Intergalactic medium/Quiz

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.

You are free to take this quiz based on the intergalactic medium at any time.

To improve your score, read and study the lecture, the links contained within, listed under See also, External links, and in the template. This should give you adequate background to get 100 %.

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Quiz
{Yes or No, An intergalactic medium is a medium in between interplanetary and interstellar media. - Yes + No
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{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 { G (i) } { C (i) }. { F (i) }. { E (i) }. { D (i) }. { A (i) }. { H (i) }. { B (i) }.
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{True or False, An intergalactic medium is a rarefied plasma rather than a gaseous medium. + TRUE - FALSE
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{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
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{Do we know enough about the intergalactic medium to trust measurements of background sources seen through foreground { structure (i) }?
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{Complete the text: Whether the thermal IGM is { collisional (i) } or collisionless at scales smaller than the scale { Coulomb (i) } scale depends on the effect of reduced { mean free path (i) } that is mediated by the plasma { instabilities (i) }.
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{True or False, Star clusters have been discovered to occur outside a galaxy. + TRUE - FALSE
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{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
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{True or False, O VI is a lithium-like ion. + TRUE - FALSE
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{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
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Hypotheses

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