Mastering Astronomy with Pearson eText -- ValuePack Access Card -- for The Essential Cosmic Perspective
7th Edition
ISBN: 9780321928375
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 16, Problem 51EAP
Galaxies at Great Distances. The most distant galaxies that astronomers have observed are much easier to see in infrared light than in visible light. Explain why that is the case.
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Infrared radiation from young stars can pass through the heavy dust clouds surrounding them, allowing astronomers here on Earth to study the earliest stages of star formation, before a star begins to emit visible light. Suppose an infrared telescope is tuned to detect infrared radiation with a frequency of 3.30 THz. Calculate the wavelength of the infrared radiation.
Be sure your answer has the correct number of significant digits.
The elliptical galaxy NGC 4889 is the largest galaxy in the Coma Cluster (shown in the image below taken by the Hubble Space Telescope). After analysing the spectrum of NGC 4889, an astronomer identifies a spectral line as being CaII (singly ionised Calcium) with a measured wavelength of 401.8 nm. The true, rest wavelength of this spectral line, measured in a lab, is 393.3 nm. What would be this galaxy’s recessional velocity, in km/s?
The elliptical galaxy NGC 4889 is the largest galaxy in the Coma Cluster (shown in the image below taken by the Hubble Space Telescope). After analyzing the spectrum of NGC 4889, an astronomer identifies a spectral line as being CaII (singly ionized Calcium) with a measured wavelength of 401.8 nm. The true, rest wavelength of this spectral line, measured in a lab, is 393.3 nm.
a) What would be this galaxy’s recessional velocity, in km/s?
b) Using a Hubble constant of ?0 = 70 km/s/Mpc, find the distance to this galaxy cluster. Give your answer in megaparsecs and in light-years.
c) How would your answer to part b) differ if the Hubble constant had a smaller value? A larger value? Explain.
Chapter 16 Solutions
Mastering Astronomy with Pearson eText -- ValuePack Access Card -- for The Essential Cosmic Perspective
Ch. 16 - Prob. 1VSCCh. 16 - Prob. 2VSCCh. 16 - Answer questions 1-3 based on Figure 16.18,...Ch. 16 - Prob. 4VSCCh. 16 - Prob. 5VSCCh. 16 - Prob. 6VSCCh. 16 - Prob. 7VSCCh. 16 - Prob. 1EAPCh. 16 - Prob. 2EAPCh. 16 - Prob. 4EAP
Ch. 16 - Prob. 3EAPCh. 16 - Prob. 5EAPCh. 16 - Prob. 6EAPCh. 16 - Prob. 7EAPCh. 16 - Prob. 8EAPCh. 16 - Prob. 9EAPCh. 16 - Prob. 10EAPCh. 16 - Prob. 11EAPCh. 16 - Prob. 12EAPCh. 16 - Prob. 13EAPCh. 16 - Prob. 14EAPCh. 16 - Prob. 15EAPCh. 16 - Prob. 16EAPCh. 16 - Prob. 17EAPCh. 16 - Prob. 18EAPCh. 16 - Prob. 19EAPCh. 16 - Prob. 20EAPCh. 16 - Prob. 21EAPCh. 16 - Prob. 22EAPCh. 16 - Prob. 23EAPCh. 16 - Prob. 24EAPCh. 16 - Prob. 25EAPCh. 16 - Prob. 26EAPCh. 16 - Prob. 27EAPCh. 16 - Prob. 28EAPCh. 16 - Prob. 29EAPCh. 16 - Prob. 30EAPCh. 16 - Prob. 31EAPCh. 16 - Prob. 32EAPCh. 16 - Prob. 33EAPCh. 16 - Prob. 34EAPCh. 16 - Prob. 35EAPCh. 16 - Prob. 36EAPCh. 16 - Prob. 37EAPCh. 16 - Prob. 38EAPCh. 16 - Prob. 39EAPCh. 16 - Prob. 40EAPCh. 16 - Prob. 41EAPCh. 16 - Prob. 42EAPCh. 16 - Prob. 43EAPCh. 16 - Prob. 44EAPCh. 16 - Unanswered Questions. Briefly describe one...Ch. 16 - Prob. 46EAPCh. 16 - Prob. 47EAPCh. 16 - Prob. 48EAPCh. 16 - Hubble’s Galaxy Types. How would you classify the...Ch. 16 - Prob. 50EAPCh. 16 - Galaxies at Great Distances. The most distant...Ch. 16 - Universe on a Balloon. In what ways is the surface...Ch. 16 - Prob. 53EAPCh. 16 - Prob. 54EAPCh. 16 - Prob. 56EAPCh. 16 - Prob. 57EAPCh. 16 - Prob. 58EAPCh. 16 - Prob. 59EAPCh. 16 - Prob. 60EAPCh. 16 - Prob. 61EAPCh. 16 - Prob. 62EAPCh. 16 - Prob. 63EAPCh. 16 - Prob. 64EAPCh. 16 - Prob. 65EAP
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