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Sloan Digital Sky Survey image is of blazar Markarian 421, illustrating the bright nucleus and elliptical host galaxy. Credit: Sloan Digital Sky Survey.

High-velocity galaxy radiation astronomy is a lecture as part of the radiation astronomy course on the principles of radiation astronomy.

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QuizEdit







  

1

A cosmic ray may originate from what astronomical source?

Jupiter
the solar wind
the diffuse X-ray background
Mount Redoubt in Alaska
the asteroid belt
an active galactic nucleus

2

Complete the text:

Match up the item letter with each of the first astronomical source possibilities below:
Meteors - A
Cosmic rays - B
Neutrons - C
Protons - D
Electrons - E
Positrons - F
Gamma rays - G
Superluminals - H
cosmic rays

galactic nuclei

.
comets

.
electron-positron annihilation

.
weak force nuclear decay

.
AGNs

.
511 keV photon pair production

.
solar wind

.

3

What may be the first astronomical cosmic-ray source?

Jupiter
the solar wind
the diffuse X-ray background
Mount Redoubt in Alaska
the asteroid belt
an active galactic nucleus

4

Which of the following is associated with the diffuse X-ray background?

the Sun
rather consistently observed over a wide range of energies
an Aitoff-Hammer equal-area map in galactic coordinates
an isotropic X-ray background flux was obtained in 1956
an early high-energy end was obtained by instruments on board Ranger 3
super soft X-rays are absorbed by galactic neutral hydrogen

5

Which of the following is associated with the Sun as a possible first X-ray source?

lofting an X-ray detector with a V-2 rocket from White Sands Proving Grounds on August 5, 1948
in the late 1930s, "the presence of a very hot, tenuous gas surrounding the Sun ... was inferred indirectly from optical coronal lines of highly ionized species"
early theoretical estimates of black body radiation from the solar corona
“extensive 1/4 keV emission in the Galactic halo”
its overall redness has decreased
ionizing radiation that may originate deep within the Sun does not reach the bottom of a sunspot

6

Complete the text:

A well-known black hole (or black hole candidate) and galactic X-ray source in the constellation Cygnus is

.

7

Ionization within the Earth's atmosphere from cosmic rays has what property?

it's subject to solar eclipses
it increases underwater
cosmic rays do not penetrate the atmosphere
is higher at the base of the Eiffel tower rather than the top
is obscured by hot-air balloons
the ionization rate rises at rising elevation

8

Yes or No, An intergalactic medium is a medium in between interplanetary and interstellar media.

Yes
No

9

Complete the text:

Match up the item letter with each of the possibilities below:
Intracluster medium - A
Mayall's object - B
M82 PAHs - C
Milky Way bubbles - D
Local Hot Bubble - E
Stephan's Quintet - F
UGC 8335 - G
Arp 272 - H

.

.

.

.

.

.

.

10

True or False, An intergalactic medium is a rarefied plasma rather than a gaseous medium.

TRUE
FALSE

11

Complete the text:

Match up the item letter with each of the possibilities below:
synchrotron X-rays - A
power law - B
inverse Compton - C
thermal Bremsstrahlung - D
black body - E
cyclotron - F
Supergiant Fast X-ray Transients

Galactic diffuse emission

.
Crab nebula

.
continuum

.
accretion disk

.
strongly magnetized neutron stars

.

12

Complete the text:

Match up the item letter with each of the cosmogonic possibilities below:
interior models of the giant planets - A
high interest for cosmogony, geophysics and nuclear physics - B
hierarchical accumulation - C
clouds and globular clusters - D
cosmic helium abundance - E
deuterium fusion - F
a large deficiency of light elements - G
after galactic sized systems had collapsed - H
the motions of hydrogen

formation of luminous quasars

.
stars with an initial mass less than the solar mass

.
rotating liquid drops

.
primordial is less than 26 per cent

.
a solar mixture of elements dominated by hydrogen and helium gas

.
around 13 Jupiter masses

.
smaller rocky objects

.

13

Complete the text:

Discussion of the alternative hypothesis of cloud ejection from the equatorial layer of the Galaxy leads to the conclusion that the

halo must be highly

and that the coronal clouds are probably

regions.

14

True or False, 3C 295 is a galaxy cluster filled with a vast cloud of 50 MK gas and plasma.

TRUE
FALSE

15

Yes or No, Active galactic nuclei do not occur in spiral galaxies generally.

Yes
No

16

Complete the text:

Match up the standard candle with a representative image:
Tully-Fisher relation - A
surface brightness fluctuations - B
absolute magnitude - C
globular clusters - D
active galactic nuclei - E
Type Ia supernova - F
classical Cepheid variable - G
novae - H
planetary nebula - I

.

.

.

.

.

.

.

17

Complete the text:

Match up the radiation object with the likely source:
- L
- M
- N
- O
- P
- Q
- R
- S
- T
a Craters of the Moon volcano

.
violet image of Venus

.
active galactic nuclear region of NGC 5728

.
cosmic-ray bombardment of the Moon's surface

.
blue lights from Io

.
neutrino profile of the solar octant

.
planetary nebula NGC 7048

.
ultraviolet image of the Earth

.
a neutron star in a binary system

.

18

Complete the text:

Match up the item letter with each of the first astronomical source possibilities below:
Meteors - A
Cosmic rays - B
Neutrons - C
Protons - D
Electrons - E
Positrons - F
Gamma rays - G
Superluminals - H
cosmic rays

galactic nuclei

.
comets

.
electron-positron annihilation

.
weak force nuclear decay

.
AGNs

.
511 keV photon pair production

.
solar wind

.

19

Which of the following are associated with red clump stars as a standard candle?

many examples within reach of parallax measurements
internal extinction
star forming regions
sufficiently bright
local group galaxies
almost as luminous as the brightest red supergiants

20

Complete the text:

Match up the item letter with each of the possibilities below:
Einstein ring - A
stellar nebula - B
Andromeda galaxy - C
Triplet galaxies interacting - D
Hubble galaxies - E
Dark matter halo simulation - F
Fairall 9 (Seyfert galaxy in X-rays) - G
Tycho Brahe observatory, remotely controlled telescope, captured galaxy - H

.

.

.

.

.

.

.

.

21

Phenomena associated with the Milky Way are?

spiral arms
a spheroidal shape
a standard to differentiate dwarf galaxies
often referred to as the Galaxy
arms of younger stars
contains star clusters
dust lanes
extended red emission (ERE)
a faint galaxy heavy with dark matter may orbit it
larger than the Andromeda galaxy


HypothesesEdit

  1. High-velocity galaxies leave a trail that can be detected.

See alsoEdit

External linksEdit