WK10_Hubble_Deep_Field

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Indiana University, Bloomington *

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105

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Astronomy

Date

Oct 30, 2023

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pdf

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Uploaded by AaronL001119

A105 – Stars and Galaxies Week 10 Explora8on Galaxies in the Hubble Deep Field Learning Goals: Students should be able to: • describe how galaxies are distributed in space. • iden7fy regions of high galaxy density. • interpret an astronomical image. STEP ONE: READ THE FULL ASSIGNMENT ON CANVAS. STEP TWO: Make distance distribu7on. This is the distance from us, not from one galaxy to another. For each galaxy with a measured redshiO (which tells us a distance) in the Hubble image, add an “X” on the line corresponding to its redshiO in the table below. Be systema7c. If you can print the image it is easier to cross the ones you’ve done. Need to do more than 60 galaxies for full credit [4 pt]. STEP THREE: Answer the ques7ons on the next page. ALL WORK IS INDIVIDUAL NAME: Aaron Lim RedshiE interval Add an “x” for each galaxy that lies in the corresponding redshiE interval 0.00 – 0.19 0.20 – 0.39 0.40 – 0.59 0.60 – 0.79 0.80 – 0.99 1.00 – 1.19 1.20 – 1.39 1.40 – 1.59 1.60 – 1.79 1.80 – 1.99 2.00 – 2.19 2.20 – 2.39 2.40 – 2.59 2.60 – 2.79

2.80 – 2.99 3.00 – 3.19 3.20 – 3.39 3.40 – 3.59 3.60 – 3.79 3.80 – 3.99 4.00 – 4.19 4.20 – 4.39 1. Find two galaxies in the image that APPEAR TO BE THE LARGEST AND BRIGHTEST, and list their redshiOs below. How do their redshiOs (=distances) compare to the redshiOs of other random galaxies in the image? [1 pt] Does this explain why they appear largest/brightest? How? (Note that the redshiO itself does not make a galaxy be brighter or not - it is just a measure of the distance.) [1 pt] 2. Find and examine the two galaxies at redshiO = 0.54 in the region where you can see a ligle square edge. These two galaxies appear different in size. Does this tell us anything about their true sizes? What exactly? [1 pt] 3. Look at your table. Are there redshiOs intervals (=distances) at which galaxies are more common? List three such redshiO intervals. What does this tell you about how galaxies are distributed in space? Is this consisent with the uniform distribu7on of galaxies in space? [1 pt] 4. Look at the lower leO part of the image. What are the galaxy types that correspond to galaxies with redshiOs 0.54, 0.32, 0.95 (bigger of the two with redshiO 0.95) and 0.47, in that order? [2 pt]

5. Extra credit. There is a bright star that appears next to the big orange galaxy at redshiO 0.52 (also lower leO region). There are two possibili7es regarding where this star is located (with respect to us and with respect to that galaxy), and depending on that, what the star may represent. What are these two possibili7es (or just one)? If you provided both possibili7es, which one would you consider more likely? Why?

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