Intergalactic medium/Quiz

UGC 5101 is a peculiar galaxy with a single nucleus contained within an unstructured main body that suggests a recent interaction and merger. Credit: NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University).

Intergalactic medium is a lecture and an article studying the entity that exists between galaxies. It is also a mini-lecture for a quiz section as part of the astronomy department course on the principles of radiation astronomy.

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Quiz

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Ignore the questions' coefficients:

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

	Yes
	No

2 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

File:Outflow from M82 galaxy.jpg .

File:Stephan's Quintet with annotation.jpg .

.

.

File:A2199 Xray Optical2.jpg .

.

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

	TRUE
	FALSE

4 Which of the following is not a characteristic of X-radiation in the IGM?

	X-rays come from the IGM
	an X-ray background
	shock heating
	secondary ionizations and excitations
	far more likely to be absorbed by He I rather than H I

5 Do we know enough about the intergalactic medium to trust measurements of background sources seen through foreground

?

6 Complete the text:

Whether the thermal IGM is or collisionless at scales smaller than the scale scale depends on the effect of reduced that is mediated by the plasma .

7 True or False, Star clusters have been discovered to occur outside a galaxy.

	TRUE
	FALSE

8 Which of the following are phenomena associated with strong forces in the IGM?

	stochastic acceleration
	hottest clusters
	scaling of the acceleration efficiency with IGM temperature
	collisionless IGM
	placid magnetic compressions
	the smaller the mean free path
	cold regions
	least effective for inducing the instability

9 True or False, O VI is a lithium-like ion.

	TRUE
	FALSE

10 Which of the following are phenomena associated with electromagnetic cascades?

	spectral and timing properties of astronomical sources
	very high-energy γ-rays
	the way from the source to the Earth
	soft X-rays
	redshifts
	ambient radiation fields inside the γ-ray source
	source stability
	protons

Hypotheses

Main resource: Hypotheses

1. The research of the intergalactic medium is under primarily astronomy branches astrochemistry and astrophysics.

See also

• Astronomy/Quiz
• Green astronomy/Quiz
• Planetary science/Quiz
• Radiation astrochemistry/Quiz
• Radiation astrogeography/Quiz
• Radiation astrohistory/Quiz
• Radiation astronomy/Quiz
• Theoretical radiation astronomy/Quiz

External links

• International Astronomical Union
• NASA/IPAC Extragalactic Database - NED
• NASA's National Space Science Data Center
• The SAO/NASA Astrophysics Data System
• SDSS Quick Look tool: SkyServer
• SIMBAD Astronomical Database
• SIMBAD Web interface, Harvard alternate
• Spacecraft Query at NASA
• Universal coordinate converter

{{Principles of radiation astronomy}}