Galaxies/Collisions
Active Galaxies have ___ luminosities than Normal Galaxies.
Higher
What two properties are essential to measure the rotation curve of a celestial object?
Orbital speed and distance from the center
Objects moving toward us are shifted how?
Blue shift
What are the factors used to measure rotation curves?
Speed of the object against their distance from the center
What percent of galaxies are colliding at any given moment?
5%
Rotation curves can only be used for what type of galaxy?
Spiral Galaxy
Objects moving away from us are shifted how?
Red shift
What graph describes the rotation curve of a rigid rotating disk (pizza)?
Exponentially increasing in a straight line
Star formation does what during a galaxy collision?
Increases
Orbital speeds mostly depend on what property.
The mass within their orbit
How is Red light different than blue light?
Longer wavelength
What graph describes the rotation curve of a planet?
Slowing down as distance furthers
Galaxies today are ____ than they were in the past.
Bigger
The rotation curve of a galaxy is different than what we expect because of what?
Dark matter in the outer halos
What galaxies have larger redshifts?
Farther away galaxies
What graph describes the rotation curve of a galaxy?
Maintaining high velocity as the distance furthers
Why is collision important to galaxies? (Hint: There are 4)
Increased star formation, nuclear activity (quasars), creation of elliptical galaxies, and "feeding" the center of active galaxies?
Unlike the rotation curve of this, a galaxy's rotation curve is flat.
Solar system
What concept links the redshift of galaxies and their distance?
Hubble’s law
Why do galaxies maintain high velocity as distance furthers?
The presence of dark matter?