What does a zero, negative and positive line-of-sight velocity dispersion for galaxies mean (physical interpretation)?
What does a zero, negative and positive line-of-sight velocity dispersion for galaxies mean (physical interpretation)?
Homework Answers
A zero line of sight velocity dispersion means that the galaxy follows strict circular rotation, that is it doesn't deviate from the calculated mean velocity of the galaxy or the galaxy cluster.
A negative velocity dispersion however means that the galaxies are retarding that is they are deviating away from the observed mean velocities. The galaxies or the galaxy clusters are slowing down.
A positive line of sight velocity distribution refers to the rapid movement of galaxies or clusters of galaxies. These galaxies are more nearer to ours, and a moving at a much faster rate as compared to the mean distribution of galaxies.
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What does a zero, negative and positive line-of-sight velocity
dispersion for galaxies mean (physical interpretation)?
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what does a negative value of displacement and velocity represent when compared to positive values?
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5. The velocity of a projectile at its highest point is always b Positive a Negative...
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3. The observed recession velocity of a galaxy is the sum of its Hubble flow velocity,...
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if you plotted your velocity vs time would the slope be negative, positive or zero? why?...
if you plotted your velocity vs time would the slope be negative,
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The observed recession velocity of a galaxy is the sum of its Hubble flow velocity, vH...
The observed recession velocity of a galaxy is the sum of its Hubble flow velocity, vH = H0d, and the line-of-sight (LOS) component of its peculiar velocity, vp, due to local gravitational effects. a) Suppose we measure H0 by measuring the distance and redshift for a single galaxy. Write an expression for how the error in our measurement depends on the peculiar velocity of the galaxy? b) At what distance can we measure H0 to 5%? Assume the true value...
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3. Tremaine et al. (2002) have shown that supermassive black holes in the nuclei of galaxies follow a relation between black hole mass, MB, and the velocity dispersion of the host galaxy bulge component, σ, such that log,o MBH8.0+40logo 200km/ The gravitational radius, Ra. (in a sense the "sphere of influence") of a black hole can be defined by the distance from the center at which the orbital speed of a star due to the black hole alone (i.e. neglecting...
Zero Negative Positive correct Question 8 011 pts Velocity vs. Time Velocity (meters/second) 16 24 32 40 48 5 Time (seconds) What is the magnitude of the displacement between t = 16.0 and t = 34.0 seconds (in meters)? Do not include units in your answer. 6-0
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5. The velocity of a projectile at its highest point is always b Positive a Negative c Zero d Equal to the initial velocity 6. If a projectile is launched with an initial velocity of 20 m/s from a height of 50 m in the direction 60° east of north, how long does it take the projectile to return to its original height? 彐 7. Peterson traveled 5 m due west, and then another 5 m due north. From his...
3. The observed recession velocity of a galaxy is the sum of its Hubble flow velocity, UH = Hod, and the line-of-sight (LOS) component of its peculiar velocity, vp, due to local gravitational effects. a) Suppose we measure Ho by measuring the distance and redshift for a single galaxy velocity of the galaxy?10 b) At what distance can we measure Ho to 5%? Assume the true value of Ho is 74 kin s-"Mpc-1 and a typical LOS peculiar velocity is...
if you plotted your velocity vs time would the slope be negative,
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llould be a div ed Distance from start Time to get there 5 m 10 m 15 m 12.05 20 m 15
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