UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 23, Problem 9CC
To determine
The galaxy that has a larger redshift according to Hubble flow, if the galaxies are at 100 Mpc and 200 Mpc, using the figure given below:
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Imagine that an observed distant galaxy is measured to have a distance of 40 Mpc by a Type Ia supernovae and the redshift of the galaxy indicates the galaxy appears to be moving away from us at a speed of 2400 km/s. What would the Hubble constant be if measured solely based on this galaxy in units of km/s/Mpc?
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)?
What is the redshift z of a galaxy 172 Mpc away from us?
Note: Assume a value of the Hubble constant of 71.1 km/s/Mpc
Round your answer to three decimal places.
Chapter 23 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
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- Suppose we could measure the distance to a galaxy using one of the distance techniques listed in Table 26.2 and it turns out to be 200 million light-years. The galaxy’s redshift tells us its recessional velocity is 5000 km/s. What is the Hubble constant?arrow_forwardSuppose you were Hubble and Humason, working on the distances and Doppler shifts of the galaxies. What sorts of things would you have to do to convince yourself (and others) that the relationship you were seeing between the two quantities was a real feature of the behavior of the universe? (For example, would data from two galaxies be enough to demonstrate Hubble’s law? Would data from just the nearest galaxies-in what astronomers call “the Local Group”-suffice?)arrow_forwardBased on your analysis of galaxies in Table 26.1, is there a correlation between the population of stars and the quantity of gas or dust? Explain why this might be.arrow_forward
- A galaxy is observed to recede at speed 140 km/s. If the Hubble constant is 70 km/s/ Mpc, how far is the galaxy?arrow_forwardA certain galaxy is observed to be receding from the Sun at a rate of 8000 km/sec. The distance to this Galaxy is measured independently and found to be 1.4 x 10 to the eighth power pc. Using this data, what is the value of the Hubble constant ?arrow_forwardWhat is the redshift z of a galaxy 193 Mpc away from us? Note: Assume a value of the Hubble constant of 71.1 km/s/Mpcarrow_forward
- Recall that Hubbleʹs law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubbleʹs constant. Suppose H0 = 80 km/s/Mpc. How fast would a galaxy located 800 megaparsecs distant be receding from us?arrow_forwardA galaxy's distance from us is measured to be 49 Mpc. Using the same value of the Hubble constant, 70 kilometers per second per Mpc, calculate the galaxy's velocity as viewed by us.arrow_forwardA galaxy's velocity is measured to be 3112 kilometers per second away from us. What is the distance from us to that galaxy, in units of Megaparsecs (Mpc)? If the value of the Hubble constant is 70 kilometers per second per Mpc.arrow_forward
- Explain how the Hubble constant, H0, can be used to make an estimate for the age of the Universe. Use the value of H0 = 0.07×103 kms-1/Mpc to estimate the Universe’s age. Comment on the significance of your answer.arrow_forwardThe galaxy NGC 87 has been observed to be moving away from Earth at a speed of 3,420 km/s.Using a value of 20.8 km/s/Mly for the value of the Hubble constant, find the distance between NGC 87 and Earth. Give your answer to the nearest Mpc.arrow_forwardSuppose 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.arrow_forward
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