Wikipedia
Seyfert is a surname, and may refer to:
- Carl Keenan Seyfert (1911–1960), United States astronomer
- Gabriele Seyfert (born 1948), German athlete in figure skating
- J. Michael Seyfert (born 1959), German documentary filmmaker, photographer
- Johann Caspar Seyfert (1697–1767), German music composer
- Johann Gottfried Seyfert (1731–1772), German music composer, son of Johann Caspar Seyfert
- R. Tracy Seyfert (born 1941), United States political figure from Pennsylvania
Seyfert is a prominent lunar impact crater that is located on the far side of the Moon. It lies behind the eastern limb of the Moon, to the east of the crater Espin. Just to the north of Seyfert is the crater Harriot and equally close to the south is Polzunov.
The outer rim of this crater is slightly elongated to the north, and the northeastern rim is overlain by the satellite crater Seyfert A. This overlapping impact crater has a central ridge on its interior floor. There is a low ridge near the midpoint of Seyfert, but it is less prominent. The inner wall of Seyfert is wider along the northern edge, west of Seyfert A.
Several small craters lie along the rim and interior of Seyfert, including a merged group of small craters along the eastern inner wall, a small crater intruding into the southeastern rim, and a pair of small craters along the southern rim of Seyfert A. The interior floor of Seyfert is relatively level, and is marked by a number of tiny craterlets. Traces of the ray system from Giordano Bruno to the northwest lie along the rim and interior floor of Seyfert.
Usage examples of "seyfert".
Incidentally, the Seyfert galaxies resemble the quasars in many respects, including the fact that they both tend to show sizable variations in light and radio output.
American astronomer Karl Seyfert had discovered a class of energetic galaxies characterized by having a sharp, brilliant nucleus with an emission line spectrum signifying that large amounts of energy were being released there.
Arp found their association with quasar pairs to be so strong that it could almost be said to be a predictable attribute of Seyfert galaxies.
One of the most active nearby spiral galaxies, known by the catalog reference NGC4258, has a Seyfert nucleus from which the French astronomer G.
So the high redshift, quasarlike Seyfert ejected from the low redshift spiral was itself ejecting a pair of yet-higher-redshift sources, which turned out to be quasars.
X-ray images of the Seyfert galaxy NGC4151 show clearly proto-quasars forming in its nucleus prior to being ejected.
Arp found that on charts showing quasar positions, pairing the quasars by redshift almost always leads to finding a cataloged Seyfert close to the center point between them.
She also removed the obvious quasars and Seyfert galaxies that masqueraded as brown dwarfs in her survey.
She took to reading whenever she had time, about things like galactic structure and supernovae and Seyfert galaxies.
People who never heard of Henry Clark or Kyyra or Seyfert galaxies and could have lived out their lives happily keeping it that way.
When we started hopping home, he looked up everything the computer had on Seyfert galaxies, and he worried.
Maybe microuniverses, maybe distant Seyfert galaxies in our own universe.
The core of the hoax is the Core explosion: the lie that our galaxy is a Seyfert galaxy, that in twenty thousand years the wave of radiation will make all of known space uninhabitable, and most of the galaxy too.
Saving nascent intelligences had been forbidden since the Seyferts, the exploding galaxies.
The Seyferts in turn usually occur in matched pairs about some larger, still-lower-redshift galaxy from which they appear to have been originally ejected.