Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Question
Chapter 4, Problem 10P
To determine
The typical rotation speed of outer parts of spiral galaxies.
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You observe the H-alpha line of Hydrogen in a distant galaxy to have a wavelength of 754.4 nm. What is the radial velocity of the galaxy?
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An astronomical image shows two objects that have the same apparent magnitude, i.e., the same brightness. However, spectroscopic follow up observations indicate that while one is a star that is within our galaxy, at a distance dgal away, and has the same luminosity as the Sun, the other is a quasar and has 100x the luminosity of the entire Milky Way galaxy. What is the distance to the quasar? (You may assume, for this rough calculation, that the Milky Way has 1011 stars and that they all have the luminosity as the Sun.) Give your response in Mpc. Value: dgal = 49 pc
Chapter 4 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 4 - Prob. 1QFRCh. 4 - Prob. 2QFRCh. 4 - Prob. 3QFRCh. 4 - Prob. 4QFRCh. 4 - Prob. 5QFRCh. 4 - Describe the Kelvin temperature scale.Ch. 4 - Prob. 7QFRCh. 4 - Prob. 8QFRCh. 4 - Prob. 9QFRCh. 4 - Prob. 10QFR
Ch. 4 - Prob. 11QFRCh. 4 - Prob. 12QFRCh. 4 - Prob. 1TQCh. 4 - Prob. 2TQCh. 4 - Prob. 3TQCh. 4 - Prob. 4TQCh. 4 - (4.3/4.4/4.5) Given that water absorbs microwaves...Ch. 4 - Prob. 6TQCh. 4 - Prob. 7TQCh. 4 - Prob. 8TQCh. 4 - Prob. 9TQCh. 4 - Prob. 10TQCh. 4 - (4.1) Use the Suns distance of 150 million...Ch. 4 - (4.1) Suppose you are operating a...Ch. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - (4. 6) Calculate the Doppler shift for blue light...Ch. 4 - Prob. 10PCh. 4 - (4.2) Which kind of light travels fastest? (a)...Ch. 4 - Prob. 2TYCh. 4 - Prob. 3TYCh. 4 - Prob. 4TYCh. 4 - Prob. 5TYCh. 4 - Prob. 6TYCh. 4 - Prob. 7TYCh. 4 - Prob. 8TYCh. 4 - What is Galilean relativity? Give an example of...Ch. 4 - Prob. 2EQFRCh. 4 - Prob. 3EQFRCh. 4 - Prob. 4EQFRCh. 4 - What is meant by panspermia?Ch. 4 - Prob. 6EQFRCh. 4 - Prob. 7EQFRCh. 4 - Prob. 1ETQCh. 4 - Prob. 2ETQCh. 4 - Prob. 3ETQCh. 4 - Prob. 1EPCh. 4 - Mercury orbits the Sun at speeds ranging from 59...Ch. 4 - Prob. 3EPCh. 4 - Prob. 1ETYCh. 4 - The Miller-Urey experiment demonstrated that (a)...Ch. 4 - Prob. 3ETYCh. 4 - Prob. 4ETYCh. 4 - Prob. 5ETY
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- The nearest neutron star (a collated star made primarily of neutrons) is about 3.00 1018 m away from Earth. Given that the Milky Way galaxy (Fig. P1.81) is roughly a disk of diameter 1021 m and thickness 1019 m, estimate the number of neutron stars in the Milky Way to the nearest order of magnitude. Figure P1.81arrow_forwardThe first clue that the Galaxy contains a lot of dark matter was the observation that the orbital velocities of stars did not decreases with increasing distance from the center of the Galaxy. Construct a rotation curve for the solar system by using the orbital velocities of the planets, which can be found in Appendix F. How does this curve differ from the rotation curve for the Galaxy? What does it tell you about where most of the mass in the solar system is concentrated?arrow_forwardAssume that the Sun orbits the center of the Galaxy at a speed of 220 km/s and a distance of 26,000 lightyears from the center. A. Calculate the circumference of the Sun’s orbit, assuming it to be approximately circular. (Remember that the circumference of a circle is given by 2pR, where R is the radius of the circle. Be sure to use consistent units. The conversion from light-years to km/s can be found in an online calculator or appendix, or you can calculate it for yourself: the speed of light is 300,000 km/s, and you can determine the number of seconds in a year.) B. Calculate the Sun’s period, the “galactic year.” Again, be careful with the units. Does it agree with the number we gave above?arrow_forward
- The center of a faint but active galaxy has magnitude 26. How much less bright does it look than the very faintest star that our eyes can see, roughly magnitude 6?arrow_forwardMost distances in the Galaxy are measured in light-years instead of meters. Why do you think this is the case?arrow_forwardWhy does the disk of a spiral galaxy appear dark when viewed edge on?arrow_forward
- Does an elliptical galaxy rotate like a spiral galaxy? Explain.arrow_forwardConsider the following data on four stars: Which star would have the largest radius? Which star would have the smallest radius? Which star is the most common in our area of the Galaxy? Which star is the least common?arrow_forward[6/2, 7:18 AM] Ali Diaa: Telescopes are an essential tool for astronomers to study the universe. You plan to build yourown telescope that can resolve the Great Red Spot on the surface of Jupiter at a wavelength of600 nm. The farthest distance between the Earth and Jupiter is 968 × 106 km and the Great RedSpot has currently a diameter of 16,500 km.(a) Use the Rayleigh criterion to determine the diameter of the lens’ aperture of your telescopethat is needed to resolve the Great Red Spot on Jupiter.[6/2, 7:44 AM] Ali Diaa: Scientists are developing a new space cannon to shoot objects from the surface of the Earth directly into a low orbit around the Earth. For testing purposes, a projectile is fired with an initialvelocity of 2.8 km/s vertically into the sky.Calculate the height that the projectile reaches, ...(a) assuming a constant gravitational deceleration of 9.81 m/s2.(b) considering the change of the gravitational force with height.Note: Neglect the air resistance for this problem.…arrow_forward
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