University:
University of Toronto
Course:
AST201 | Exploring the Universe
Academic year:

2023
Views:

360

Pages:

7
Author:

Arlene R.

1. Classify the following three galaxies. First determine whether the galaxy is spiral, elliptical, lenticular or irregular. Then, if spiral or elliptical the Hubble classification (e.g. Sa / SBc / E0 / E4 / etc.). Write a few notes on which features you used to determine the classification of each. These can be bullet points or full sentences but should detail why you chose the classification you picked. I. II. III. Page 1 of 4 2. You observe a Cepheid variable star with a pulsation period of 31 days, located in a nearby galaxy. The star’s apparent brightness is measured to be 1.4 x 10^-12 W/m^2. Calculate the distance to the host galaxy of the Cepheid variable star. Page 2 of 4 3. Suppose you capture the spectrum of a distant galaxy and measure its redshift. The measurement implies that the galaxy is moving away from the Milky Way at a velocity of 18 000 km/s. Use Hubble’s law to determine the distance to the galaxy. Page 3 of 4 4. The James Webb space telescope has recently (as of 2022) beaten the record for the most distant galaxy ever discovered. Its designation is JADES-GS-z13-0. It is described in a paper by Brandt Robertson et al. (2022) which can be found here Links to an external site. Skim through the paper and try to find answers to the following questions. [2 points per question] I. What is the redshift (with uncertainties) of this galaxy? II. What is the mass of the galaxy? III. What is the star formation rate of the galaxy? Page 4 of 4

Galaxy Classification. Homework Assignment 3

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