The time taken in merging the elliptical galaxies to form spiral galaxies.

Question

Want to see the full answer?

Answer 1

Question

Chapter 23, Problem 38QP

To determine

The time taken in merging the elliptical galaxies to form spiral galaxies.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

1. The current (critical) density of our universe is pe = 10-26kg/m³. Assume the universe is filled with cubes with equal size that each contain one person of m = 100kg. What would the length of the side of such a cube have to be in order to give the correct critical density? How many hydrogen atoms would you need in a box of 1 m³ to reach the critical density? The matter we know, which consists mostly of hydrogen, constitutes only 4.8% of the current critical energy density of our universe. So how many hydrogen atoms are actually in a box of 1 m3 in our universe? Deep space is very empty and a much better vacuum than we can obtain on earth in a laboratory.

2. A galaxy cluster has a galaxy behind it whose image we see as being smeared out and curved, with an angular radius of curvature on the sky of θE. The background galaxy is at redshift zgal and the cluster is at zclust. What is the mass of the cluster in solar masses? Give your response in scientific notation with one decimal place. (The Hubble constant is of course 70 km/s/Mpc, and you can assume the Hubble law for these low redshifts). Values: zgal = 0.11 zclust = 0.07 θE = 117.4 arcseconds

Indicate whether the following statements are most true for elliptical or spiral galaxies. (Select S-Spiral, E-Elliptical. If the first is S and the rest E, enter SEEEEE). A) Are more bluish in color. B) Has no current star formation. C) Most numerous type in the Universe. D) Contain abundant clouds of cool gas and dust. E) Are rare in the central regions of galaxy clusters. F) Contain no hot, massive stars. G) Most are roughly similar in size and mass.