Question 1

The multiple images forming a ring around the cluster come from two merging distant galaxies.

Accepted Answer

A) True 
 B)False

Question 2

If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?

Accepted Answer

A)  8.75 × 103 Mpc 
B)  2.4 × 109 Mpc 
C)  5.6 × 105 Mpc 
D)  114 Mpc 
E)  8.75 × 10-3 Mpc 
A)  8.75 × 103 Mpc 
B)  2.4 × 109 Mpc 
C)  5.6 × 105 Mpc 
D)  114 Mpc 
E)  8.75 × 10-3 Mpc

Question 3

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 4

The radio lobes that are on each side of some radio galaxies and jets from them produce mainly

Accepted Answer

A)  21-cm radiation. 
B)  synchrotron radiation. 
C)  black body radiation. 
D)  emission lies due to hydrogen. 
E)  absorption lines due to hydrogen. 
A)  21-cm radiation. 
B)  synchrotron radiation. 
C)  black body radiation. 
D)  emission lies due to hydrogen. 
E)  absorption lines due to hydrogen.

Question 5

Elliptical galaxies contain more gas, dust, and young stars than do Sa galaxies.

Accepted Answer

A) True 
 B)False

Question 6

The dark lines we see in the above visual wavelength image of a spiral galaxy viewed edge-on is from dust.

Accepted Answer

A) True 
 B)False

Question 7

Quasar redshifts are usually larger than the redshifts of the visible galaxies.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

The blue sharp point of light with diffraction spikes in the upper right corner of the visual + NIR image of the Hubble Deep Field, shown above, is a star in our Milky Way Galaxy.

Accepted Answer

A) True 
 B)False

Question 10

Poor clusters

Accepted Answer

A)  contain more than 1000 stars and are found in the halo of the galaxy. 
B)  contain lots of young stars and are found in the disk of a spiral galaxy. 
C)  contain more than 1000 galaxies and are generally elliptical in shape. 
D)  contain fewer than 1000 galaxies and tend to be irregularly shaped. 
E)  are found in the nucleus of the galaxy. 
A)  contain more than 1000 stars and are found in the halo of the galaxy. 
B)  contain lots of young stars and are found in the disk of a spiral galaxy. 
C)  contain more than 1000 galaxies and are generally elliptical in shape. 
D)  contain fewer than 1000 galaxies and tend to be irregularly shaped. 
E)  are found in the nucleus of the galaxy.

Question 11

________________ emit radio energy from areas on either side of the galaxy that are inflated by jets.

Accepted Answer

Double-lob

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

That the radio lobes radiate synchrotron radiation indicates that

Accepted Answer

A)  high-speed electrons are spiraling through a magnetic field. 
B)  the source of the radio jets must be a black hole. 
C)  the source of the radio energy is rotating rapidly. 
D)  the central galaxy must be a giant elliptical galaxy. 
E)  the central galaxy must rotate about two nearly perpendicular axes. 
A)  high-speed electrons are spiraling through a magnetic field. 
B)  the source of the radio jets must be a black hole. 
C)  the source of the radio energy is rotating rapidly. 
D)  the central galaxy must be a giant elliptical galaxy. 
E)  the central galaxy must rotate about two nearly perpendicular axes.

Question 14

What of the following distance methods is used to determine the distance to the most distant galaxies?

Accepted Answer

A)  radar echo 
B)  supernova observations 
C)  period-luminosity relationship of variable stars 
D)  parallax 
A)  radar echo 
B)  supernova observations 
C)  period-luminosity relationship of variable stars 
D)  parallax

Question 15

Merging of galaxies is known as ____________.

Accepted Answer

cannibalis

Question 16

What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured?

Accepted Answer

A)  Hubble's law 
B)  supernova observations 
C)  period-luminosity relationship of variable stars 
D)  parallax 
A)  Hubble's law 
B)  supernova observations 
C)  period-luminosity relationship of variable stars 
D)  parallax

Question 17

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

Accepted Answer

A)  Doppler shifts of material at the edge of its disk and computing P = 2 π r / v . 
B)  the distances of the Doppler shift points from its center. 
C)  Doppler shifts of material at the edge of its disk and computing P = 2 π r / v and the distances of the Doppler shift points from its center. 
D)  It is impossible to estimate the mass of M31. 
A)  Doppler shifts of material at the edge of its disk and computing P = 2 π r / v . 
B)  the distances of the Doppler shift points from its center. 
C)  Doppler shifts of material at the edge of its disk and computing P = 2 π r / v and the distances of the Doppler shift points from its center. 
D)  It is impossible to estimate the mass of M31.

Question 18

Why can't galaxy evolution go from elliptical to spiral to irregular?

Accepted Answer

​ 
A n elliptical galaxy cannot become a

Question 19

Discuss the observational differences between spiral, elliptical, and irregular galaxies.

Accepted Answer

Elliptical galaxies (class E) have no di

Question 20

The above visual wavelength image is of an interacting spiral galaxy.

Accepted Answer

A) True 
 B)False

The multiple images forming a ring around the cluster come from two merging distant galaxies.

If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?

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

The radio lobes that are on each side of some radio galaxies and jets from them produce mainly

Elliptical galaxies contain more gas, dust, and young stars than do Sa galaxies.

The dark lines we see in the above visual wavelength image of a spiral galaxy viewed edge-on is from dust.

Quasar redshifts are usually larger than the redshifts of the visible galaxies.

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

Poor clusters

________________ emit radio energy from areas on either side of the galaxy that are inflated by jets.

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

That the radio lobes radiate synchrotron radiation indicates that

What of the following distance methods is used to determine the distance to the most distant galaxies?

Merging of galaxies is known as ____________.

What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured?

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

Why can't galaxy evolution go from elliptical to spiral to irregular?

Discuss the observational differences between spiral, elliptical, and irregular galaxies.

The above visual wavelength image is of an interacting spiral galaxy.

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

Origin of the Solar System and Extrasolar Planets

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

The multiple images forming a ring around the cluster come from two merging distant galaxies.

If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?

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

The radio lobes that are on each side of some radio galaxies and jets from them produce mainly

Elliptical galaxies contain more gas, dust, and young stars than do Sa galaxies.

The dark lines we see in the above visual wavelength image of a spiral galaxy viewed edge-on is from dust.

Quasar redshifts are usually larger than the redshifts of the visible galaxies.

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

The blue sharp point of light with diffraction spikes in the upper right corner of the visual + NIR image of the Hubble Deep Field, shown above, is a star in our Milky Way Galaxy.

Poor clusters

________________ emit radio energy from areas on either side of the galaxy that are inflated by jets.

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

That the radio lobes radiate synchrotron radiation indicates that

What of the following distance methods is used to determine the distance to the most distant galaxies?

Merging of galaxies is known as ____________.

What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured?

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

Why can't galaxy evolution go from elliptical to spiral to irregular?

Discuss the observational differences between spiral, elliptical, and irregular galaxies.

The above visual wavelength image is of an interacting spiral galaxy.

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

Origin of the Solar System and Extrasolar Planets

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