C) and E)
G) B) and D)

Question 12

When mass is accreted into a black hole,how much total mass-energy can be radiated away?

Accepted Answer

A)   0.007%
B)   0.08%
C)   1.4%
D)   20%
E)   50%F) A) and B)
G) A) and C)

Question 13

What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?

Accepted Answer

All active galaxies and quasars emit mas...

Question 14

The type of radiation coming from active nuclei due to electrons spiraling in very strong magnetic fields at relativistic speeds is:

Accepted Answer

A)   positron radiation.
B)   thermal energy.
C)   a blackbody curve.
D)   synchrotron radiation.
E)   nuclear energy.F) C) and D)
G) B) and C)

Question 15

The quasars with the largest presently known redshifts are close to:

Accepted Answer

A)   0.96.
B)   3.
C)   8.
D)   20.
E)   65.F) A) and D)
G) B) and E)

Question 16

Astronomers observe unobscured X-rays generated in active galactic nuclei.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following is NOT one of Hubble's types of galaxies?

Accepted Answer

A)   normal spirals
B)   barrel spirals
C)   Seyfert spirals
D)   irregular type II
E)   dwarf ellipticalsF) B) and C)
G) A) and E)

Question 18

In this diagram,the galaxy at the left side is a(n) :

Accepted Answer

A)   Seyfert.
B)   Spiral.
C)   Barred spiral.
D)   Elliptical.
E)   Irregular.F) A) and B)
G) C) and E)

Question 19

According to the Hubble Law,a galaxy with a velocity of 25,000 km/s will be:

Accepted Answer

A)   100 million pcs away.
B)   400 million pcs away.
C)   700 million pcs away.
D)   1000 million pcs away.
E)   less than 1 million pcs away.F) A) and E)
G) A) and C)

Question 20

Almost all active galactic nuclei seem to be involved in ________ with neighbors.

Accepted Answer

The answer of Almost all active galactic nuclei seem to...

Exam 24: Galaxies: Building Blocks of the Universe

What is true of the lobes of a radio galaxy?

Correct AnswerverifiedShow Answer

What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?

Correct AnswerverifiedAll active galaxies and quasars emit mas...View AnswerShow Answer

The energy radiated by a typical quasar requires that its black hole accrete about:

Correct AnswerverifiedShow Answer

A spherical galaxy,like M87,which looks like a monster globular cluster,is type:

Correct AnswerverifiedShow Answer

The look-back time of an object is directly related to its:

Correct AnswerverifiedShow Answer

Irregular galaxies,although small,have large H II regions and much on-going star formation for their size.

Correct AnswerverifiedShow Answer

According to the Hubble Law,a galaxy with a velocity of 25,000 km/s will be:

Correct AnswerverifiedShow Answer

In this diagram,the galaxy at the left side is a(n) :

Correct AnswerverifiedShow Answer

When mass is accreted into a black hole,how much total mass-energy can be radiated away?

Correct AnswerverifiedShow Answer

Which of the following is NOT one of Hubble's types of galaxies?

Correct AnswerverifiedShow Answer

How can the size of a quasar be measured?

Correct AnswerverifiedThe size of a quasar...View AnswerShow Answer

Which of these would be made up of only Population II stars?

Correct AnswerverifiedShow Answer

The magnetic fields carried by jets coming from active galactic nuclei are generated by:

Correct AnswerverifiedShow Answer

Almost all active galactic nuclei seem to be involved in ________ with neighbors.

Correct AnswerverifiedShow Answer

Although theory says a massive black hole with an accretion disk should be emitting X-rays,many black holes emit:

Correct AnswerverifiedShow Answer

The elliptical galaxies are most like what part of our Milky Way? Explain.

Correct AnswerverifiedThey are "all halo",with only ...View AnswerShow Answer

Astronomers observe unobscured X-rays generated in active galactic nuclei.

Correct AnswerverifiedShow Answer

The type of radiation coming from active nuclei due to electrons spiraling in very strong magnetic fields at relativistic speeds is:

Correct AnswerverifiedShow Answer

The quasars with the largest presently known redshifts are close to:

Correct AnswerverifiedShow Answer

The flattest of the ellipticals are class:

Correct AnswerverifiedShow Answer

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All active galaxies and quasars emit mas...
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The size of a quasar...
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They are "all halo",with only ...
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Correct Answer
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