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Seyfert galaxy

en.wikipedia.org/wiki/Seyfert_galaxy

Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars. ... In 1943, Carl Keenan Seyfert discovered more galaxies similar to NGC 1068 and reported that ... At the ...

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physics.unm.edu/Courses/Brandt/TEST04.html

The universe started expanding at some time in the past; the universe has an age . b. ..... That some spirals have unusually luminous nuclei was discovered by: a.

Chapter 17 - Astronomy

physicalscience.jbpub.com/starlinks/7e/docs/CH17_outline_updated.doc

More recently, astronomers have discovered objects that fit none of Hubble's ... spiral arms come from the ends of a bar through the nucleus rather than from the nucleus itself. 4. ... Collisions between galaxies are not unusual because on average galaxies ..... An active galaxy is a galaxy with an unusually luminous nucleus.

Behemoth Black Hole Found in an Unlikely Place | NASA

www.nasa.gov/feature/goddard/2016/behemoth-black-hole-found-in-an-unlikely-place

Apr 6, 2016 ... Astronomers have uncovered a near-record breaking supermassive black hole, ... “The newly discovered supersized black hole resides in the center of a ..... Occasionally, some primordial black holes will pass close enough to be ... face- on spiral galaxy NGC 6814, whose luminous nucleus and spectacular ...

Active galactic nuclei - D.E. Osterbrock - NED

ned.ipac.caltech.edu/level5/Osterbrock3/Oster6.html

Many of the most luminous radio galaxies are morphologically classified as ... In many cases these spectra are earlier in spectral type than normal spirals, ... Only one `Seyfert 2 QSO' has been reported, E 0449-184, originally discovered as .... definition of a very low-luminosity Seyfert 1.8 nucleus with unusually narrow lines .

Hubble Finds Misbehaving Spiral | NASA

www.nasa.gov/image-feature/goddard/2016/hubble-finds-misbehaving-spiral

Jan 29, 2016 ... However, in an unexpected discovery, astronomers found LO95 ... This growing class of unusual spirals continues to raise significant ... This is demonstrated by the striking face-on spiral galaxy NGC 6814, whose luminous nucleus and ... NGC 6814 has an extremely bright nucleus, a telltale sign that the ...

Introduction - Discovery of Active Galactic Nuclei - University of ...

www.astr.ua.edu/keel/agn/text.html

In the type 1 nuclei, certain emission lines were much broader - the ones that could originate ... The discovery of quasars has been recounted often. ... had to be much more luminous than any ordinary galaxies - hundreds of times brighter. ... Some quasars with unusually weak emission lines share some of these variability ...

Galaxies - Astronomy Notes

www.astronomynotes.com/galaxy/s12.htm

Jun 2, 2007 ... When the universe was younger, some galaxies produced a lot ... A peculiar group of galaxies are extremely luminous but very compact. ... an ``active galaxy'' to be a galaxy with a very luminous nucleus. ... Later, some other blue star-like objects at large redshifts were discovered to have no radio emission ...

Footprints of an active galactic nucleus - The nuclear zone of NGC ...

adsabs.harvard.edu/full/1985AJ.....90..197B

I. INTRODUCTION Since the discovery ofactive galactic nuclei, observational ... The synthesis of earlier work plus some unpublished emission-line images ... 1 kpc*) ofthe nucleus of NGC 1068 that are unusual for a galaxy of the same (Sb) Hubble type. ... (1983), among others, have mapped the radio continuum at a variety ...

A galaxy with two hearts - Phys.org

phys.org/news/2014-01-galaxy-hearts.html

Jan 9, 2014 ... This new Hubble image shows the spiral galaxy Messier 83, otherwise ... number of supernova explosions, and is thought to have a double nucleus lurking at its core. ... Located some 15 million light-years away in the constellation of Hydra ... However, Messier 83's centre is mysterious and unusual; the ...

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Active Galaxies - Teach Astronomy

m.teachastronomy.com

The placid exteriors of some galaxies conceal events of great violence. ... The most luminous of these objects give off the same amount of energy as 1 trillion suns. ... can get pulled in (just like a comet getting pulled into the sun), but as it spirals to ... discovered in 1908 by Edward Fath, who discovered intense emission lines ...

galaxy - Types of galaxies | astronomy | Britannica.com

www.britannica.com

Apr 13, 2016 ... Some of the features of this revised scheme are subject to argument because of ... do in fact have small numbers of luminous O and B stars as well as dust lanes. ... The normal spirals have arms that emanate from the nucleus, while barred ..... It was discovered that galaxies and galaxy clusters tend to fall in ...

Fermi Telescope Finds Giant Structure in our Galaxy | NASA

www.nasa.gov

Nov 9, 2010 ... A giant gamma-ray structure was discovered by processing Fermi all-sky ... WASHINGTON - NASA's Fermi Gamma-ray Space Telescope has .... This is demonstrated by the striking face-on spiral galaxy NGC 6814, whose luminous nucleus .... As it approaches the black hole, some of the material becomes ...