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Exploring The Cosmos 1Y > Galaxies and Large Scale Structure > Flashcards

Galaxies and Large Scale Structure Flashcards

1
Q

Which of the following statements about Seyfert galaxies is correct?

A. Their spectra show narrow emission lines from highly ionised atoms
B. Their spectra show broad emission lines from highly ionised atoms
C. Their spectra show narrow absorption lines from highly ionised atoms
D. Their spectra show broad absorption lines from highly ionised atoms

A

B. Their spectra show broad emission lines from highly ionised atoms

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2
Q

Which of the following is NOT a characteristic of Quasars?

A. Irregular brightness variations
B. Brightness chances of fast timescales
C. Double jets visible from Earth
D. Associated with distorted or irregular galaxies.

A

C. Double jets visible from Earth

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3
Q

Quasar characteristics

A

Irregular brightness variations

Brightness chances of fast timescales

Associated with distorted or irregular galaxies.

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4
Q

Which of the following is not a standard candle that can be used for measurement of distances?

A. Supernova Type 1a
B. Supernova Type 2
C. Type 1 Cepheids
D. Type 2 Cepheids

A

B. Supernova Type 2

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5
Q

The Tully-Fisher relation relation links…

A

the rotational speed of a galaxy with its total luminosity

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6
Q

Which of the following is not a type of gas cloud?

A. Dark matter clouds
B. Intercloud medium
C. Dark giant molecular clouds
D. Very hot coronal gas

A

A. Dark matter clouds

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7
Q

Which of the following phenomena does NOT contribute to the creation of chemical elements?

A. Merger of two neutron stars
B. Merger of two black holes
C. Supernova Type 1a
D. Supernova Type 2

A

B. Merger of two black holes

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8
Q

Population 1 stars are

A

young and metal rich

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9
Q

Evidence for presence of dark matter in galaxies is derived from

A

rotational curves of galaxies

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10
Q

Globular clusters are

A

found in the spherical component and are tightly bound by gravity

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11
Q

Which of the following statements is true?

A. Average distance between stars in a galaxy depends on their spectral type
B. Average distance between stars in a galaxy is about 20 times their diameter
C. Average distance between galaxies is 10,000,000 times their diameter
D. Average distance between stars in a galaxy is about 10,000,000 times their diameter

A

D. Average distance between stars in a galaxy is about 10,000,000 times their diameter

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12
Q

Which of the following statements is NOT true for a rich cluster?

A. Collisions and interactions between galaxies are common.
B. They tend to contain at their center several giant elliptical galaxies.
C. They tend to contain at their center several giant and very bright spiral galaxies.
D. They feature a high fraction of elliptical and S0 galaxies

A

C. They tend to contain at their center several giant and very bright spiral galaxies.

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13
Q

Galaxies with a shell-like structure originate from

A

The merger of two galaxies

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14
Q

Which of the following techniques is NOT part of the distance ladder?

A. Spectroscopic parallax
B. Hubble’s law
C. Cepheid Variables
D. Hubble’s tuning fork

A

D. Hubble’s tuning fork

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15
Q

The Tully-Fisher relation describes the correlations of which of the following characteristics of a galaxy?

A. Total luminosity and apparent brightness
B. Apparent brightness and age of the galaxy
C. Age of the galaxy and rotational speed
D. Rotational speed and total luminosity

A

D. Rotational speed and total luminosity

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16
Q

Which of the following is NOT a characteristic of Population II stars

A. old
B. metal poor
C. are mainly formed in the spiral arms
D. highly elliptical orbits

A

C. are mainly formed in the spiral arms

17
Q

What is a usual percentage of metals in a Population I star?

A

20%

18
Q

Which of the following is not a galaxy type

A. ellipticals
B. spirals
C. barred ellipticals
D. irregular

A

C. barred ellipticals

19
Q

At the centre of the Milky Way there is

A. A quasar
B. A supermassive black hole
C. Dark energy
D. A region of intense star formation

A

B. A supermassive black hole

20
Q

Which of the following statements about the Milky Way is NOT correct?

A. It features an upper and a lower disk
B. It features an outer and an inner disk
C. The spiral arms are in the disk
D. The open clusters are in the disk

A

A. It features an upper and a lower disk

21
Q

One parsec is equivalent to

A. One astronomical unit
B. 3.3 light years
C. 300,000 km
D. The size of the Milky Way

A

B. 3.3 light years

22
Q

Which of the following is NOT a characteristic of globular clusters?

A. Because of the relative proximity of the stars, they are tightly bound by gravity.
B. They contain 10,000 to 100,000 stars.
C. They are found in the spherical component.
D. They contain much gas and dust.

A

D. They contain much gas and dust.

23
Q

type of nebulae

A

Reflection nebulae
Emission nebulae
Dark nebulae
Planetary Nebulae
Supernova Remnants

24
Q

Which of the following statements about the Milky Way is correct?

A. The stars in the disc move in almost circular orbits.
B. The stars in the halo move in almost circular orbits
C. Globular clusters move in almost circular orbits
D. Open clusters move in highly elliptical orbits

A

A. The stars in the disc move in almost circular orbits.

25
Q

Population I stars are formed in

A

the spiral arms

26
Q

What is a usual percentage of metals in a Population II star?

A

0.2%

27
Q

type of gas cloud

A

Diffuse gas clouds
Dark giant molecular clouds
Very hot coronal gas

28
Q

60% of the catalogued galaxies are

A

spirals

29
Q

The most common type of galaxies are

A. ellipticals
B. spirals
C. starburst
D. irregular

A

ellipticals

30
Q

Which of the following is NOT part of the cosmic distance ladder?

A. Parallax method
B. Cepheid Varaiables
C. Supernovae Type 1a
D. Dark matter

A

D. Dark matter

Exploring The Cosmos 1Y (5 decks)

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