lab 8 report (1) filled out

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Astronomy

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Apr 3, 2024

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Properties of Galaxies 12/11/2022 Grouping Galaxies Based on Appearance 1. When you have sorted the galaxies to your satisfaction, save a JPG-format copy of the mosaic and add it to your lab report here. Place your JPG-format image of the sorted galaxy mosaic here. 2. Add a detailed explanation which describes the key properties of the galaxies assigned to each row of your mosaic (such as “Row #1: Galaxies have a uniform golden color, no clear features or substructures, and elliptical shapes.”). If there were particular cases which you found most perplexing (such as a galaxy that seemed to belong equally well to two rows), make a note of them as well. (For example, “The last galaxy on the right in row #2 could have gone in row #3 as well, if I prioritized shape over color.”) Replace this text. 3. Save a JPG-format copy of your partner's mosaic and add it to your lab report. Place your partner’s JPG-format image of the sorted galaxy mosaic here. 4. Describe your sorting partner. Are they a man or a woman, or a boy or a girl? (If a child, please tell us their age.) Are they engaged in a profession where attention to detail is critical (such as seamstress or electronics technician), or are they Big Picture people? Are they color blind? Have they ever looked at pictures of galaxies before? Sorting partner is a female. They are not in a profession that requires attention to detail. She is not color blind and has never intentionally looked at pictures of galaxies before. 5. Describe the differences and the similarities between your two final galaxy mosaics. Did you agree broadly, or did you focus on very different aspects of the images? Can you each understand what the other did? We agreed broadly, and I grouped them by shapes and size. She mostly used color and I can see why each of us did that Galaxy Morphology Questions Please remove incorrect choices, as well as surrounding parentheses and slashes, in the questions below (and delete this instruction).
1. A galaxy emitting lots of blue light must contain many ( hot), ( high-) mass ( long- ) lived stars. The stellar classification of these blue stars is ( O and B ) . 2. Galaxies which appear more disturbed tend to have ( higher ) asymmetry indices, and ( bluer ) colors. 3. Elliptical galaxies tend to be ( redder ), ( more ) massive, and contain ( less ) gas than spiral galaxies. Their concentration indices are ( higher ), while their asymmetry indices are ( lower ). 4. The Milky Way is a replace this text galaxy, with a sub-classification of ( Sb ). It also has a central bar 5. It is much easier to trace the spiral arm structure on a(n) ( fa ce-on ) spiral galaxy than on a(n) ( edge-on ) one. 6. The force which binds all of the stars and gas in a galaxy together is the Gravitational force. Imaging Tool Questions 1. Save a copy of the final galaxy data table and include it in your lab report. Place your JPG-format table of galaxy imaging data here. 2. Note the “ripples” that appear at large radii in the radial counts profile for Galaxy #1. What do you think causes them? The distribution of light is represented by the ripples. 3. Galaxy #1 Comments: no bar or spiral arms. 4. Galaxy #2 is far less luminous than our Milky Way. How many galaxies of this luminosity would you need to match the light output of the Milky Way? About 20 galaxies 5. Notice how the light profile (the radial plot of counts) can be divided into an inner region and an outer region (with a change of slope between them). The names for the two galaxy components that these two regions represent are the inner circle and the outer circle.
6. What do you think causes the patches of blue in the outer regions of this galaxy? I think the formation of new stars is the cause of the patches of blue in the outer regions. Along with dust clouds and blue stars 7. Galaxy #2 Comments : this galaxy is smaller than the other so my guess is that its younger than the others. Faint blue 8. Does Galaxy #3 have a fairly uniform color? ( yes ) 9. Galaxy #3 Comments: its hard to make out the other stars in this one, and it looks like there is a core 10. Consider the total B-V color measured across all of Galaxy #4. What value do you find if you reduce the size of the ellipse to contain just the bright golden nucleus of the galaxy? What types of galaxies have this B-V color overall? Ellipitcal galaxies 1.06 B-V. 11. Galaxy #4 Comments: I would call this core bright yellow and it has lots of blue stars in it. Looks like a clear spiral galaxy too 12. What do you think this object (Galaxy #5) might have looked like a few billion years ago? My guess is it would have looked like a spiral galaxy 13. Galaxy #5 Comments: This is definitely one of the larger ones . 14. Note the dark band running along the disk of Galaxy #6, and the bright splotch slightly offset from the center as defined by the rest of the galaxy. These factors will lead to a ( lower ) asymmetry index. 15. Galaxy #6 Comments: ellipitical and uniform gold coloring 16. Does the edge-on orientation of Galaxy #7 make it more difficult for us to calculate an asymmetry index, and to define a morphological type? Yes, the edge-on orientation makes it more difficult 17. Galaxy #7 Comments: it’s hard to see the whole galaxy entirely. Cloudy 18. A larger neighboring galaxy above our target (Galaxy #8) scatters light across this entire
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