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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5) A black hole in the center of a nearby Galaxy has a Schwarzchild radius of 2.0*10^7 km. How many times more massive than Sagittarius A* (~4*10^6 solar masses) is said black hole ?
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")?
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.
Chapter 44 Solutions
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- 5) The recessional velocity of a galaxy is found to be 0.52c. Calculate the redshift. (2arrow_forwardIt 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_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_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_forwardA 0.75 m radio signal is detected from a galaxy as 2.0 m. Estimate the relative velocity.arrow_forward
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