Radiation astronomy/Intergalactic medium/Quiz

< Radiation astronomy < Intergalactic medium
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.

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, and in the course template. This should give you adequate background to get 100 %.

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Quiz

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

1. True or False, An intergalactic medium is a medium in between interplanetary and interstellar media.

TRUE
FALSE

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
Hubble Interacting Galaxy UGC 8335 (2008-04-24).jpg
Outflow from M82 galaxy.jpg
.
Stephan's Quintet with annotation.jpg
.
Local bubble.jpg
.
800 nasa structure renderin2.jpg
.
A2199 Xray Optical.jpg
.
Hubble Interacting Galaxy NGC 6050 (2008-04-24).jpg
.
Hubble Interacting Galaxy Arp 148 (2008-04-24).jpg
.

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

Your score is 0 / 0

Research

Hypothesis:

  1. The research of the intergalactic medium is under primarily astronomy branches astrochemistry and astrophysics.
  2. Intergalactic medium should be moved to Astronomy/Intergalactics.

Control groups

This is an image of a Lewis rat. Credit: Charles River Laboratories.

The findings demonstrate a statistically systematic change from the status quo or the control group.

“In the design of experiments, treatments [or special properties or characteristics] are applied to [or observed in] experimental units in the treatment group(s).[1] In comparative experiments, members of the complementary group, the control group, receive either no treatment or a standard treatment.[2]"[3]

Proof of concept

Def. a “short and/or incomplete realization of a certain method or idea to demonstrate its feasibility"[4] is called a proof of concept.

Def. evidence that demonstrates that a concept is possible is called proof of concept.

The proof-of-concept structure consists of

  1. background,
  2. procedures,
  3. findings, and
  4. interpretation.[5]

See also

References

  1. ↑ Klaus Hinkelmann, Oscar Kempthorne (2008). Design and Analysis of Experiments, Volume I: Introduction to Experimental Design (2nd ed.). Wiley. ISBN 978-0-471-72756-9. http://books.google.com/?id=T3wWj2kVYZgC&printsec=frontcover.
  2. ↑ R. A. Bailey (2008). Design of comparative experiments. Cambridge University Press. ISBN 978-0-521-68357-9. http://www.cambridge.org/uk/catalogue/catalogue.asp?isbn=9780521683579.
  3. ↑ "Treatment and control groups, In: Wikipedia". San Francisco, California: Wikimedia Foundation, Inc. May 18, 2012. Retrieved 2012-05-31.
  4. ↑ "proof of concept, In: Wiktionary". San Francisco, California: Wikimedia Foundation, Inc. November 10, 2012. Retrieved 2013-01-13.
  5. ↑ Ginger Lehrman and Ian B Hogue, Sarah Palmer, Cheryl Jennings, Celsa A Spina, Ann Wiegand, Alan L Landay, Robert W Coombs, Douglas D Richman, John W Mellors, John M Coffin, Ronald J Bosch, David M Margolis (August 13, 2005). "Depletion of latent HIV-1 infection in vivo: a proof-of-concept study". Lancet 366 (9485): 549-55. doi:10.1016/S0140-6736(05)67098-5. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1894952/. Retrieved 2012-05-09.

External links

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Development status: this resource is experimental in nature.
Educational level: this is a research resource.
Resource type: this resource is a quiz.
Subject classification: this is an astronomy resource.
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