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Bundle: Foundations of Astronomy, Enhanced, Loose-Leaf Version, 13th + MindTap Astronomy, 2 terms (12 months) Printed Access Card
13th Edition
ISBN: 9781337214353
Author: Seeds, Michael A., Backman, Dana
Publisher: Cengage Learning
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Question
Chapter 16, Problem 3DQ
To determine
How the metal rich gas clouds are contradict the evolution of galaxy.
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Suppose you have obtained spectra of several galaxies and have measuerd the observed wavelength of the H-Alpha line (rest wavelength = 656.3 nm) to be
Galaxy 1: 658.1 nm.
Galaxy 2: 667.1 nm.
Galaxy 3: 677.6 nm.
Assuming a Hubble Constant of 72.5 km/s/Mpc, calculate the distance to each of these galaxies (answer in Mpc)
Suppose you have obtained spectra of several galaxies and have measuerd the observed wavelength of the H-Alpha line (rest wavelength = 656.3 nm) to be
Galaxy 1: 658.1 nm.
Galaxy 2: 667.1 nm.
Galaxy 3: 677.6 nm.
Calculate the redshift, z, for each galaxy.
If a galaxy is 18 Mpc from Earth and the Hubble constant is 70 km/s/Mpc, what is the recession velocity of the galaxy (in km/s)?
A galaxy is receding from Earth at a speed of 300 km/s and the Hubble constant is 70 km/s/Mpc. What is the distance to the galaxy (in Mpc)?
Chapter 16 Solutions
Bundle: Foundations of Astronomy, Enhanced, Loose-Leaf Version, 13th + MindTap Astronomy, 2 terms (12 months) Printed Access Card
Ch. 16 - Prob. 1RQCh. 16 - Of the nearby galaxies, which is the most common...Ch. 16 - Prob. 3RQCh. 16 - My center is round, and I have no spiral arms...Ch. 16 - Prob. 5RQCh. 16 - Which are more common, barred or nonbarred spiral...Ch. 16 - Prob. 7RQCh. 16 - Prob. 8RQCh. 16 - Prob. 9RQCh. 16 - Prob. 10RQ
Ch. 16 - Prob. 11RQCh. 16 - Prob. 12RQCh. 16 - Prob. 13RQCh. 16 - Prob. 14RQCh. 16 - Prob. 15RQCh. 16 - Prob. 16RQCh. 16 - Prob. 17RQCh. 16 - Prob. 18RQCh. 16 - Prob. 19RQCh. 16 - Prob. 20RQCh. 16 - Prob. 21RQCh. 16 - What is the percentage range of galaxy diameters...Ch. 16 - What is the percentage range of galaxy masses...Ch. 16 - Prob. 24RQCh. 16 - Prob. 25RQCh. 16 - Prob. 26RQCh. 16 - Prob. 27RQCh. 16 - Prob. 28RQCh. 16 - Prob. 29RQCh. 16 - Prob. 30RQCh. 16 - Prob. 31RQCh. 16 - Prob. 32RQCh. 16 - Prob. 33RQCh. 16 - Prob. 34RQCh. 16 - Prob. 1DQCh. 16 - Prob. 2DQCh. 16 - Prob. 3DQCh. 16 - Prob. 4DQCh. 16 - Prob. 1PCh. 16 - Prob. 2PCh. 16 - Prob. 3PCh. 16 - Prob. 4PCh. 16 - Prob. 5PCh. 16 - Prob. 6PCh. 16 - Prob. 7PCh. 16 - Prob. 8PCh. 16 - Prob. 9PCh. 16 - Prob. 10PCh. 16 - Prob. 11PCh. 16 - Prob. 12PCh. 16 - Prob. 13PCh. 16 - Prob. 14PCh. 16 - Prob. 15PCh. 16 - Prob. 16PCh. 16 - Prob. 1LTLCh. 16 - Prob. 2LTLCh. 16 - Prob. 3LTLCh. 16 - Prob. 4LTLCh. 16 - Prob. 5LTLCh. 16 - Prob. 6LTL
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- According to Hubble’s law, what is the recessional velocity of a galaxy that is 108 light-years away from us? (Assume a Hubble constant of 22 km/s per million light-years.)arrow_forwardWhat are the two best ways to measure the distance to a distant, isolated spiral galaxy, and how would it be measured?arrow_forwardIf we now realize dwarf ellipticals are the most common type of galaxy, why did they escape our notice for so long?arrow_forward
- Suppose that stars evolved without losing mass-that once matter was incorporated into a star, it remained there forever. How would the appearance of the Galaxy be different from what it is now? Would there be population I and population II stars? What other differences would there be?arrow_forwardWhat is the difference between, (a)Sa and Sb galaxy, (b) between and S0 and an Sa galaxy, (c) between Sb and SBb galaxy, (d) between an E7 and E0 galaxy.arrow_forwardIf a galaxy is 8.9 Mpc away from Earth and recedes at 497 km/s, what is H. (in km/s/Mpc)? km/s/Mрс What is the Hubble time (in yr)? years How old (in yr) would the universe be, assuming space-time is flat and the expansion of the universe has not been accelerating? years How would acceleration change your answer? If the expansion of the Universe has been accelerating, the Universe could be substantially younger than the value entered above. If the expansion of the Universe has been accelerating, the Universe could be substantially older than the value entered above.arrow_forward
- Which of the following best describe the reasons we have to infer that a supermassive blackhole lurks in the centre of our galaxy? Stars keep disappearing from view as they get swallowed up in the galactic centre. Tight orbit of stars around an invisible companion & giant bubbles of cold, star forming gas have been expelled from galactic centre. We can measure the gravitational waves coming from such an enormous black hole. O Tight orbit of stars around an invisible companion & giant bubbles filled with gamma rays expelled from the galactic centre.arrow_forwardThe goal of the project is to find as many of the valuable images of galaxy collisions as possible while minimising the time invested in classification by the experts — they really don’t want to go through all of the “test negative” images to find a significant number of missed collisions. In order to better understand the capabilities of several citizen scientists for future projects, an expert classified all of the images in the library. From this information, the sensitivity and specificity of citizen scientists Beta, Gamma, and Delta in identifying images of galaxy collisions are shown in the table. Who do you think has the best performance given the goals of the project? Justify your answer.arrow_forwardSuppose that while analysing the optical spectrum of a galaxy, you observe the Hα absorption line to be located at a wavelength of 702 nm. Use the fact that the rest wavelength of this line is 656 nm to calculate the radial velocity of the galaxyin units of km/s. Then, use Hubbles Law (assuming the Hubble Constant to be H0 = 74 km/s/Mpc) to convert the radialvelocity measurement into a distance estimate (in units of Mpc).arrow_forward
- Calculate the distance to a galaxy that is moving away at 1000 km.9s-1. Given the Hubble time as 16.9 Billion years.arrow_forwardSuppose you want to observe every galaxy within some distance. Your enterprising assistant says that instead you can observe every galaxy within double the original distance. What is the ratio of the number of galaxies you can now observe as opposed to before? (For example, if you can observe twice as many: 2. If you can observe half as many: 0.5) Your answerarrow_forwardSuppose you have obtained spectra of several galaxies and have measured the observed wavelength of the H-Alpha line (rest wavelength = 656.3 nm) to be Galaxy 1: 658.1 nm. Galaxy 2: 667.1 nm. Galaxy 3: 677.6 nm. Calculate the radial velocity of each of these galaxies.arrow_forward
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