Seyfert type 1 galaxies are AGNs with the accretion disk tipped slightly from face-on. Seyfert type 2 galaxies are AGN accretion disks with an edge-on view. ... The gas in the disk is orbiting at high speeds and short-duration fluctuations in brightness limit the size of the object at the center of an AGN.
What is the difference between Type 1 and Type 2 Seyfert galaxies?
Explanation: A Seyfert galaxy is a spiral galaxy with an active nucleus. ... Type I Seyfert galaxies are very bright sources of visible and ultraviolet light and x-rays . Type II Seyfert galaxies are very bright sources of infra-red and visible light.
What is the most likely reason for the differences between type 1 and type 2 Seyfert galaxies?
What is the difference between Type 1 and Type 2 Seyfert galaxies? Type 1 Seyferts are very luminous at ultraviolet wavelengths and at X-ray wavelengths. Galaxies in close pairs are three times more likely to be Seyfert galaxies than are isolated galaxies.
What are Seyfert galaxies quizlet?
Seyfert galaxies are____ spiral galaxies with unusually luminous nuclei. Quasars are____. extremely luminous objects with high redshifts. The energy output of a Seyfert galaxy____.
What is the difference between Seyfert galaxies and quasars?
Quasars are brighter and more distant objects (that is, they are older) than Seyfert galaxies. Quasars are detected without observing the underlying galaxies, whereas Seyfert galaxies are detected both by the energetic core and by the entire galaxy radiation.
What is a Seyfert 2 galaxy?
Type II Seyfert galaxies have the characteristic bright core , as well as appearing bright when viewed at infrared wavelengths. Their spectra contain narrow lines associated with forbidden transitions, and broader lines associated with allowed strong dipole or intercombination transitions.
What is another name for Seyfert type 1 galaxies?
Type I AGN are also called Seyfert 1 galaxies or a Sy1s, ditto Sy2s). See e.g. Gene Smith’s UCSD page. Types I and II AGN: Type I refers to AGN whose nucleus is visible (the spectra has both narrow and broad emission lines), while in type II AGN, the broad line region (BLR) is obscured and the lines are very narrow.
What happens when two spiral galaxies collide?
A: When two spiral galaxies collide, gravity is the main force that comes into play . As the galaxies approach each other, gravitational forces start to pull the stars, gas, and dust of the spiral arms out of their original orbits. ... During the merger, the stars become scattered and their orbits become random.
What does quasars stand for?
Definition: Quasi Stellar radio sources , abbreviated QUASARS, are the most dynamic and far-off objects in a collective known as active galactic nuclei (AGN). These radiant sources were formed approximately twelve billion years ago.
What type of AGN is the brightest?
The brightest and most energetic type of AGN is a quasar . About 10 percent of AGNs have jets of material and radiation shooting out in the direction perpendicular to the accretion disk.
Which types of galaxies lack an ordered structure?
When including all the stars, gas, dust and dark matter, a spiral galaxy is around 1 trillion times the mass of the sun, Samuel said. Some of Samuel’s favorite galaxies, which she studies as part of her research, are dwarf galaxies . These are much less massive than spiral galaxies and lack their ordered structure.
Quasars are at the centers of active galaxies. How are galaxies and quasars related? The more massive the galaxy, the more massive the black hole . For galaxies with super-massive black holes at their centers, how does the mass of the host galaxy and the mass of the black hole relate?
Do the colours of galaxies seem related to their shapes? Explain. As a general rule, elliptical galaxies are yellowish , while spirals and irregulars look more bluish.
Is the Milky Way a Seyfert galaxy?
Our galaxy isn’t generally considered a Seyfert galaxy , or a particularly active galaxy at all. But the Milky Way is known to have a 4-million-solar-mass black hole at its heart, called Sagittarius A*, or Sgr A* (pronounced Sagittarius A-star).
Are seyferts quasars and blazars normal galaxies?
Quasars, blazars, Seyfert galaxies, and radio galaxies are all active galaxies . Active galaxies contain an accretion disk around a central black hole, with two perpendicular jets. An active galaxy’s appearance depends on the orientation of the accretion disk.
How common are Seyfert galaxies?
Like quasars, they are thought to be powered by massive black holes at their centres. About 1 percent of all spiral galaxies are thought to exhibit Seyfert properties, or perhaps all spiral galaxies are Seyferts 1 percent of the time.
