Lab10 Worksheet

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Collin County Community College District *

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1403

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Astronomy

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Dec 6, 2023

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PHYS 1403 Lab 10: CENTER OF THE GALAXY Worksheet Enter your answers to each question in the data tables and yellow highlighted areas below. When completed, please save and upload this file to the assignment – Lab 10 – in Canvas. PRELAB QUESTIONS 1. What is meant by a “geocentric” model? Its known as that the earth was the center of the universe 2. What is meant by a “heliocentric” model? Was the thought that the sun was the center of the universe and that the planets revolve around the sun 3. What were the main arguments made (by Aristotle) against the heliocentric model? That its not possible to feel the earth move 4. What is the difference between the “Galaxy” and the “Universe”? The galaxy has stars dark matter and gas while the universe has so much more 5. How will we determine the location of the center of our galaxy in today’s lab? Plotting locations of globular clusters 1

EXERCISE 1. Fill out the two data columns in Table #1 using Stellarium to find the RA, and reliable sources (e.g. textbook, Wikipedia) to find the distance. Then, use the data in Table #1 to plot the location of the globular clusters on Graph #1. Right Ascension (RA) goes in a counter-clockwise direction. That is, RA 0 h is at the top, 6 h is directly to the left, 12 h is straight down, and 18 h is directly to the right. Distance increases outward from the center. The rings represent increments of 2 kpc, such that the inner most ring is 2 kpc and the outer most ring is 12 kpc. You don’t have to label each point… just make a dot. Take a picture of your graph with a digital camera or cell phone camera, and paste the picture in the space below: Paste picture here 2. From Graph #1, determine the direction that you believe to be towards the center of the Galaxy. What is the RA of that direction? How did you determine that direction from the graph? The far right is the direction the seems to be toward the center 3. The center of the Milky Way actually lies in the direction of the constellation Sagittarius, at a Right Ascension of 17.75 hours. How does this compare with your results? Based on this comparison, do you feel that using globular clusters to locate the direction of the galactic center is accurate? Why or why not? The points are between 17 and 18 hour ra so I do believe that the globular clusters are located the galactic center 4. From Graph #1, estimate the distance to the center of the Galaxy. What is the distance? How did you determine the distance from the graph? 8.5 kpc by measurement 5. The actual distance to the center of the galaxy is 7.6 kpc. How does this compare with your results? Based on this comparison, do you feel that using globular 2

clusters to locate the distance to the galactic center is accurate? Why or why not? I think that the globular clusters are not that far off Table #1 Globular Cluster Right Ascension (Hours) Distance (kpc) NGC 362 1 hour 3 min 8.500 kpc NGC 1851 5 hour 14 min 12.100 kpc NGC 2808 9 hour 17 min 9.2 kpc NGC 3201 10 hour 18 min 5.00 0kpc NGC 4372 12 hour 18 min 5.800 kpc NGC 6352 17 hour 26 min 6.000 kpc NGC 6362 17 hour 26 min 7.1 kpc NGC 6440 18 hour 28 min 8.5 kpc NGC 6496 18 hour 11.3 kpc NGC 6528 18 hour 5 min 7.3 kpc NGC 6553 18 hour 10 min 5.9 kpc NGC 6624 18 hour 24 min 8.5 kpc NGC 6642 18 hour 33 min 6.2 kpc NGC 6712 18 hour 54 min 7.6 kpc NGC 6752 19 hour 12 min16 hour 24 min 4.000 kpc M 4 16 hour 24 min 2.2000 kpc M 5 15 hour 19 min 7.500 kpc M 10 16 hour 58 min 4.400 kpc M 13 16 hour 42 min 6.8 kpc M 14 17 hour 38 min 9.300 kpc M 15 21 hour 30 min 10.000 kpc M 19 17 hour 3 min 8.800 kpc M 30 21 hour 41 min 8.300 kpc M 55 19 hour 41 min 5.400 kpc M 80 16 hour 18 min 10.000 kpc M 92 17 hour 17 min 8.200 kpc 3

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M 107 16 hour 33 min 6.400 kpc 47 Tuc 0 hour 24 min 4.6 kpc ω (omega) Cen 13 hour 42 min .422 kpc 4

GRAPH #1 LOCATION OF GLOBULAR CLUSTERS RELATIVE TO THE EARTH 5

Lab10 Worksheet

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