The Cosmic Perspective (9th Edition)
The Cosmic Perspective (9th Edition)
9th Edition
ISBN: 9780134874364
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 20, Problem 52EAP

(a)

To determine

Redshifts of the galaxies.

(b)

To determine

Velocities of the galaxies.

(c)

To determine

The distances of the galaxies

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The figure below shows the spectra of two galaxies A and B.  Please can i get help  with this questions below:  1. Which of these galaxies has ongoing star formation? How can you tell?2. One of these galaxies has Hubble type E3 while the other is SBb. Which is which? What does the 3 inE3 tell you about the galaxy? What does the SB in SBb tell you about the galaxy?3. What effects would dust have on the two spectra?4. Which galaxy would you expect to have more far-infrared emission? Expl
Determine the wavelength of the standard 21-cm hydrogen spectral line that we receive from the galaxy described in the preceding problem. Could such a large redshift lead astronomers to mistake this spectral line for another one that has an intrinsically longer wavelength?
How astronomers determine the distance of a galaxy? Explain.

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The Cosmic Perspective (9th Edition)

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