Seyfert

Seyferts were first classified as Type 1 or 2, depending upon whether the spectra show both narrow and broad emission lines, or only narrow lines.

Seyfert 2 Galaxy Active galaxies which are brightest at infrared wavelengths. They show narrow lines and appear to be cool and dusty. Active Galactic Nucleus, Seyfert 1 Galaxy ...

Seyfert's Sextet Colliding Galaxies Y'know, if you login, you can write something here. You can also Create a New User if you don't already have an account.

Definition: Seyfert galaxy: A spiral galaxy whose nucleus shows bright emission lines; one of a class of galaxies first described by C. Seyfert. Space Tragedies9 Planets in Nine DaysAstronomy 101 Related Articles ...

Seyfert galaxies are usually spiral galaxies whose nuclei are exceptionally bright. A few percent of spiral galaxies contain a Seyfert nucleus.

Seyfert galaxies are, almost by definition, mostly in spirals and S0s (Simkin et al 1980 ApJ 237, 404; Heckman 1980 PASP 90, 241; Adams 1977 ApJSuppl 33, 19). Companions and distortions are often present (see p. 83).

Seyfert galaxies. Seyferts were the earliest distinct class of AGN to be identified.

Seyferts Consider NGC 4151, a spiral galaxy 15 Mpc away. Photographs by Carl Seyfert in the 1940s showed a very bright point-like nucleus.

Seyfert's Sextet (NGC6027) in Serpens (RA 15h 59.2m , Dec. +20°45', 15 mag., 2 x 1 arcmin.) This compact group of interacting galaxies is located 1°50' E of r Serpentis (see finder chart below).

Seyfert galaxy - (n.) A type of spiral galaxy that has a bright nucleus and whose spectrum shows emission lines.

Seyfert galaxy Type of active galaxy that exhibits intense energetic activity from a small region within the nucleus of an otherwise normal-looking spiral galaxy.

Seyfert galaxy reflection nebulae globular cluster globular cluster Bode's Galaxy (123 kb) (4.5 Mb!) (138 kb) (197 kb) (975 kb) Messier 82 Messier 83 Messier 84 Messier 85 Messier 86 ...

SEYFERT GALAXY A Seyfert galaxy is an active spiral galaxy. Its nucleus (center) has bright emission lines, including visible wavelengths. The brightness varies over relatively short time periods (less than a year).

Seyfert Galaxy A galaxy characterized by a moderately bright, compact active galactic nucleus, presumably powered by a black hole. Shock Wave ...

Seyfert galaxies Galaxies with small bright centers. Many Seyfert galaxies are good sources of radio waves. Shooting star ...

Seyfert Galaxy (a) A type of spiral galaxy first discovered by Karl Seyfert in the 1940s. The central region of a Seyfert galaxy is distinguished by powerful radiation, much of it focused into narrow frequencies.

Seyfert Galaxy: A galaxy that appears to be a normal spiral galaxy, but whose core fluctuates in brightness. It is believed that these fluctuations are caused by powerful eruptions in the core of the galaxy.

Seyfert galaxy- a galaxy that has a small, bright nucleus and faint spiral arms; it is often a strong radio source Shepherd moon- a satellite which constrains the extent of a planetary ring through gravitational forces ...

Seyfert Galaxy A main-sequence star which rotates rapidly, causing a loss of matter to an ever-expanding shell. Shell Star A satellite which constrains the extent of a planetary ring through gravitational forces. Also known as a shepherd moon.

Seyfert's Sextet is an example of a compact galaxy group. Most galaxies in the universe are gravitationally bound to a number of other galaxies.

Seyfert Galaxy An otherwise normal spiral galaxy with an unusually bright, small core that fluctuates in brightness; believed to indicate the core is erupting. Shear (S) Waves ...

Seyfert Galaxy: Seyferts are spirals galaxies that have bright starlike cores. Seyferts have strong emission lines, and the emission lines are very broad, implying velocities from 500 to 4000 km/sec.

Seyfert galaxies. A kind of so-called 'active' galaxy. Seyfert galaxies have fairly small but bright nuclei and weak spiral arms. These galaxies are also strong emitters of radio wave energy.

Seyfert galaxy -- variety of active galaxy with a small, abnormally bright nucleus containing hot gas. Named for the astronomer Carl Seyfert, who first drew attention to these objects.

Seyfert Galaxy - A barred or normal spiral galaxy with a small, very bright nucleus SETI - The search for extraterrestrial intelligence ...

The Seyfert galaxy NGC 1566. The energy of Seyfert galaxy nuclei fluctuates quickly like the quasar fluctuations, so the energy generator must be quite small.

Some Seyfert galaxies, called Type 1, seem to give us a clear view right down to the nucleus: ...

Galaxia Seyfert, NGC 1566. (Cortesía del Observatorio Anglo-Australiano/Observatorio Real de Edimburgo) (69K GIF) Galaxia espiral Barred, NGC 1365. (Cortesía del Observatorio Anglo-Australiano/Observatorio Real de Edimburgo) (97K GIF) ...

Carl K. Seyfert 1911-1960 American discovered the first active galaxy, part of a group now called Seyfert galaxies ...

Seyfert galaxies (High Energy Astrophysics Dictionary- GSFC) A spiral galaxy whose nucleus shows bright emission lines; one of a class of galaxies first described by C. Seyfert. sferics (NASA SP-7, 1965) 1. (Also spelled spherics ).

Three types of active galaxies are Seyfert Galaxies, quasars, and blazars. Many active galaxies are also radio galaxies. altitude The measurement, usually in degrees, of an object's apparent height above the horizon.

1943 - Carl Keenan Seyfert identifies six spiral galaxies with unusually broad emission lines, named Seyfert galaxies, 1949 - J.G. Bolton, G.J. Stanley, and O.B. Slee identify NGC 4486 (M87) and NGC 5128 as extragalactic radio sources, ...

AGN are found at the heart of active galaxies, including quasars, Seyfert galaxies, blazars, and radio galaxies. In addition to their great energy output, they can be highly variable.

It is called a Seyfert galaxy. A Seyfert galaxy has an active nucleus - notice how bright its central bulge is. It is believed that gas from one galaxy is being swallowed by a giant black hole at the center of the other galaxy.

M77 (NGC 1068) is a small spiral galaxy seen face on, one of the so-called Seyfert gallaxies, which means it has a radio source - a feeble example of a quasar. M77 is about 50 million light years away, and is found one degree SE of delta Ceti.

Examples of recent images include the Stephan's Quintet and Seyfert's Sextet groups of galaxies (Hubble Space Telescope) and a vista, within our own Milky Way Galaxy, of the Cygnus Region ( Dominion Radio Astrophysical Observatory).

Double stars alpha Cet, gamma Cet Variable stars omicron Cet Nearby star tau Cet Spiralgalaxy M 77 (Seyfert-Galaxy), NGC 247 Planetary nebula NGC 246 Meteor Showers: October Cetids, Eta Cetids, Omicron Cetids ...

A galaxy that is emitting exceptionally large amounts of energy; a Seyfert galaxy, radio galaxy, or quasar. active optics ...

There may be at least three types of active galaxies, including Seyfert galaxies, , and blazars (although these three may be the same type of galaxy viewed from different distances and perspectives).

Gamma rays from outside the Milky Way have been found emanating from radio galaxies (galaxies whose radio emissions constitute an extraordinarily large amount of their total energy output), Seyfert galaxies (galaxies with extremely bright ...

See also: Galaxy, Galaxies, Light, Black Hole, Telescope