Exam 23: Large-Scale Structure in the Universe

Panel (b) of the figure below shows the enhanced infrared glow obtained after nearby stars and galaxies are subtracted from a standard Spitzer Space Telescope exposure.Scientists ascribe this faint signature to

Explain why dark matter dominates the halos of galaxies but does not play a role in the formation of small structures (stars, planets, etc.) within galaxies.

Quantum fluctuations in the early universe

Where would a newly-discovered ultrafaint galaxy most likely be found?

Why do astronomers think that cold dark matter (as opposed to hot dark matter) is the primary component of dark matter in galaxies?

Our galaxy is part of the ________ Supercluster.

If dark energy is embedded within the vacuum of space, then the best places to study it would probably be the

In the early universe, why were inhomogeneities in the distribution of normal matter much smaller than inhomogeneities in the dark matter?

Spiral galaxies

Which of the following must be true about the very first stars?

Name and describe one candidate for hot dark matter and one for cold dark matter.Be certain to explain why each is a dark matter candidate.

Which of these lists shows the correct chronological order of the events listed, starting with the earliest and ending with the most recent?

An astronomer wants to study the epoch of reionization, which occurred roughly in the range of 6 $\lt$ z $\lt$ 11.What range of wavelength must the astronomer be able to detect corresponding to light emitted at 500 nm?

At what redshift would a quasar's emission line emitted at 121.6 nm show up at the "normal" wavelength of 486.1 nm of the Balmer H $\alpha$ line?

You observe two galaxy clusters, cluster A and cluster B.If the outer galaxies of both clusters have the same circular velocities, but cluster A has twice the mass of cluster B, then the size of cluster A must be

The most distant galaxies detected at z 10 are best observed with ________ wavelengths of light.

What was temperature and wavelength of the cosmic background blackbody signature at the epoch of reionization, about 400 million years after Big Bang (z ~ 11)?

Each of these statements describes the steps that occur during star formation.Which of these is NOT also true for galaxy formation?

Which of the following statements about galaxy and star formation is true?

How are the observed properties of the CMB leading to the idea that dark matter plays a crucial role in the formation of structure in the universe?