EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 44, Problem 20P
To determine
The Schwarzschild radius for a typical galaxy.
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(4) The redshift for Galaxy Y is 6.61e-3. What is the galaxy’s velocity (in km/s)?
(just enter the #
3) (a) How fast and in what direction must galaxy A be moving if an absorp-
tion line found at wavelength 550nm (green) for a stationary galaxy is shifted
to 450 nm (blue) (a "blue-shift") for galaxy A?
(b) How fast and in what direction is galaxy B moving if it shows the same line
shifted to 700 nm (red) (a "red shift")?
for 14 i observed the galaxy end aroung 5 kpc.
I need help with 18
Chapter 44 Solutions
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- Suppose that a galaxy has 109 M⊙ of neutral HI gas with a temperature of about 10 K. Estimate the luminosity of the 21 cm wavelength radiation that is expected from the galaxy. Answer in watts.arrow_forward*39 Will the universe continue to expand forever? To attack this question, assume that the theory of dark energy is in error and that the recessional speed v of a galaxy a distance r from us is determined only by the gravitational interaction of the matter that lies inside a sphere of radius r centered on us. If the total mass inside this sphere is M, the escape speed v, from the sphere is v. = V2GMIT (Eq. 13-28). (a) Show that to prevent unlimited expansion, the aver- age density p inside the sphere must be at least equal to ЗН 87G (b) Evaluate this "critical density" numerically; express your an- swer in terms of hydrogen atoms per cubic meter. Measurements of the actual density are difficult and are complicated by the pres- ence of dark matter.arrow_forward5) The recessional velocity of a galaxy is found to be 0.52c. Calculate the redshift. (2arrow_forward
- It can be shown that if an object orbiting a star of mass M in a circular orbit of radius R has speed v, then Rv? M Suppose a star orbits the center of the galaxy it is contained in with an orbit that is nearly circular with radius 18 R = 2.5 x 10 and velocity v = 230 km/s. Use the result above to estimate the mass of the portion of the galaxy inside the star's orbit (place all of this mass at the center of the orbit). Mass =arrow_forwardA galaxy is found to be receding at a velocity of 3.0 x 104 km-s-1. Calculate the distance to the galaxy.arrow_forwardhelparrow_forward
- Does an elliptical galaxy rotate like a spiral galaxy? Explain.arrow_forwardWhen comparing two isolated spiral galaxies that have the same apparent brightness, but rotate at different rates, what can you say about their relative luminosity?arrow_forwardCan an elliptical galaxy evolve into a spiral? Explain your answer. Can a spiral turn into an elliptical? How?arrow_forward
- Why can we not determine distances to galaxies by the same method used to measure the parallaxes of stars?arrow_forward8) Calculate the velocity of a galaxy with a redshift of 0.37.arrow_forward21) If the Hubble's constant for a universe is 25 km/s/Mly. Calculate the distance to a galaxy that has recession velocity of 4.0 x 105 km/s.arrow_forward
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