Radiation astronomy/Active galactic nuclei/Quiz

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 of the course on the principles of radiation astronomy.

It is the flagship lecture for the 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 {{Principles of radiation astronomy}} template.

Suggestion: Have the lecture available in a separate window.

Enjoy learning by doing!

Quiz

Point added for a correct answer:
Points for an incorrect answer:
Ignore the questions' coefficients:

1

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

	Yes
	No

2

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

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.

	TRUE
	FALSE

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

.

.

.

.

.

.

.

5

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 .

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 .

comets .

electron-positron annihilation .

weak force nuclear decay .

AGNs .

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?

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

Hypotheses

Main article: Hypotheses

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

See also

• Radiation astronomy/Quiz

External links

• International Astronomical Union
• NASA/IPAC Extragalactic Database - NED
• The SAO/NASA Astrophysics Data System
• SDSS Quick Look tool: SkyServer
• SIMBAD Astronomical Database
• SIMBAD Web interface, Harvard alternate
• Universal coordinate converter

{{Astronomy resources}}{{History of science resources}}