UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 25, Problem 1CLC
To determine
The redshift z-value of galaxy that has a shifted galaxy spectral line of
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What is the redshift z of a galaxy 186 Mpc away from us?
Note: Assume a value of the Hubble constant of 70.0 km/s/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.
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?
Chapter 25 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
Ch. 25 - Prob. 1CCCh. 25 - Prob. 2CCCh. 25 - Prob. 3CCCh. 25 - Prob. 4CCCh. 25 - Prob. 5CCCh. 25 - Prob. 6CCCh. 25 - Prob. 7CCCh. 25 - Prob. 8CCCh. 25 - Prob. 9CCCh. 25 - Prob. 10CC
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- If a quasar is moving away from us at v/c=0.8 , what is the measured redshift?arrow_forwardThe classical Doppler shift for light. A light source recedes from an observer with a speed v that is small compared with c. (a) Show that in this case, Equation 1.15 reduces to ffvc (b) Also show that in this case vc (Hint: Differentiate f = c to show that / = f/f) (c) Spectroscopic measurements of an absorption line normally found at = 397 nm reveal a redshift of 20 nm for light coming from a galaxy in Ursa Major. What is the recessional speed of this galaxy?arrow_forwardwhy are the shells visible around some elliptical galaxies significant?arrow_forward
- 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)?arrow_forwardCompute the gravitational energy of a pair of colliding galaxies , each of mass 10 Mo separated by a distance of 10 kpc and compare it with the energy requirements of a powerful radio source . What conclusion do you arrive at from such a comparisonarrow_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
- By what factor would the critical density of the universe today change if the Hubble constant today measured at 5 times greater than what we previously thought?arrow_forwardIf a galaxy moving away from the Earth has a speed of 1000 km/s and emits 656 nm light characteristic of hydrogen (the most common element in the universe). Why is the speed of the Earth in its orbit negligible here?arrow_forwardA certain galaxy is observed to be receding from the Sun at a rate of 8000 km/sec. The distance to this Galaxy I measured independently and found to be 1.4 x 10 to the eighth power pc. Using these data , what is the value of the Hubble constant ?arrow_forward
- If the active core of a galaxy contains a black hole of 106 MSun , what will the orbital distance be (in km) for matter orbiting the black hole with an orbital period of 1 hour?arrow_forwardWhat speed should a galaxy move with respect to us so that the sodium line at 589.0 nm is observed at 589.6 nm?arrow_forwardDistances to local galaxies are determined by measuring the brightness of stars, called Cepheid variables, that can beobserved individually and that have absolute brightnesses at a standard distance that are well known. Explain how the measuredbrightness would vary with distance as compared with the absolute brightness.arrow_forward
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