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 43EAP
To determine
The types of galaxies using the system illustrated in figure.
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The figure below shows the spectra of two galaxies A and B.
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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
How astronomers determine the distance of a galaxy? Explain.
The figure below shows the spectra of two galaxies A and B.
Chapter 20 Solutions
The Cosmic Perspective (9th Edition)
Ch. 20 - Prob. 1VSCCh. 20 - Prob. 2VSCCh. 20 - Prob. 3VSCCh. 20 - Prob. 4VSCCh. 20 - Use the following questions to check your...Ch. 20 - Prob. 6VSCCh. 20 - Why do we need to understand the evolution of the...Ch. 20 - Prob. 2EAPCh. 20 - Prob. 3EAPCh. 20 - Prob. 4EAP
Ch. 20 - Prob. 9EAPCh. 20 - Prob. 10EAPCh. 20 - Prob. 11EAPCh. 20 - Prob. 12EAPCh. 20 - Prob. 13EAPCh. 20 - What is the cosmological horizon, and what...Ch. 20 - Prob. 15EAPCh. 20 - Prob. 16EAPCh. 20 - Prob. 17EAPCh. 20 - Prob. 18EAPCh. 20 - Prob. 19EAPCh. 20 - Decide whether the statement makes sense (or is...Ch. 20 - Prob. 21EAPCh. 20 - Prob. 22EAPCh. 20 - Prob. 23EAPCh. 20 - Prob. 24EAPCh. 20 - Prob. 25EAPCh. 20 - Choose the best answer to each of the following....Ch. 20 - Prob. 27EAPCh. 20 - Choose the best answer to each of the following....Ch. 20 - Prob. 29EAPCh. 20 - Prob. 30EAPCh. 20 - Prob. 31EAPCh. 20 - Choose the best answer to each of the following....Ch. 20 - Choose the best answer to each of the following....Ch. 20 - Choose the best answer to each of the following....Ch. 20 - Prob. 35EAPCh. 20 - Prob. 38EAPCh. 20 - Prob. 41EAPCh. 20 - Prob. 42EAPCh. 20 - Prob. 43EAPCh. 20 - Prob. 45EAPCh. 20 - Prob. 46EAPCh. 20 - Prob. 47EAPCh. 20 - Prob. 48EAPCh. 20 - Prob. 51EAPCh. 20 - Prob. 52EAPCh. 20 - Prob. 53EAPCh. 20 - Prob. 54EAPCh. 20 - Extremely Distant Galaxies. The most distant...Ch. 20 - Stretching of the Universe. The most distant white...
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- What are the characteristics of an E7 Galaxy? What about E0 galaxy? Explain.arrow_forwardTrue or False: Dwarf elliptical galaxies and giant ellipticals probably formed in entirely different ways.a. Trueb. Falsearrow_forwardEach point on the above diagram shows the line-of-sight recession velocity versus distance for a number of distant galaxies. Describe how the recession velocities of galaxies are measured by astronomers. Explain the different techniques used by astronomers to measure the distances to galaxies, and describe how these methods are used to construct the distance ladder.arrow_forward
- An astronomer observed the motions of some galaxies. Based on his observations, he made the following statements. Which one of them is most likely to be false? Take Hubble's constant to be 67 km/s/Mpc. A. A galaxy observed to be moving away from us at a speed of 70 km/s is at a distance of about 1 Mpc from us. B. A galaxy observed to be moving away from us at a speed of 700 km/s is at a distance of about 10 Mpc from us. C. A galaxy observed to be moving away from us at a speed of 7000 km/s is at a distance of about 100 Mpc from us. D. A galaxy observed to be moving away from us at a speed of 70000 km/s is at a distance of about 1 Gpc from us. Is the answer D? Thank you!arrow_forwardRead the questions slowly and answer with precise and long details about each of the questions. Answer correctly and follow my guidelines for a long and wonderful review after results. Your target/main observable galaxy is the whirlpool galaxy. Target: Whirlpool Galaxy Object Type: Galaxy Distance: 37 million light-years Constellation: Canes VenaticiDO NOT COPY AND PASTE OTHER WORK OR THINGS FROM THE INTERNET, use your own words. In 500 words, compare and contrast the specific object to at least 2 other objects in its sourceclass (eg. if it's an isolated star, to different types of isolated stars). Explain both observational andphysical differences, as well as what the comparison teaches us about the source class in general.arrow_forwardChoose the statement that is NOT true of a galaxy. O Galaxies take different shapes depending on how the stars are distributed and oriented. O Agreat island of stars held together by gravity. All galaxies are basically of the same shape and consist mainly of a discs and a halos. All the stars in a galary orbit a common centerarrow_forward
- Estimating the mass of the Milky Way a) Assuming the Sun moves in a circular orbit of radius 8 kiloparsecs around the center of the Milky Way, and that its orbital speed is 220 km/s, calculate how many years it takes the Sun to complete one orbit of the Galaxy. Remember to convert kiloparsecs to kilometers. b) Using the modified form of Kepler's third law (introduced in Lecture 13, for measuring the combined masses of binary stars), R³ m+ M = estimate the mass of the Milky Way enclosed within 8 kpc (Sun's orbit radius). The mass of the Milky Way inside p² I the Sun's orbit can be represented as a single mass (M) located at its center, and the mass of the Sun (m) can be considered infinitesimally small compared to the Milky Way's (i.e., m < M). c) Is this estimate of the Milky Way's mass an upper or lower limit? Explain your reasoning.arrow_forwardAs we discussed, clouds are made of a great many small drops. Really - a great many. Imagine a liquid cloud that fills a volume of 1 km3. The clouds contains 100 drops per cubic centimeter; for the sake of argument assume that each is 10 microns (micrometers) in radius. A. How many drops does the cloud contain? Compare this to a big number - say, the number of stars in the galaxy. B. What mass of water does the cloud contain? Compare this to something big - elephants, trucks, that sort of thing. C. What fraction of the cloud volume is filled with condensed water? One way to approach this is to compare the density of the suspended liquid water to the density of the surrounding air. D. How many 1 mm drizzle drops could you make from all the cloud drops? E. How much energy was released when this water condensed from vapor to liquid? If the water condensed in 20 minutes (a reasonable lifetime for a small cloud), what was the (energy per time)? powerarrow_forwardA star at a distance of 50000 light years from the center of a galaxy has an orbital speed of 100 km/s around the galactic center. What is the total mass of the galaxy located at distances smaller than 50000 light years from the center? A. 7.6 ×1010 solar masses B. 4.2 ×1011 solar masses C. 3.5 ×1010 solar masses D. 1.4 ×1011 solar masses Is the answer C? M = (r x v^2) / G = 50000 x 9.46e15 x (100000^2) / 6.67e-11 / 2e30 (the Sun's mass) = 3.55e10 solar massesarrow_forward
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