What is the energy source for active galaxies?
The energy source of active galaxies is the steady accretion of matter onto a supermassive Black Hole. Gas settles into an accretion disk. The hot inner parts of the disk shine brightly, especially at X-rays.
How is the extra energy of an active galaxy like a quasar produced?
The generally accepted explanation for the observed properties of active galaxies is that the energy is generated by accretion of galactic gas onto a supermassive (billion—solar mass) black hole lying at the center of the nucleus.
Which of the following gives the two main assumptions of theoretical models of galaxy evolution?
Which of the following gives the two main assumptions of theoretical models of galaxy evolution? Hydrogen and helium filled all of space, and certain regions of the universe were slightly denser than others. Which of the following types of protogalactic clouds is most likely to form an elliptical galaxy?
How are they related to other active galactic nuclei?
How are they related to other active galactic nuclei? Other active galactic nuclei are not as luminous as quasars. But all active galactic nuclei are thought to be powered by accretion onto supermassive black holes. … Masses of supermassive black holes are proportional to the masses of the bulge components.
What is a blazar galaxy?
Blazars, a type of galaxy powered by a ginormous black hole and among the brightest, most energetic objects in the sky, are not unfamiliar to science. … They belong to a class of galaxies known as “active galactic nuclei” or AGNs, a reference to the supermassive black holes that power them.
What are the three main types of active galaxies?
There may be at least three types of active galaxies, including Seyfert galaxies, quasars, and blazars (although they may be the same type of galaxy view from different distances and perspectives). A Seyfert galaxy is an active spiral galaxy.
What is the most powerful thing in the universe?
These explosions generate beams of high-energy radiation, called gamma-ray bursts (GRBs), which are considered by astronomers to be the most powerful thing in the universe.
What is the brightest thing in the universe?
The brightest object in the universe has been discovered, a quasar from when the universe was just 7 percent of its current age. The quasar, now known as PSO J352. 4034-15.3373 (P352-15 for short), was discovered 13 billion light-years away from Earth by the Very Long Baseline Array (VLBA) radio telescope.
What is the brightest light in the universe?
The brightest light in the Universe
- The gamma ray burst (GRB), now known as GRB 190114C, was detected on 14 January this year by two space satellites: the Neil Gehrels Swift Observatory and the Fermi Gamma-ray Space Telescope.
- Its significance has now been confirmed by more than 300 international scientists and reported in the journal Nature.
What kind of object do we think lies in the center of the Milky Way galaxy?
We live in the Milky Way Galaxy, which is a collection of stars, gas, dust, and a supermassive black hole at it’s very center. Our Galaxy is a spiral galaxy, which are rotating structures that are flat (disk-like) like a DVD when looked upon edge-on.
What are the starting assumptions for models of galaxy formation?
The starting assumptions used for models of galaxy formation are that the universe was initially filled more or less uniformly with hydrogen and helium gas and that some regions of this gas were slightly denser than others.
Why do spiral galaxy mergers often trigger starbursts?
Answer: Starburst galaxies are filled with star-forming molecular clouds, which contain dust grains that absorb most of the visible light produced by the young stars. … 4) Why do spiral galaxy mergers often trigger starbursts? Answer: The dusty molecular clouds in spiral galaxies collide during a merger.
What causes active galactic nuclei?
Many galaxies have very bright nuclei, so bright that the central region can be more luminous than the remaining galaxy light. These nuclei are called active galactic nuclei, or AGN for short. … These narrow lines are due to low density gas clouds at larger distances (than the broad line clouds) from the nucleus.
Does the Milky Way have an active galactic nucleus?
Seyfert galaxies and quasars are galaxies with an active galactic nucleus. Most large galaxies have a supermassive black hole at their centres. … The Milky Way currently doesn’t have an active nucleus. It may have been active in the past when the galaxy was younger.