Radiation astronomy/Active galactic nuclei/Quiz

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X-Rays Emanate From Heated Material Falling Into Black Hole. Credit: NASA, ESA, A. M. Koekemoer (STScI), M. Dickinson (NOAO) and The GOODS Team.{{free media}}

Active galactic nuclei astronomy is the latest lecture for the course on the principles of radiation astronomy.

It is the flagship lecture for the radiation astronomy department of the school of physics and astronomy.

You are free to take this quiz at any time.

Once you’ve read and studied the lecture itself, the links contained within the lecture and listed under See also and External links, you should have adequate background to to get 100 %. Additional information that may be helpful is in the {{Radiation astronomy resources}} template.

Suggestion: Have the lecture available in a separate window.

Enjoy learning by doing!

Quiz[edit | edit source]


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


2 A cosmic ray may originate from what astronomical source?

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

3 True or False, Any small luminous green dot appearing in the cloudless portion of the night sky, especially with a fixed location relative to other such dots is most likely to be an active galactic nucleus.


4 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

Maximum magnitude-rate of decline for novae.gif

B-, R-, I-, and H-band Tully-Fisher relations.gif

Blackbody spectral density.gif

SN2005ke labels.jpg

A further away schematic galaxy.gif


Planetary nebulae H-R.gif

Luminosity function for globular clusters.gif


5 Complete the text:

Match up the radiation object with the likely source:
Crmo volcanic bomb 20070516123632.jpg
- L
Circinus X-1.jpg
- M
Moon egret.jpg
- N
Neusun1 superk1.jpg
- O
Earth in ultraviolet from the Moon (S72-40821).jpg
- P
- Q
Io Color Eclipse Movie - PIA03450.gif
- R
NGC 7048.jpg
- S
HST NGC 5728 -O III- emission-line image.jpg
- 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


6 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


electron-positron annihilation

weak force nuclear decay


511 keV photon pair production

solar wind


7 AGNs may be used as standard candles because?

they are extremely luminous
can be observed at very large distances
they emit their own light signature
GeV gamma rays
reverberation mapping
tight relationship between the luminosity of an AGN and the radius of its broad line region

8 Which of the following are associated with standard candles?

Cepheid variables
Type Ia supernovae
the Sun
stellar spectral type
absolute magnitude
Tully-Fisher relation

9 Which of the following are associated with the envelope of the polarization current density?

emission of electromagnetic radiation from a superluminal charged particle
intensity of some components decays as the inverse of the distance from the source
non-spherically-decaying sources
emission contains very high frequencies not present in the synthesis of the source
non-spherically decaying components of the radiation do not violate energy conservation
strong electromagnetic fields are compensated by weak fields elsewhere

10 What may be the first astronomical cosmic-ray source?

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

Hypotheses[edit | edit source]

  1. Questions about pure astronomy may be most about early astronomy.

See also[edit | edit source]

External links[edit | edit source]

{{History of science resources}}

{{Radiation astronomy resources}}