Active and Normal Galaxies

Which of the following is a property of a quasar?

• Quasars lie relatively close to us.

• Quasars produce only stellar radiation.

• Quasars are the brightest known objects in the universe.

• Quasars - nuclear reactions at core - produce radio waves.

Which of the following is not a characteristic of active galaxies?

• very high luminosities

• no internal motion

• non stellar energy emission

• jets and other signs of explosive activity

Which of the following are radio galaxies?

• lobe and core halo

• core halo and quasar

• Seyfert and lobe

• Seyfert and core halo

Which of the following is not a characteristic of a Seyfert galaxy?

• Looks like normal spiral galaxy

• Invisible shorter radio and infrared radiation

• 10,000 X dimmer than normal galaxies

• Substantially redshifted

Which of the following is a characteristic of lobe-radio galaxy?

• radiation does not come from the core

• lobes might be material ejected from center of galaxy

• the lobes are 1000 times larger than the milky way galaxy

• energy comes from lobes

Which of the following is not a property of core-halo galaxies?

• stronger emission coming from an extended halo

• energy emitted from an extremely small central nucleus

• halo is 50 kpc across

• the core is 1 pc across

Most energy from a Seyfert galaxy stems from a small central region known as

• quasars

• spiral arms

• nuclear blob

• galactic nucleus

Seyfert galaxies look most like

• elliptical galaxies

• irregular galaxies

• spiral galaxies

• peculiar galaxies

What is the likely difference between the lobe-radio and the core-halo galaxies?

• the view

• the lobe-radio is 100 times brighter than the core-halo

• the core-halo galaxies is more energetic

• the lobe-radio is more dense at the core.

Quasars move at

• the speed of light

• 1/3 the speed of light

• very slow speeds

• right angles to the other galaxies

Tags

NGSS.HS-PS2-1