Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 27, Problem 23E
In the chapter, we discussed that the largest redshifts found so far are greater than 6. Suppose we find a quasar with a redshift of 6.1. With what fraction of the
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The most distant quasar is "J0313-1806". Its
redshift is z = 7.64.
[ z = (femitted - fobserved)/ fobserved]
Assume that the redshift is due to relative
motion. Then how fast is the quasar moving
away from Earth?
(speed as the fraction of c = )
| .704
According to Hubble's Law, the distance (r)
depends on the speed of recession (v)
according to v = Hor where Ho~
20km/s
Mly
How many years are required for light to
travel from the quasar to Earth?
(years = )
Is a quasar with a redshift of z = 2 going faster than the speed of light? Why or why not?
3C 273 was the first quasar identified (1963). When we look at its chemical spectrum, we see that its hydrogen alpha emission line (Hα) has an observed wavelength of λobs = 759 nm.-(By comparing the observed wavelength of Hα with the rest-frame (source) wavelength, find 3C 273’s redshift, z.- How fast is 3C 273 moving away from us in km/s?-Assuming the value of Hubble constant listed in the table at the top of the page, how far away is 3C 273 in Mpc? This was, at the time, the most distant object in the known universe!answer to three significant figures
Chapter 27 Solutions
Astronomy
Ch. 27 - Describe some differences between quasars and...Ch. 27 - Describe the arguments supporting the idea that...Ch. 27 - In what ways are active galaxies like quasars but...Ch. 27 - Why could the concentration of matter at the...Ch. 27 - Describe the process by which the action of a...Ch. 27 - Describe the observations that convinced...Ch. 27 - Why do astronomers believe that quasars represent...Ch. 27 - Why were quasars and active galaxies not initially...Ch. 27 - What do we now understand to be the primary...Ch. 27 - What is the typical structure we observe in a...
Ch. 27 - What evidence do we have that the luminous central...Ch. 27 - Suppose you observe a star-like object in the sky....Ch. 27 - Why don’t any of the methods for establishing...Ch. 27 - One of the early hypotheses to explain the high...Ch. 27 - A friend of yours who has watched many Star Trek...Ch. 27 - Could the Milky Way ever become an active galaxy?...Ch. 27 - Why are quasars generally so much more luminous...Ch. 27 - Suppose we detect a powerful radio source with a...Ch. 27 - A friend tries to convince you that she can easily...Ch. 27 - Show that no matter how big a redshift (z) we...Ch. 27 - If a quasar has a redshift of 3.3, at what...Ch. 27 - If a quasar is moving away from us at v/c=0.8 ,...Ch. 27 - In the chapter, we discussed that the largest...Ch. 27 - Rapid variability in quasars indicates that the...Ch. 27 - Large redshifts move the positions of spectral...Ch. 27 - Once again in this chapter, we see the use of...Ch. 27 - In the Check Your Learning section of Example...Ch. 27 - In the Check Your Learning section of Example...Ch. 27 - The quasar that appears the brightest in our sky,...
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- If a quasar is moving away from us at v/c=0.8 , what is the measured redshift?arrow_forwardDescribe the arguments supporting the idea that quasars are at the distances indicated by their redshifts.arrow_forwardIf a quasar has a redshift of 3.3, at what fraction of the speed of light is it moving away from us?arrow_forward
- What evidence do we have that the luminous central region of a quasar is small and compact?arrow_forwardShow that no matter how big a redshift (z) we measure, v/c will never be greater than 1. (In other words, no galaxy we observe can be moving away faster than the speed of light.)arrow_forwardThe Lyman alpha line (Kα) of hydrogen is measured in the laboratory to have a wavelength of 121.6 nm. In the quasar PKS 2000-330 the same line is determined to have a wavelength of 580.0 nm. What is its redshift and recession velocity?arrow_forward
- What is the Eddington luminosity of a quasar with a mass of 1 billion Msun ?arrow_forwardSuppose a universe is spatially flat, and (at some moment in time) has density ρ. Suppose a creature living in one galaxy in this universe sees a second galaxy receding (at this same moment in time), with its spectral lines redshifted by a factor of z. How far away is the second galaxy from the first? (Note the distance is small enough that Hubble's law can be safely applied.) Values: ρ = 5x10-27 kg m-3 z = 0.10 Enter your answer in Mpc, rounded to the nearest integer.arrow_forwardObservations of quasars have shown us that many are extremely _________, emitting more energy than all the stars in a galaxy. The energy they give off comes from a very small volume, typically about the size of ___________. Some have long ______, shooting off in opposite directions. Today, astronomers understand that all the properties of quasars can be explained if they are __________ at the centers of galaxies. Astronomers can use _____________ to study images and spectra of the central regions of galaxies more clearly than earlier instruments.arrow_forward
- Suppose a distant quasar has a redshift of 6. At what fraction of the speed of light is the quasar moving away? z = Δλ/λ = v/carrow_forwardIf a galaxy is 9.0 Mpc away from Earth and recedes at 510 km/s, what is H? What is the Hubble time?arrow_forwardThe largest known redshift attributed to a specifi c molecule is z = 6.42 from the CO molecule in the quasar SDSS J1148+5251. Find the quasar’s distance from us and recession speed relative to usarrow_forward
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